{"id":762,"date":"2026-07-22T10:24:34","date_gmt":"2026-07-22T09:24:34","guid":{"rendered":"https:\/\/www.nutrixeal.fr\/expertise\/?p=762"},"modified":"2026-07-22T10:42:06","modified_gmt":"2026-07-22T09:42:06","slug":"carence-vitamine-b12-symptomes-causes-solutions","status":"publish","type":"post","link":"https:\/\/www.nutrixeal.fr\/expertise\/carence-vitamine-b12-symptomes-causes-solutions\/","title":{"rendered":"Quels sont les sympt\u00f4mes d&rsquo;une carence en vitamine B12 et comment la corriger&nbsp;?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La vitamine B12, ou cobalamine, joue un r\u00f4le vital dans le fonctionnement de notre organisme. Une carence en vitamine B12 peut entra\u00eener fatigue persistante, troubles neurologiques et an\u00e9mie. Nous vous proposons un tour d&rsquo;horizon complet pour reconna\u00eetre les signes, comprendre les causes et adopter les bonnes solutions au quotidien.<\/p>\n\n\n\r\n<section class=\"article-callout article-callout--summary panel summary-box\">\r\n\r\n    <div class=\"article-callout__header\">\r\n      <span class=\"article-callout__icon\" aria-hidden=\"true\">\r\n                  <svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\">\r\n            <path d=\"M3.5 10C3.5 6.22876 3.5 4.34315 4.7448 3.17157C5.98959 2 7.99306 2 12 2H12.7727C16.0339 2 17.6645 2 18.7969 2.79784C19.1214 3.02643 19.4094 3.29752 19.6523 3.60289C20.5 4.66867 20.5 6.20336 20.5 9.27273V11.8182C20.5 14.7814 20.5 16.2629 20.0311 17.4462C19.2772 19.3486 17.6829 20.8491 15.6616 21.5586C14.4044 22 12.8302 22 9.68182 22C7.88275 22 6.98322 22 6.26478 21.7478C5.10979 21.3424 4.19875 20.4849 3.76796 19.3979C3.5 18.7217 3.5 17.8751 3.5 16.1818V10Z\" stroke=\"#4FA729\" stroke-width=\"1.5\" stroke-linejoin=\"round\"\/>\r\n            <path d=\"M20.5 12C20.5 13.8409 19.0076 15.3333 17.1667 15.3333C16.5009 15.3333 15.716 15.2167 15.0686 15.3901C14.4935 15.5442 14.0442 15.9935 13.8901 16.5686C13.7167 17.216 13.8333 18.0009 13.8333 18.6667C13.8333 20.5076 12.3409 22 10.5 22\" stroke=\"#4FA729\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\r\n            <path d=\"M8 7H15\" stroke=\"#4FA729\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\r\n            <path d=\"M8 11H11\" stroke=\"#4FA729\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\r\n          <\/svg>\r\n                <\/span>\r\n\r\n      <p class=\"article-callout__title\">\r\n        En r\u00e9sum\u00e9      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"article-callout__content\">\r\n      \n<ul class=\"wp-block-list\">\n<li><strong>Signes pr\u00e9coces discrets<\/strong>&nbsp;: Fatigue persistante, faiblesse, essoufflement, p\u00e2leur ou vertiges peuvent r\u00e9v\u00e9ler une carence en vitamine B12.<\/li>\n\n\n\n<li><strong>Atteintes neurologiques<\/strong>&nbsp;: Fourmillements, troubles de m\u00e9moire, difficult\u00e9s de concentration ou d\u2019\u00e9quilibre peuvent appara\u00eetre, parfois sans an\u00e9mie associ\u00e9e.<\/li>\n\n\n\n<li><strong>Causes fr\u00e9quentes<\/strong>&nbsp;: R\u00e9gime v\u00e9g\u00e9talien, \u00e2ge avanc\u00e9, troubles digestifs, chirurgie bariatrique, metformine ou antiacides prolong\u00e9s augmentent le risque de d\u00e9ficit.<\/li>\n\n\n\n<li><strong>Diagnostic biologique<\/strong>&nbsp;: Le dosage sanguin de la B12 peut \u00eatre compl\u00e9t\u00e9 par l\u2019homocyst\u00e9ine ou l\u2019acide m\u00e9thylmalonique pour affiner l\u2019\u00e9valuation.<\/li>\n\n\n\n<li><strong>Correction adapt\u00e9e<\/strong>&nbsp;: La suppl\u00e9mentation peut \u00eatre orale ou intramusculaire selon l\u2019origine de la carence et la qualit\u00e9 de l\u2019absorption.<\/li>\n\n\n\n<li><strong>Pr\u00e9vention cibl\u00e9e<\/strong>&nbsp;: Produits animaux, aliments enrichis ou compl\u00e9ments permettent de maintenir les apports, surtout chez les profils \u00e0 risque.<\/li>\n<\/ul>\n    <\/div>\r\n\r\n<\/section>\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-909ff2f0\"><h2 class=\"uagb-heading-text\">Qu&rsquo;est-ce que la vitamine B12 et pourquoi est-elle essentielle&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La <a href=\"https:\/\/www.nutrixeal.fr\/509-vitamine-b12-methylcobalamine-et-adenosylcobalamine-vegan-formes-actives-en-pastilles.html\">vitamine B12<\/a>, \u00e9galement appel\u00e9e cobalamine, est une vitamine hydrosoluble indispensable au bon fonctionnement de l&rsquo;organisme.<sup>[1] <\/sup>Elle se distingue par sa structure complexe contenant un atome de cobalt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette vitamine n&rsquo;est synth\u00e9tis\u00e9e ni par les plantes ni par les animaux, mais uniquement par certains micro-organismes bact\u00e9riens.<sup>[2]<\/sup> Elle se retrouve n\u00e9anmoins surtout dans les produits d\u2019origine animale, car elle peut \u00eatre produite par la flore microbienne des animaux ou apport\u00e9e par leur alimentation, puis stock\u00e9e dans leurs tissus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La vitamine B12 contribue \u00e0 la formation normale de globules rouges, \u00e0 un m\u00e9tabolisme \u00e9nerg\u00e9tique normal et \u00e0 r\u00e9duire la fatigue. Elle participe \u00e9galement au fonctionnement normal du syst\u00e8me nerveux et au m\u00e9tabolisme normal de l&rsquo;homocyst\u00e9ine.<sup>[3]<\/sup> Ses r\u00e9serves, stock\u00e9es dans le foie, peuvent durer plusieurs ann\u00e9es chez un adulte en bonne sant\u00e9.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-6eede291\"><h2 class=\"uagb-heading-text\">Quelles sont les causes d&rsquo;une carence en vitamine B12&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-bef942a5\"><h3 class=\"uagb-heading-text\">Apport alimentaire insuffisant&nbsp;: le cas des r\u00e9gimes v\u00e9g\u00e9tariens et v\u00e9g\u00e9taliens<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les sources alimentaires de vitamine B12 sont quasi exclusivement d&rsquo;origine animale. La viande, les abats, les poissons, les \u0153ufs et les produits laitiers en constituent les principales sources.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;alimentation 100 % v\u00e9g\u00e9tale n&rsquo;apporte donc pas de vitamine B12 sous forme bioactive.<sup>[1]<\/sup> Les algues comme la spiruline ou la chlorelle contiennent des analogues non assimilables par l&rsquo;organisme humain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les personnes suivant un r\u00e9gime v\u00e9g\u00e9talien strict s&rsquo;exposent ainsi \u00e0 un risque accru de d\u00e9ficit. Les femmes enceintes ou allaitantes adoptant des alimentations v\u00e9g\u00e9taliennes doivent porter une attention particuli\u00e8re \u00e0 leur apport, tout comme les b\u00e9b\u00e9s nourris au sein par une m\u00e8re elle-m\u00eame carenc\u00e9e.<sup>[4]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-1c703dc7\"><h3 class=\"uagb-heading-text\">Probl\u00e8mes d&rsquo;absorption&nbsp;: quand l&rsquo;intestin ne fonctionne plus correctement<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;absorption de la vitamine B12 suit un parcours complexe au sein du tube digestif. Au niveau de l&rsquo;estomac, le facteur intrins\u00e8que, une prot\u00e9ine s\u00e9cr\u00e9t\u00e9e par les cellules pari\u00e9tales, se lie \u00e0 la vitamine pour permettre son passage \u00e0 travers la paroi de l&rsquo;intestin gr\u00eale.<sup>[5]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs troubles digestifs alt\u00e8rent l&rsquo;absorption de cette vitamine. La maladie de Biermer, une affection auto-immune, d\u00e9truit les cellules productrices du facteur intrins\u00e8que et provoque une an\u00e9mie pernicieuse.<sup>[5]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les maladies inflammatoires chroniques de l&rsquo;intestin, la maladie c\u0153liaque ou une chirurgie bariatrique r\u00e9duisent \u00e9galement l&rsquo;assimilation. Une infection \u00e0 Helicobacter pylori peut aussi diminuer l&rsquo;acidit\u00e9 gastrique n\u00e9cessaire \u00e0 la lib\u00e9ration de la B12 alimentaire.<sup>[6]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-99168800\"><h3 class=\"uagb-heading-text\">Facteurs de risque&nbsp;: \u00e2ge, m\u00e9dicaments et maladies associ\u00e9es<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Avec l&rsquo;avanc\u00e9e en \u00e2ge, la diminution de l&rsquo;acidit\u00e9 gastrique r\u00e9duit la lib\u00e9ration de la vitamine B12 contenue dans les aliments. Les personnes \u00e2g\u00e9es de plus de 65 ans pr\u00e9sentent ainsi un risque major\u00e9 de d\u00e9ficit.<sup>[6]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains m\u00e9dicaments interf\u00e8rent avec l&rsquo;absorption ou le m\u00e9tabolisme de cette vitamine. Les inhibiteurs de la pompe \u00e0 protons, prescrits contre les reflux gastriques, et la metformine, utilis\u00e9e chez les patients diab\u00e9tiques, figurent parmi les traitements les plus impliqu\u00e9s.<sup>[6]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des pathologies digestives comme la maladie de Crohn, la colite ulc\u00e9reuse ou une gastrectomie partielle augmentent \u00e9galement la probabilit\u00e9 d&rsquo;une carence. Une consommation excessive et chronique d&rsquo;alcool peut aussi perturber le m\u00e9tabolisme de la B12.<sup>[2]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-4aa8090e\"><h3 class=\"uagb-heading-text\">Troubles du stockage de la vitamine B12<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Le foie constitue le principal organe de stockage de la vitamine B12. En conditions normales, les r\u00e9serves h\u00e9patiques couvrent les besoins de l&rsquo;organisme pendant deux \u00e0 cinq ans.<sup>[7]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certaines maladies h\u00e9patiques chroniques perturbent cette capacit\u00e9 de stockage. Une cirrhose, une h\u00e9patite chronique ou une st\u00e9atose h\u00e9patique avanc\u00e9e peuvent compromettre les r\u00e9serves disponibles.<sup>[7]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des anomalies g\u00e9n\u00e9tiques rares affectent \u00e9galement le transport et le stockage de la cobalamine. Le d\u00e9ficit en transcobalamine II, par exemple, emp\u00eache la vitamine d&rsquo;atteindre correctement les cellules cibles. Ces situations n\u00e9cessitent une prise en charge sp\u00e9cialis\u00e9e et une suppl\u00e9mentation adapt\u00e9e \u00e0 long terme pour maintenir un taux suffisant.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fb58826e\"><h2 class=\"uagb-heading-text\">Comment identifier les sympt\u00f4mes d&rsquo;une carence en vitamine B12&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fe031a4c\"><h3 class=\"uagb-heading-text\">Signes pr\u00e9coces et g\u00e9n\u00e9raux&nbsp;: fatigue, maux de t\u00eate, teint p\u00e2le<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les premiers signes d&rsquo;une carence en B12 restent souvent discrets et peuvent passer inaper\u00e7us pendant des mois, voire des ann\u00e9es. La fatigue inexpliqu\u00e9e, la faiblesse musculaire et un essoufflement \u00e0 l&rsquo;effort constituent les manifestations initiales les plus fr\u00e9quentes.<sup>[8]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La p\u00e2leur du teint, parfois accompagn\u00e9e d&rsquo;une coloration l\u00e9g\u00e8rement jaun\u00e2tre, traduit un trouble de la formation des globules rouges. Des maux de t\u00eate r\u00e9currents et des vertiges peuvent \u00e9galement s&rsquo;installer progressivement.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une perte d&rsquo;app\u00e9tit ou une diminution involontaire du poids corporel peuvent accompagner ces premiers sympt\u00f4mes. Ces manifestations cliniques peu sp\u00e9cifiques rendent le diagnostic pr\u00e9coce d\u00e9licat sans bilan biologique adapt\u00e9.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fc34b5d0\"><h3 class=\"uagb-heading-text\">Manifestations neurologiques&nbsp;: troubles de la m\u00e9moire, paresth\u00e9sies, d\u00e9pression<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Le syst\u00e8me nerveux est particuli\u00e8rement sensible au d\u00e9ficit en cobalamine. Des fourmillements dans les mains et les pieds, appel\u00e9s paresth\u00e9sies, signalent fr\u00e9quemment une atteinte neurologique d\u00e9butante.<sup>[8]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les troubles de la m\u00e9moire, les difficult\u00e9s de concentration et la confusion peuvent survenir, notamment chez les personnes \u00e2g\u00e9es. Une instabilit\u00e9 \u00e0 la marche, une diminution de la sensibilit\u00e9 ou des troubles de l&rsquo;\u00e9quilibre apparaissent dans les formes plus avanc\u00e9es.<sup>[6]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sur le plan psychologique, l&rsquo;irritabilit\u00e9, l&rsquo;anxi\u00e9t\u00e9 et les \u00e9tats d\u00e9pressifs r\u00e9actionnels apparaissent. Ces sympt\u00f4mes neurologiques peuvent se manifester sans an\u00e9mie associ\u00e9e, ce qui souligne l&rsquo;importance d&rsquo;un d\u00e9pistage pr\u00e9coce avant toute installation de s\u00e9quelles potentiellement irr\u00e9versibles.<sup>[5]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3880a84a\"><h3 class=\"uagb-heading-text\">Cons\u00e9quences sanguines&nbsp;: an\u00e9mie m\u00e9galoblastique et hyperhomocyst\u00e9in\u00e9mie<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La vitamine B12 intervient dans la synth\u00e8se de l&rsquo;ADN et la division cellulaire, notamment au niveau de la moelle osseuse. Son d\u00e9ficit perturbe la maturation des globules rouges, entra\u00eenant une an\u00e9mie macrocytaire ou m\u00e9galoblastique.<sup>[7]<\/sup><\/p>\n\n\n\r\n<section class=\"article-callout article-callout--takeaway panel summary-box\">\r\n\r\n    <div class=\"article-callout__header\">\r\n      <span class=\"article-callout__icon\" aria-hidden=\"true\">\r\n                  <svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n            <path d=\"M5.14286 14C4.41735 12.8082 4 11.4118 4 9.91886C4 5.54539 7.58172 2 12 2C16.4183 2 20 5.54539 20 9.91886C20 11.4118 19.5827 12.8082 18.8571 14\" stroke=\"#98800B\" stroke-width=\"1.5\" stroke-linecap=\"round\"\/>\r\n            <path d=\"M7.38287 17.0982C7.291 16.8216 7.24507 16.6833 7.25042 16.5713C7.26174 16.3343 7.41114 16.1262 7.63157 16.0405C7.73579 16 7.88105 16 8.17157 16H15.8284C16.119 16 16.2642 16 16.3684 16.0405C16.5889 16.1262 16.7383 16.3343 16.7496 16.5713C16.7549 16.6833 16.709 16.8216 16.6171 17.0982C16.4473 17.6094 16.3624 17.8651 16.2315 18.072C15.9572 18.5056 15.5272 18.8167 15.0306 18.9408C14.7935 19 14.525 19 13.9881 19H10.0119C9.47495 19 9.2065 19 8.96944 18.9408C8.47283 18.8167 8.04281 18.5056 7.7685 18.072C7.63755 17.8651 7.55266 17.6094 7.38287 17.0982Z\" stroke=\"#98800B\" stroke-width=\"1.5\"\/>\r\n            <path d=\"M15 19L14.8707 19.6466C14.7293 20.3537 14.6586 20.7072 14.5001 20.9866C14.2552 21.4185 13.8582 21.7439 13.3866 21.8994C13.0816 22 12.7211 22 12 22C11.2789 22 10.9184 22 10.6134 21.8994C10.1418 21.7439 9.74484 21.4185 9.49987 20.9866C9.34144 20.7072 9.27073 20.3537 9.12932 19.6466L9 19\" stroke=\"#98800B\" stroke-width=\"1.5\"\/>\r\n            <path d=\"M12 16V11\" stroke=\"#98800B\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\r\n          <\/svg>\r\n                <\/span>\r\n\r\n      <p class=\"article-callout__title\">\r\n        Bon \u00e0 savoir      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"article-callout__content\">\r\n      \n<p class=\"wp-block-paragraph\">L&rsquo;an\u00e9mie m\u00e9galoblastique se caract\u00e9rise par la production de globules rouges anormalement gros et peu fonctionnels. Le diagnostic se confirme par une num\u00e9ration formule sanguine montrant un volume globulaire moyen \u00e9lev\u00e9. Cette forme particuli\u00e8re d&rsquo;an\u00e9mie peut s&rsquo;accompagner d&rsquo;une baisse des plaquettes et des globules blancs dans les formes s\u00e9v\u00e8res de carence en vitamine B12.<\/p>\n    <\/div>\r\n\r\n<\/section>\n\n\n<p class=\"wp-block-paragraph\">Le d\u00e9ficit en B12 entra\u00eene aussi une augmentation du taux d&rsquo;homocyst\u00e9ine dans le sang. Cette hyperhomocyst\u00e9in\u00e9mie est d\u00e9sormais associ\u00e9e \u00e0 une fragilit\u00e9 cardio-vasculaire accrue. La cobalamine contribue au m\u00e9tabolisme normal de l&rsquo;homocyst\u00e9ine en participant \u00e0 sa transformation en m\u00e9thionine.<sup>[3]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-99905918\"><h3 class=\"uagb-heading-text\">Autres sympt\u00f4mes&nbsp;: probl\u00e8mes digestifs, langue enfl\u00e9e<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;appareil digestif n&rsquo;\u00e9chappe pas aux cons\u00e9quences d&rsquo;un d\u00e9ficit prolong\u00e9. Une langue lisse, gonfl\u00e9e et douloureuse, appel\u00e9e glossite de Hunter, constitue un signe \u00e9vocateur classique.<sup>[7]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des troubles digestifs vari\u00e9s peuvent accompagner la carence&nbsp;: naus\u00e9es, ballonnements, diarrh\u00e9e ou constipation altern\u00e9es. Une perte progressive de l&rsquo;app\u00e9tit s&rsquo;installe parfois insidieusement.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sur la peau, des modifications de la pigmentation et une fragilit\u00e9 des phan\u00e8res s&rsquo;observent occasionnellement. Une jaunisse mod\u00e9r\u00e9e, due \u00e0 la destruction pr\u00e9matur\u00e9e des globules rouges anormaux, peut \u00e9galement appara\u00eetre. L&rsquo;ensemble de ces signes cliniques \u00e9vocateurs n\u00e9cessite une exploration biologique pour confirmer l&rsquo;origine du trouble.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-f0d7d8e9\"><h2 class=\"uagb-heading-text\">Comment diagnostiquer une carence en vitamine B12&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-493d7637\"><h3 class=\"uagb-heading-text\">Le dosage de la vitamine B12 s\u00e9rique&nbsp;: un indicateur cl\u00e9<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Le dosage sanguin reste la premi\u00e8re \u00e9tape du diagnostic. Une concentration inf\u00e9rieure \u00e0 180 ng\/mL signe une carence av\u00e9r\u00e9e, tandis qu&rsquo;un taux sup\u00e9rieur \u00e0 350 ng\/mL rend le d\u00e9ficit peu probable.<sup>[6]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entre ces deux seuils, la zone d&rsquo;incertitude justifie souvent des examens compl\u00e9mentaires pour affiner l&rsquo;interpr\u00e9tation des r\u00e9sultats biologiques.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-41039184\"><h3 class=\"uagb-heading-text\">Marqueurs fonctionnels et examens compl\u00e9mentaires (AMM, test de Schilling)<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Le dosage de l&rsquo;acide m\u00e9thylmalonique et de l&rsquo;homocyst\u00e9ine permet d&rsquo;\u00e9valuer plus finement la disponibilit\u00e9 cellulaire de la B12. Ces marqueurs fonctionnels s&rsquo;\u00e9l\u00e8vent pr\u00e9cocement, parfois avant m\u00eame la baisse du taux s\u00e9rique.<sup>[5]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La recherche d&rsquo;anticorps anti-facteur intrins\u00e8que et anti-cellules pari\u00e9tales oriente vers une maladie de Biermer.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3ae6a67e\"><h3 class=\"uagb-heading-text\">Quand consulter un professionnel de sant\u00e9&nbsp;?<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Une fatigue persistante inexpliqu\u00e9e, des fourmillements aux extr\u00e9mit\u00e9s ou des troubles de la m\u00e9moire doivent inciter \u00e0 consulter. Les personnes \u00e2g\u00e9es, les v\u00e9g\u00e9taliens et les patients sous traitement prolong\u00e9 repr\u00e9sentent des populations \u00e0 surveiller particuli\u00e8rement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un avis m\u00e9dical est n\u00e9cessaire pour orienter le bilan et d\u00e9finir la strat\u00e9gie adapt\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-099e62bc\"><h2 class=\"uagb-heading-text\">Comment corriger une carence en vitamine B12&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-2598795a\"><h3 class=\"uagb-heading-text\">Les diff\u00e9rentes formes de suppl\u00e9mentation&nbsp;: orale et intramusculaire<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La voie orale convient principalement aux <strong>carences d&rsquo;apport alimentaire<\/strong>, avec des doses de 250 \u00e0 1000 \u00b5g par jour selon la s\u00e9v\u00e9rit\u00e9.<sup>[6]<\/sup> La voie intramusculaire est privil\u00e9gi\u00e9e en cas de d\u00e9faut d&rsquo;absorption av\u00e9r\u00e9, comme dans la maladie de Biermer ou apr\u00e8s une chirurgie bariatrique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le choix de la voie d\u00e9pend donc de la cause sous-jacente et du contexte clinique.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-da43a65f\"><h3 class=\"uagb-heading-text\">Posologie et dur\u00e9e du traitement&nbsp;: adapter selon la cause et la s\u00e9v\u00e9rit\u00e9<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">En cas de carence d&rsquo;apport, un comprim\u00e9 de 250 \u00b5g \u00e0 500 \u00b5g par jour pour restaurer le stock h\u00e9patique pendant 15 \u00e0 30 jours, suivi d&rsquo;une prise tous les dix jours, suffit habituellement.<sup>[6]<\/sup> Pour les d\u00e9fauts d&rsquo;absorption s\u00e9v\u00e8res, le protocole intramusculaire pr\u00e9voit 1000 \u00b5g quotidiens pendant dix jours, puis une injection mensuelle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La dur\u00e9e du traitement est g\u00e9n\u00e9ralement \u00e0 vie dans les formes d&rsquo;origine auto-immune ou post-chirurgicale.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-1e5e5325\"><h3 class=\"uagb-heading-text\">L&rsquo;importance de la biodisponibilit\u00e9 des formes de B12 (m\u00e9thylcobalamine vs cyanocobalamine)<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Quatre formes principales coexistent dans les compl\u00e9ments alimentaires&nbsp;: cyanocobalamine, m\u00e9thylcobalamine, hydroxocobalamine et ad\u00e9nosylcobalamine.<sup>[9]<\/sup> Au niveau intestinal, leur absorption demeure relativement comparable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Au niveau cellulaire, les formes m\u00e9thylcobalamine et ad\u00e9nosylcobalamine, directement bioactives, pr\u00e9sentent l&rsquo;avantage de ne pas n\u00e9cessiter d&rsquo;\u00e9tape de conversion par l&rsquo;organisme.<sup>[9]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-c60a7618\"><h2 class=\"uagb-heading-text\">Comment pr\u00e9venir la carence en vitamine B12&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-a85edd05\"><h3 class=\"uagb-heading-text\">Aliments riches en vitamine B12&nbsp;: o\u00f9 la trouver naturellement&nbsp;?<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les aliments d&rsquo;origine animale concentrent l&rsquo;essentiel de la vitamine B12 disponible dans notre alimentation. Les abats, et particuli\u00e8rement le foie de veau ou de b\u0153uf, en repr\u00e9sentent les sources les plus riches.<sup>[2]<\/sup><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Aliment<\/th><th>Teneur en vitamine B12 (\u00b5g pour 100 g)<\/th><\/tr><\/thead><tbody><tr><td>Foie de veau cuit<\/td><td>60 \u00e0 80<\/td><\/tr><tr><td>Palourdes, hu\u00eetres<\/td><td>20 \u00e0 30<\/td><\/tr><tr><td>Hareng, maquereau, sardine<\/td><td>8 \u00e0 12<\/td><\/tr><tr><td>B\u0153uf, agneau<\/td><td>2 \u00e0 3<\/td><\/tr><tr><td>\u0152ufs<\/td><td>1 \u00e0 2<\/td><\/tr><tr><td>Produits laitiers<\/td><td>0,3 \u00e0 1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Les fruits de mer, poissons gras, viandes rouges et \u0153ufs compl\u00e8tent ce panel alimentaire. Une alimentation omnivore vari\u00e9e couvre ais\u00e9ment les 4 \u00b5g journaliers recommand\u00e9s par l&rsquo;ANSES pour un adulte.<sup>[1]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-17c59870\"><h3 class=\"uagb-heading-text\">Strat\u00e9gies pour les v\u00e9g\u00e9tariens et v\u00e9g\u00e9taliens&nbsp;: aliments enrichis et suppl\u00e9ments<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les r\u00e9gimes v\u00e9g\u00e9taliens n\u00e9cessitent obligatoirement une suppl\u00e9mentation pour \u00e9viter le d\u00e9ficit. Les aliments enrichis, comme certaines boissons v\u00e9g\u00e9tales, levures alimentaires fortifi\u00e9es ou c\u00e9r\u00e9ales du petit-d\u00e9jeuner, peuvent contribuer aux apports.<sup>[4]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une suppl\u00e9mentation en vitamine B12 par voie orale, sous forme de comprim\u00e9s ou de gouttes, reste cependant la solution la plus fiable. Au laboratoire Nutrixeal, nous privil\u00e9gions les formes naturelles biodisponibles&nbsp;: la m\u00e9thylcobalamine et l&rsquo;ad\u00e9nosylcobalamine, pour optimiser l&rsquo;utilisation cellulaire de la vitamine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les v\u00e9g\u00e9tariens consommant \u0153ufs et produits laitiers atteignent plus facilement leurs besoins, mais une vigilance reste de mise apr\u00e8s plusieurs ann\u00e9es de ce r\u00e9gime.<\/p>\n\n\n\r\n<section class=\"article-callout article-callout--takeaway panel summary-box\">\r\n\r\n    <div class=\"article-callout__header\">\r\n      <span class=\"article-callout__icon\" aria-hidden=\"true\">\r\n                  <svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\r\n            <path d=\"M5.14286 14C4.41735 12.8082 4 11.4118 4 9.91886C4 5.54539 7.58172 2 12 2C16.4183 2 20 5.54539 20 9.91886C20 11.4118 19.5827 12.8082 18.8571 14\" stroke=\"#98800B\" stroke-width=\"1.5\" stroke-linecap=\"round\"\/>\r\n            <path d=\"M7.38287 17.0982C7.291 16.8216 7.24507 16.6833 7.25042 16.5713C7.26174 16.3343 7.41114 16.1262 7.63157 16.0405C7.73579 16 7.88105 16 8.17157 16H15.8284C16.119 16 16.2642 16 16.3684 16.0405C16.5889 16.1262 16.7383 16.3343 16.7496 16.5713C16.7549 16.6833 16.709 16.8216 16.6171 17.0982C16.4473 17.6094 16.3624 17.8651 16.2315 18.072C15.9572 18.5056 15.5272 18.8167 15.0306 18.9408C14.7935 19 14.525 19 13.9881 19H10.0119C9.47495 19 9.2065 19 8.96944 18.9408C8.47283 18.8167 8.04281 18.5056 7.7685 18.072C7.63755 17.8651 7.55266 17.6094 7.38287 17.0982Z\" stroke=\"#98800B\" stroke-width=\"1.5\"\/>\r\n            <path d=\"M15 19L14.8707 19.6466C14.7293 20.3537 14.6586 20.7072 14.5001 20.9866C14.2552 21.4185 13.8582 21.7439 13.3866 21.8994C13.0816 22 12.7211 22 12 22C11.2789 22 10.9184 22 10.6134 21.8994C10.1418 21.7439 9.74484 21.4185 9.49987 20.9866C9.34144 20.7072 9.27073 20.3537 9.12932 19.6466L9 19\" stroke=\"#98800B\" stroke-width=\"1.5\"\/>\r\n            <path d=\"M12 16V11\" stroke=\"#98800B\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\r\n          <\/svg>\r\n                <\/span>\r\n\r\n      <p class=\"article-callout__title\">\r\n        Bon \u00e0 savoir      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"article-callout__content\">\r\n      \n<p class=\"wp-block-paragraph\">Selon l&rsquo;ANSES, les apports satisfaisants en vitamine B12 sont fix\u00e9s \u00e0 4 \u00b5g par jour pour un adulte, 4,5 \u00b5g pendant la grossesse et 5 \u00b5g pendant l&rsquo;allaitement. Ces besoins accrus s&rsquo;expliquent par le transfert de B12 vers le f\u0153tus puis le nourrisson. Une suppl\u00e9mentation pr\u00e9ventive est souvent recommand\u00e9e chez les femmes v\u00e9g\u00e9taliennes durant ces p\u00e9riodes physiologiques particuli\u00e8res.<sup>[1]<\/sup><\/p>\n    <\/div>\r\n\r\n<\/section>\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-7555908c\"><h3 class=\"uagb-heading-text\">Conseils pour maintenir un taux optimal de vitamine B12<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Une alimentation diversifi\u00e9e incluant r\u00e9guli\u00e8rement des produits d&rsquo;origine animale demeure la meilleure strat\u00e9gie pour la majorit\u00e9 des personnes. La consommation hebdomadaire de poissons, d&rsquo;\u0153ufs et de viandes maigres assure un apport r\u00e9gulier.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un d\u00e9pistage biologique p\u00e9riodique est conseill\u00e9 apr\u00e8s 60 ans, en cas de prise prolong\u00e9e d&rsquo;antiacides ou de metformine, et chez les personnes ayant subi une chirurgie digestive. Cette surveillance pr\u00e9ventive permet d&rsquo;anticiper l&rsquo;installation d&rsquo;un d\u00e9ficit silencieux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les profils \u00e0 risque identifi\u00e9s, une suppl\u00e9mentation cibl\u00e9e et adapt\u00e9e constitue une mesure simple et efficace afin de maintenir un statut vitaminique optimal au fil des ann\u00e9es.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-68c8d9a4\"><h2 class=\"uagb-heading-text\">Bienfaits compl\u00e9mentaires de la vitamine B12<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-e1ee0b42\"><h3 class=\"uagb-heading-text\">La vitamine B12 et le fonctionnement normal du syst\u00e8me immunitaire<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Au-del\u00e0 de son r\u00f4le dans la formation des globules rouges, la vitamine B12 contribue au fonctionnement normal du syst\u00e8me immunitaire.<sup>[3]<\/sup> Elle participe \u00e0 la maturation des cellules de l&rsquo;immunit\u00e9 produites par la moelle osseuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un statut optimal en cobalamine soutient ainsi les d\u00e9fenses naturelles de l&rsquo;organisme, en particulier durant les p\u00e9riodes de fatigue ou de fragilit\u00e9 saisonni\u00e8re.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-942fcc0a\"><h3 class=\"uagb-heading-text\">La vitamine B12 et le processus de division cellulaire<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La vitamine B12 joue un r\u00f4le dans le processus de division cellulaire.<sup>[3]<\/sup> Elle intervient dans la synth\u00e8se de l&rsquo;ADN, \u00e9tape indispensable \u00e0 la multiplication et au renouvellement des cellules de l&rsquo;organisme.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette fonction explique pourquoi les tissus \u00e0 renouvellement rapide, comme la moelle osseuse et les muqueuses digestives, sont les premiers affect\u00e9s en cas de d\u00e9ficit prolong\u00e9.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-ac005cf6\"><h2 class=\"uagb-heading-text\">FAQ&nbsp;: Vos questions sur la carence en vitamine B12<\/h2><\/div>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782202161303\"><strong class=\"schema-faq-question\">Combien de temps faut-il pour se r\u00e9tablir d&rsquo;une carence en B12&nbsp;?<\/strong> <p class=\"schema-faq-answer\">Les sympt\u00f4mes h\u00e9matologiques r\u00e9gressent g\u00e9n\u00e9ralement en quelques semaines apr\u00e8s le d\u00e9but de la suppl\u00e9mentation. La r\u00e9cup\u00e9ration neurologique, en revanche, peut n\u00e9cessiter plusieurs mois selon l&rsquo;anciennet\u00e9 du d\u00e9ficit.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782202181476\"><strong class=\"schema-faq-question\">Une carence en B12 peut-elle causer des sympt\u00f4mes neurologiques sans an\u00e9mie&nbsp;?<\/strong> <p class=\"schema-faq-answer\">Oui, des manifestations comme les fourmillements, les troubles de la m\u00e9moire ou les difficult\u00e9s de marche peuvent appara\u00eetre en l&rsquo;absence totale d&rsquo;an\u00e9mie.[5] Ce ph\u00e9nom\u00e8ne justifie un d\u00e9pistage pr\u00e9coce.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782202177632\"><strong class=\"schema-faq-question\">Quelles sont les cons\u00e9quences d&rsquo;une carence prolong\u00e9e en vitamine B12&nbsp;?<\/strong> <p class=\"schema-faq-answer\">Un d\u00e9ficit non corrig\u00e9 peut entra\u00eener des l\u00e9sions neurologiques irr\u00e9versibles, des troubles cognitifs persistants et une an\u00e9mie s\u00e9v\u00e8re. Une fragilit\u00e9 cardio-vasculaire est \u00e9galement associ\u00e9e \u00e0 l&rsquo;hyperhomocyst\u00e9in\u00e9mie chronique.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782202176593\"><strong class=\"schema-faq-question\">Peut-on surdoser la vitamine B12&nbsp;? Effets ind\u00e9sirables potentiels<\/strong> <p class=\"schema-faq-answer\">La vitamine B12 est tr\u00e8s peu toxique, les exc\u00e8s \u00e9tant \u00e9limin\u00e9s dans les urines et les selles.<sup>[10]<\/sup> Aucune limite sup\u00e9rieure de s\u00e9curit\u00e9 n&rsquo;a \u00e9t\u00e9 \u00e9tablie par les autorit\u00e9s sanitaires.<\/p> <\/div> <\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-f7d99bfd\"><h2 class=\"uagb-heading-text\">Sources bibliographiques<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">[1] ANSES. R\u00e9f\u00e9rences nutritionnelles en vitamines et min\u00e9raux. Avis de l&rsquo;Agence nationale de s\u00e9curit\u00e9 sanitaire de l&rsquo;alimentation, de l&rsquo;environnement et du travail, 2025.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[2] ANSES. Table de composition nutritionnelle des aliments Ciqual. Agence nationale de s\u00e9curit\u00e9 sanitaire de l&rsquo;alimentation, de l&rsquo;environnement et du travail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[3] EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on Dietary Reference Values for cobalamin (vitamin B12). EFSA Journal, 2015;13(7):4150.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[4] Pawlak R, Lester SE, Babatunde T. The prevalence of cobalamin deficiency among vegetarians assessed by serum vitamin B12: a review of literature. European Journal of Clinical Nutrition, 2014;68(5):541-548.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[5] Stabler SP. Vitamin B12 deficiency. New England Journal of Medicine, 2013;368(2):149-160.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[6] Haute Autorit\u00e9 de Sant\u00e9. Recommandations sur la prise en charge de la carence en vitamine B12. HAS, 2024.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[7] Green R, Allen LH, Bj\u00f8rke-Monsen AL, et al. Vitamin B12 deficiency. Nature Reviews Disease Primers, 2017;3:17040.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[8] National Institutes of Health, Office of Dietary Supplements. Vitamin B12: Fact Sheet for Health Professionals. NIH, 2024.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[9] Paul C, Brady DM. Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms. Integrative Medicine, 2017;16(1):42-49.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[10] EFSA Scientific Committee. Tolerable Upper Intake Levels for Vitamins and Minerals. European Food Safety Authority, 2006.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La vitamine B12, ou cobalamine, joue un r\u00f4le vital dans le fonctionnement de notre organisme. Une carence en vitamine B12 peut entra\u00eener fatigue persistante, troubles neurologiques et an\u00e9mie. Nous vous proposons un tour d&rsquo;horizon complet pour reconna\u00eetre les signes, comprendre les causes et adopter les bonnes solutions au quotidien. Qu&rsquo;est-ce que la vitamine B12 et [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1008,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","nutrixeal_featured":false,"nutrixeal_most_read":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-762","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-vitamine-b12"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Carence vitamine B12 : sympt\u00f4mes, causes et solutions<\/title>\n<meta name=\"description\" content=\"Fatigue, troubles de m\u00e9moire, engourdissements ? Identifiez les sympt\u00f4mes d&#039;une carence en vitamine B12 et trouvez des solutions efficaces pour y rem\u00e9dier.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nutrixeal.fr\/expertise\/carence-vitamine-b12-symptomes-causes-solutions\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Carence vitamine B12 : sympt\u00f4mes, causes et solutions\" \/>\n<meta property=\"og:description\" content=\"Fatigue, troubles de m\u00e9moire, engourdissements ? 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scientifique Nutrixeal","author_link":"https:\/\/www.nutrixeal.fr\/expertise\/author\/equipe-scientifique\/"},"uagb_comment_info":0,"uagb_excerpt":"La vitamine B12, ou cobalamine, joue un r\u00f4le vital dans le fonctionnement de notre organisme. Une carence en vitamine B12 peut entra\u00eener fatigue persistante, troubles neurologiques et an\u00e9mie. Nous vous proposons un tour d&rsquo;horizon complet pour reconna\u00eetre les signes, comprendre les causes et adopter les bonnes solutions au quotidien. 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