{"id":573,"date":"2026-06-15T15:00:53","date_gmt":"2026-06-15T14:00:53","guid":{"rendered":"https:\/\/dev-prestashop-2b2cd056cbc0.prestashop.sh\/blog\/?p=573"},"modified":"2026-06-26T09:53:57","modified_gmt":"2026-06-26T08:53:57","slug":"surdosage-vitamine-c-symptomes-risques","status":"publish","type":"post","link":"https:\/\/www.nutrixeal.fr\/expertise\/surdosage-vitamine-c-symptomes-risques\/","title":{"rendered":"Quels sont les risques et les sympt\u00f4mes d&rsquo;un surdosage de vitamine C&nbsp;?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La vitamine C reste un nutriment essentiel au fonctionnement de l&rsquo;organisme, mais sa consommation excessive soul\u00e8ve des questions l\u00e9gitimes. &nbsp;Pour mieux comprendre comment adapter vos apports, il est utile de conna\u00eetre les recommandations et les situations qui m\u00e9ritent une attention particuli\u00e8re. Le laboratoire Nutrixeal vous propose un \u00e9clairage complet pour vous aider \u00e0 ajuster votre consommation en toute s\u00e9r\u00e9nit\u00e9.<\/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>Inconforts digestifs fr\u00e9quents<\/strong>&nbsp;: Un exc\u00e8s de vitamine C (&gt; 2g par jour) provoque surtout naus\u00e9es, diarrh\u00e9e, crampes abdominales ou br\u00fblures gastriques.<\/li>\n\n\n\n<li><strong>Risque g\u00e9n\u00e9ralement faible<\/strong>&nbsp;: Chez l\u2019adulte en bonne sant\u00e9, le surplus est largement \u00e9limin\u00e9 par les urines, car la vitamine C est hydrosoluble.<\/li>\n\n\n\n<li><strong>Seuils \u00e0 surveiller<\/strong>&nbsp;: Au-del\u00e0 de 2 000 mg par jour, l\u2019inconfort digestif devient plus probable&nbsp;; les fortes doses prolong\u00e9es sont \u00e0 \u00e9viter.<\/li>\n\n\n\n<li><strong>Pr\u00e9vention simple<\/strong>: Respecter les doses, \u00e9viter les cumuls, fractionner les prises ou choisir une forme liposomale am\u00e9liore la tol\u00e9rance.<\/li>\n<\/ul>\n    <\/div>\r\n\r\n<\/section>\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fdd844d4\"><h2 class=\"uagb-heading-text\">Quels sont les sympt\u00f4mes d&rsquo;un exc\u00e8s de vitamine C&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Un apport trop important en acide ascorbique peut provoquer quelques effets ind\u00e9sirables identifiables. Les manifestations les plus fr\u00e9quemment rapport\u00e9es concernent la sph\u00e8re digestive, car les doses \u00e9lev\u00e9es non absorb\u00e9es s\u00e9journent dans l&rsquo;intestin et perturbent son fonctionnement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les principaux sympt\u00f4mes associ\u00e9s \u00e0 un exc\u00e8s de vitamine C incluent&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>des troubles digestifs&nbsp;: naus\u00e9es, diarrh\u00e9e, crampes abdominales et br\u00fblures gastriques&nbsp;;<\/li>\n\n\n\n<li>des maux de t\u00eate et une sensation de fatigue inhabituelle&nbsp;;<\/li>\n\n\n\n<li>des modifications urinaires avec une fr\u00e9quence accrue&nbsp;;<\/li>\n\n\n\n<li>plus rarement, des douleurs articulaires ou des r\u00e9actions cutan\u00e9es chez les personnes sensibles.<sup>[1]<\/sup><\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-5288c039\"><h2 class=\"uagb-heading-text\">\u00c0 partir de quelle dose parle-t-on de surdosage&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pour situer la limite, l&rsquo;apport journalier recommand\u00e9 par l&rsquo;ANSES s&rsquo;\u00e9l\u00e8ve \u00e0 110 mg par jour pour un adulte en bonne sant\u00e9.<sup>[2]<\/sup> Cette valeur constitue un rep\u00e8re nutritionnel destin\u00e9 \u00e0 couvrir les besoins biologiques de la majorit\u00e9 des adultes. Dans certaines situations, les besoins peuvent toutefois varier, ce qui peut justifier des apports plus \u00e9lev\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La limite sup\u00e9rieure de s\u00e9curit\u00e9 est fix\u00e9e \u00e0 1 000 mg par jour selon la r\u00e9glementation fran\u00e7aise pour les compl\u00e9ments alimentaires. Au-del\u00e0, des effets secondaires digestifs peuvent appara\u00eetre. Le seuil maximal tol\u00e9rable \u00e9tabli par les autorit\u00e9s scientifiques internationales atteint 2 000 mg par jour chez l&rsquo;adulte.<sup>[3]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On parle donc de surdosage \u00e0 partir de doses d\u00e9passant durablement ces seuils, sans encadrement m\u00e9dical.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-c45f0ccb\"><h2 class=\"uagb-heading-text\">Quels sont les risques d&rsquo;un surdosage chronique ou aigu de vitamine C&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-064bf1bd\"><h3 class=\"uagb-heading-text\"><strong>Un risque g\u00e9n\u00e9ralement faible chez l\u2019adulte en bonne sant\u00e9<\/strong><\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Chez l\u2019adulte en bonne sant\u00e9, le risque li\u00e9 \u00e0 un exc\u00e8s de vitamine C reste g\u00e9n\u00e9ralement tr\u00e8s faible. La vitamine C est une vitamine hydrosoluble&nbsp;: cela signifie qu\u2019elle se dissout dans l\u2019eau et qu\u2019elle n\u2019est pas stock\u00e9e en grande quantit\u00e9 par l\u2019organisme. Lorsque les apports augmentent fortement, son absorption diminue naturellement et l\u2019exc\u00e9dent est en grande partie \u00e9limin\u00e9 dans les urines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est l\u2019une des raisons pour lesquelles la vitamine C est consid\u00e9r\u00e9e comme une vitamine \u00e0 faible toxicit\u00e9. En pratique, les situations de surdosage concernent surtout les prises tr\u00e8s \u00e9lev\u00e9es, notamment lorsqu\u2019elles sont r\u00e9p\u00e9t\u00e9es ou lorsqu\u2019une personne cumule plusieurs produits contenant d\u00e9j\u00e0 de la vitamine C.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il ne s\u2019agit donc pas de se m\u00e9fier de la vitamine C, mais plut\u00f4t d\u2019adopter un usage ajust\u00e9 \u00e0 ses besoins.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-87ebfcb1\"><h3 class=\"uagb-heading-text\"><strong>Les troubles digestifs&nbsp;: l\u2019effet ind\u00e9sirable le plus courant<\/strong><\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les troubles digestifs sont les effets les plus fr\u00e9quemment rapport\u00e9s en cas d\u2019apports \u00e9lev\u00e9s en vitamine C (&gt; 2g par jour). Ils peuvent se traduire par une diarrh\u00e9e passag\u00e8re, des douleurs abdominales, des naus\u00e9es, des br\u00fblures d\u2019estomac ou une sensation d\u2019inconfort apr\u00e8s la prise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces r\u00e9actions ne signifient pas n\u00e9cessairement qu\u2019il existe un probl\u00e8me grave. Elles indiquent souvent que la dose prise d\u00e9passe ce que l\u2019organisme tol\u00e8re confortablement \u00e0 ce moment-l\u00e0. Dans ce cas, r\u00e9duire la dose, fractionner la prise ou privil\u00e9gier un dosage plus adapt\u00e9 peut suffire \u00e0 am\u00e9liorer la tol\u00e9rance. Pour les personnes particuli\u00e8rement sensibles sur le plan digestif, les formes liposomales de vitamine C repr\u00e9sentent une alternative int\u00e9ressante, car elles sont reconnues pour leur meilleure tol\u00e9rance et leur absorption progressive.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-b7275414\"><h3 class=\"uagb-heading-text\">Interactions avec le m\u00e9tabolisme du fer (h\u00e9mochromatose)<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La <a href=\"https:\/\/www.nutrixeal.fr\/71-vitamine-c\">vitamine C<\/a> accro\u00eet significativement l&rsquo;absorption intestinale du fer non h\u00e9minique, celui issu des aliments v\u00e9g\u00e9taux. Cette propri\u00e9t\u00e9, normalement b\u00e9n\u00e9fique, devient pr\u00e9occupante chez les personnes atteintes d&rsquo;h\u00e9mochromatose, une maladie g\u00e9n\u00e9tique caract\u00e9ris\u00e9e par une surcharge en fer de l&rsquo;organisme.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chez ces patients, des apports \u00e9lev\u00e9s peuvent aggraver l&rsquo;accumulation tissulaire de fer dans le foie, le pancr\u00e9as ou le c\u0153ur. Un encadrement m\u00e9dical est indispensable avant toute suppl\u00e9mentation.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3ca1ad7d\"><h3 class=\"uagb-heading-text\">Interactions avec certains traitements m\u00e9dicaux<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">La vitamine C est g\u00e9n\u00e9ralement tr\u00e8s bien tol\u00e9r\u00e9e, mais certaines pr\u00e9cautions peuvent \u00eatre utiles en cas de traitement m\u00e9dical. \u00c0 fortes doses, elle pourrait notamment interf\u00e9rer avec certaines chimioth\u00e9rapies dont l\u2019action repose en partie sur des m\u00e9canismes d\u2019oxydation cellulaire.[4]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces situations restent sp\u00e9cifiques et ne doivent pas conduire \u00e0 \u00e9viter syst\u00e9matiquement la vitamine C. En revanche, lorsqu\u2019un traitement m\u00e9dical est en cours, surtout en cas de maladie chronique, de traitement lourd ou de suppl\u00e9mentation fortement dos\u00e9e, il est pr\u00e9f\u00e9rable de demander conseil \u00e0 un professionnel de sant\u00e9 afin d\u2019adapter les apports en toute s\u00e9r\u00e9nit\u00e9.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-e3379ac0\"><h2 class=\"uagb-heading-text\">Qui doit \u00eatre particuli\u00e8rement vigilant face \u00e0 un exc\u00e8s de vitamine C&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-55d18eed\"><h3 class=\"uagb-heading-text\">Personnes pr\u00e9dispos\u00e9es aux calculs r\u00e9naux<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les individus ayant des ant\u00e9c\u00e9dents personnels ou familiaux de lithiase oxalo-calcique constituent une population sensible. Pour ces profils, il est recommand\u00e9 de limiter la suppl\u00e9mentation \u00e0 500 mg par jour maximum, ou de respecter strictement les indications m\u00e9dicales.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les apports issus de l&rsquo;alimentation classique ne sont pas concern\u00e9s par cette pr\u00e9caution, car les fruits et l\u00e9gumes apportent simultan\u00e9ment des compos\u00e9s protecteurs contre la formation de cristaux. Une bonne hydratation quotidienne reste un facteur essentiel.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-449a0659\"><h3 class=\"uagb-heading-text\">Individus souffrant d&rsquo;insuffisance r\u00e9nale<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les reins jouent un r\u00f4le central dans l&rsquo;\u00e9limination de la vitamine C exc\u00e9dentaire. Lorsque leur fonction est alt\u00e9r\u00e9e, cette capacit\u00e9 d&rsquo;\u00e9puration diminue et l&rsquo;acide ascorbique s&rsquo;accumule dans l&rsquo;organisme, avec une augmentation parall\u00e8le des m\u00e9tabolites oxaliques.<sup>[4]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour ces personnes, m\u00eame des doses consid\u00e9r\u00e9es comme mod\u00e9r\u00e9es chez un sujet sain peuvent pr\u00e9senter un risque. L&rsquo;ajustement des apports doit se faire en concertation avec le n\u00e9phrologue ou le m\u00e9decin traitant, en tenant compte du stade de l&rsquo;atteinte r\u00e9nale.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-9b89a870\"><h3 class=\"uagb-heading-text\">Personnes atteintes de troubles du m\u00e9tabolisme du fer<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Au-del\u00e0 de l&rsquo;h\u00e9mochromatose, d&rsquo;autres troubles du m\u00e9tabolisme du fer appellent \u00e0 la prudence&nbsp;: la thalass\u00e9mie sous transfusions r\u00e9guli\u00e8res ou certaines formes d&rsquo;an\u00e9mie sid\u00e9roblastique. Une d\u00e9ficience en glucose-6-phosphate d\u00e9shydrog\u00e9nase (G6PD) constitue \u00e9galement une situation sensible.<sup>[5]<\/sup>&nbsp;<\/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\">La vitamine C reste hydrosoluble&nbsp;: l&rsquo;organisme \u00e9limine naturellement par les urines une grande partie des doses non utilis\u00e9es. Cette caract\u00e9ristique explique la marge de s\u00e9curit\u00e9 relativement large de cette vitamine. Comme pour tout compl\u00e9ment alimentaire, l\u2019essentiel est surtout d\u2019adapter la dose \u00e0 ses besoins et \u00e0 son profil. En cas de prise prolong\u00e9e, de dosage \u00e9lev\u00e9 ou de situation particuli\u00e8re, un avis professionnel permet de choisir une suppl\u00e9mentation adapt\u00e9e.<\/p>\n    <\/div>\r\n\r\n<\/section>\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-f9549597\"><h2 class=\"uagb-heading-text\">Comment \u00e9viter le surdosage de vitamine C&nbsp;?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-06ff921e\"><h3 class=\"uagb-heading-text\">Privil\u00e9gier les sources alimentaires naturelles<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Les fruits et l\u00e9gumes frais repr\u00e9sentent la voie la plus s\u00fbre pour couvrir vos besoins. Le poivron cru, le kiwi, les agrumes, le cassis, la goyave et les choux apportent des quantit\u00e9s significatives d&rsquo;acide ascorbique, sans aucun risque de surdosage.<sup>[2]<\/sup> Trois portions quotidiennes suffisent g\u00e9n\u00e9ralement \u00e0 atteindre la dose journali\u00e8re recommand\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-513eb95c\"><h3 class=\"uagb-heading-text\">Respecter les dosages recommand\u00e9s pour les compl\u00e9ments<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Lors de l&rsquo;utilisation de compl\u00e9ments alimentaires, le dosage indiqu\u00e9 sur l&rsquo;\u00e9tiquetage doit \u00eatre respect\u00e9. Au laboratoire Nutrixeal, nous formulons nos produits en tenant compte des seuils \u00e9tablis par les autorit\u00e9s sanitaires. Ne cumulez pas plusieurs compl\u00e9ments contenant de la vitamine C sans avoir v\u00e9rifi\u00e9 les apports totaux journaliers.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-f2fe3294\"><h3 class=\"uagb-heading-text\">Fractionner les prises de suppl\u00e9ments<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;absorption de l&rsquo;acide ascorbique diminue proportionnellement avec l&rsquo;augmentation de la dose unitaire.\u00a0<sup>[6]<\/sup> Fractionner les apports en deux ou trois prises au cours de la journ\u00e9e optimise l&rsquo;assimilation et limite les troubles digestifs \u00e9ventuels, particuli\u00e8rement avec les formats \u00e0 forte concentration.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-c8a95d29\"><h3 class=\"uagb-heading-text\"><strong>Privil\u00e9gier une forme liposomale en cas de sensibilit\u00e9 digestive<\/strong><\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pour les personnes qui tol\u00e8rent moins bien l\u2019acide ascorbique classique, notamment lorsque les prises sont concentr\u00e9es, une forme liposomale peut \u00eatre envisag\u00e9e. Dans ce type de formulation, la vitamine C est encapsul\u00e9e dans des phospholipides, ce qui modifie son mode d\u2019assimilation et peut rendre la prise plus confortable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Elle ne dispense pas de respecter les quantit\u00e9s recommand\u00e9es, mais elle permet d\u2019adapter la forme gal\u00e9nique au niveau de tol\u00e9rance de chacun.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-bbd53223\"><h3 class=\"uagb-heading-text\">Consulter un professionnel de sant\u00e9 en cas de doute ou de pathologie<\/h3><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Toute prise prolong\u00e9e de doses \u00e9lev\u00e9es m\u00e9rite id\u00e9alement un \u00e9change avec un m\u00e9decin ou un pharmacien, particuli\u00e8rement en pr\u00e9sence d&rsquo;une maladie r\u00e9nale, h\u00e9patique ou m\u00e9tabolique. Les femmes enceintes, les enfants et les personnes sous traitement ont \u00e9galement int\u00e9r\u00eat \u00e0 solliciter un avis m\u00e9dical avant d&rsquo;entamer une cure de vitamine C concentr\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-bb07c47b\"><h2 class=\"uagb-heading-text\">La vitamine C est-elle dangereuse en cas de surdosage&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Pour la majorit\u00e9 des adultes en bonne sant\u00e9, un exc\u00e8s ponctuel ne repr\u00e9sente pas un danger s\u00e9rieux&nbsp;: l&rsquo;organisme \u00e9limine rapidement le surplus par les urines. La toxicit\u00e9 aigu\u00eb reste exceptionnelle. Voici un r\u00e9capitulatif des seuils et de leurs cons\u00e9quences&nbsp;:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Niveau d&rsquo;apport quotidien<\/th><th>Effets observ\u00e9s<\/th><th>Population concern\u00e9e<\/th><\/tr><\/thead><tbody><tr><td>Jusqu&rsquo;\u00e0 110 mg<\/td><td>Apport recommand\u00e9, aucun risque<\/td><td>Adulte en bonne sant\u00e9<\/td><\/tr><tr><td>110 \u00e0 1 000 mg<\/td><td>Bonne tol\u00e9rance g\u00e9n\u00e9rale<\/td><td>Adulte sans pathologie<\/td><\/tr><tr><td>1 000 \u00e0 2 000 mg<\/td><td>Inconforts digestifs possibles<\/td><td>Tous profils<\/td><\/tr><tr><td>Au-del\u00e0 de 2 000 mg<\/td><td>Effets ind\u00e9sirables plus probables<\/td><td>Tous profils, \u00e0 \u00e9viter<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le risque devient r\u00e9el lors de prises chroniques \u00e0 tr\u00e8s fortes doses prolong\u00e9es ou chez les profils sensibles pr\u00e9c\u00e9demment d\u00e9crits.<sup>[3]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-043708f2\"><h2 class=\"uagb-heading-text\">Quand consulter un m\u00e9decin&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Chez l\u2019adulte en bonne sant\u00e9, la vitamine C est g\u00e9n\u00e9ralement tr\u00e8s bien tol\u00e9r\u00e9e lorsqu\u2019elle est utilis\u00e9e \u00e0 des doses adapt\u00e9es. Les inconforts \u00e9ventuellement ressentis sont le plus souvent digestifs et peuvent souvent \u00eatre limit\u00e9s en fractionnant les prises, en ajustant le dosage ou en choisissant une forme liposomale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si un signe inhabituel appara\u00eet, persiste ou suscite un doute, il est pr\u00e9f\u00e9rable de demander l\u2019avis d\u2019un m\u00e9decin ou d\u2019un pharmacien.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une consultation est \u00e9galement recoammand\u00e9e avant la suppl\u00e9mentation lorsque vous pr\u00e9sentez une pathologie chronique ou que suivez un traitement m\u00e9dicamenteux r\u00e9gulier.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-6b032f14\"><h2 class=\"uagb-heading-text\">Faut-il s&rsquo;inqui\u00e9ter d&rsquo;un l\u00e9ger exc\u00e8s de vitamine C&nbsp;?<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Un d\u00e9passement mod\u00e9r\u00e9 et occasionnel des apports recommand\u00e9s ne pr\u00e9sente g\u00e9n\u00e9ralement aucun danger pour un adulte sans pathologie particuli\u00e8re. L&rsquo;organisme dispose de m\u00e9canismes efficaces pour \u00e9liminer le surplus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La vigilance concerne avant tout la chronicit\u00e9&nbsp;: prendre plus de 1 000 mg par jour pendant plusieurs mois cons\u00e9cutifs, sans justification physiologique, n&rsquo;apporte aucun bienfait suppl\u00e9mentaire et expose inutilement aux effets secondaires possibles. La mod\u00e9ration reste la meilleure strat\u00e9gie nutritionnelle.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-794c2d21\"><h2 class=\"uagb-heading-text\">Sources<\/h2><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Office of Dietary Supplements, National Institutes of Health (NIH). Vitamin C &#8211; Fact Sheet for Health Professionals. 2025. Disponible sur&nbsp;: ods.od.nih.gov<\/li>\n\n\n\n<li>ANSES (Agence nationale de s\u00e9curit\u00e9 sanitaire de l&rsquo;alimentation, de l&rsquo;environnement et du travail). Les r\u00e9f\u00e9rences nutritionnelles en vitamines et min\u00e9raux. 2024.<\/li>\n\n\n\n<li>EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). Scientific Opinion on the Tolerable Upper Intake Level of vitamin C. EFSA Journal, 2018.<\/li>\n\n\n\n<li>Haute Autorit\u00e9 de Sant\u00e9 (HAS). Dosage de la vitamine C dans le sang &#8211; Argumentaire. Service \u00e9valuation des actes professionnels, mai 2018.<\/li>\n\n\n\n<li>Rees DC, Kelsey H, Richards JD.&nbsp;BMJ, 1993;306(6881):841-842.<\/li>\n\n\n\n<li>Levine M, Conry-Cantilena C, Wang Y, et al. Vitamin C pharmacokinetics in healthy volunteers: evidence for a recommended dietary allowance. Proceedings of the National Academy of Sciences, 1996;93(8):3704-3709.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La vitamine C reste un nutriment essentiel au fonctionnement de l&rsquo;organisme, mais sa consommation excessive soul\u00e8ve des questions l\u00e9gitimes. &nbsp;Pour mieux comprendre comment adapter vos apports, il est utile de conna\u00eetre les recommandations et les situations qui m\u00e9ritent une attention particuli\u00e8re. Le laboratoire Nutrixeal vous propose un \u00e9clairage complet pour vous aider \u00e0 ajuster votre [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":735,"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":[39],"tags":[],"class_list":["post-573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-vitamine-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Surdosage vitamine C : risques et sympt\u00f4mes \u00e0 conna\u00eetre<\/title>\n<meta name=\"description\" content=\"Surdosage vitamine c : quels sont les risques ? 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