{"id":844,"date":"2026-08-24T13:27:30","date_gmt":"2026-08-24T12:27:30","guid":{"rendered":"https:\/\/www.nutrixeal.fr\/expertise\/?p=844"},"modified":"2026-08-24T13:27:30","modified_gmt":"2026-08-24T12:27:30","slug":"vitamine-c-idees-recues","status":"publish","type":"post","link":"https:\/\/www.nutrixeal.fr\/expertise\/vitamine-c-idees-recues\/","title":{"rendered":"VRAI OU FAUX&nbsp;? Les id\u00e9es re\u00e7ues au sujet de la vitamine C"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La&nbsp;<strong><a href=\"https:\/\/www.nutrixeal.fr\/71-vitamine-c\" target=\"_blank\" rel=\"noreferrer noopener\">vitamine C<\/a><\/strong>, aussi connue sous le nom d&rsquo;<strong>acide L-ascorbique<\/strong>, est souvent entour\u00e9e de&nbsp;<strong>mythes et d\u2019id\u00e9es re\u00e7ues approximatives ou fausses<\/strong>, qui m\u00e9ritent par cons\u00e9quent d\u2019\u00eatre clarifi\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certaines personnes pensent, \u00e0 tort, qu\u2019il ne faut pas prendre de&nbsp;<strong>vitamine C<\/strong>&nbsp;le soir en raison de ses vertus excitantes ou encore qu\u2019elle n\u2019a d\u2019utilit\u00e9 que pour combattre les rhumes&#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Toutes ces id\u00e9es sont bien \u00e9videmment fausses&nbsp;! Le laboratoire Nutrixeal vous livre ses explications sur le sujet.<\/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>La vitamine C souffre encore de nombreuses id\u00e9es re\u00e7ues&nbsp;: non, elle n\u2019est\u00a0<strong>pas excitante<\/strong>, et elle\u00a0<strong>n\u2019emp\u00eache pas de dormir<\/strong>\u00a0. Non plus, l\u2019orange n\u2019est pas la source la plus riche \u2014 des fruits comme l\u2019<strong>ac\u00e9rola<\/strong>\u00a0ou la goyave la d\u00e9passent largement.<\/li>\n\n\n\n<li>Les apports journaliers recommand\u00e9s (80 mg) visent \u00e0 \u00e9viter les carences, mais restent insuffisants pour couvrir les besoins r\u00e9els de l\u2019organisme, notamment en\u00a0<strong>p\u00e9riode de stress<\/strong>, de\u00a0<strong>fatigue<\/strong>\u00a0ou d\u2019<strong>activit\u00e9 intense<\/strong>.<\/li>\n\n\n\n<li>Enfin, toutes les formes de vitamine C ne se valent pas. L\u2019<strong>acide ascorbique libre<\/strong>, l\u2019<strong>Ester-C\u00ae<\/strong>\u00a0ou les formes\u00a0<strong>liposomales<\/strong>\u00a0pr\u00e9sentent des diff\u00e9rences importantes en mati\u00e8re d\u2019assimilation et de tol\u00e9rance digestive.<\/li>\n\n\n\n<li>Mieux conna\u00eetre ces nuances permet de choisir une suppl\u00e9mentation adapt\u00e9e, loin des clich\u00e9s.<\/li>\n<\/ul>\n    <\/div>\r\n\r\n<\/section>\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-7ebc752a\"><h2 class=\"uagb-heading-text\">L\u2019organisme est incapable de produire de la vitamine C<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705&nbsp;<strong>VRAI&nbsp;:<\/strong>&nbsp;Chez l\u2019\u00eatre humain, la vitamine C est&nbsp;<strong>consid\u00e9r\u00e9e comme essentielle<\/strong>&nbsp;\u00e9tant donn\u00e9 que notre organisme est incapable de la synth\u00e9tiser. Il est donc crucial d\u2019apporter la vitamine C quotidiennement par l\u2019alimentation ou la suppl\u00e9mentation&nbsp;!&nbsp;<strong>Une carence prolong\u00e9e en vitamine C peut avoir des effets n\u00e9fastes sur la sant\u00e9<\/strong>&nbsp;et peut entra\u00eener le scorbut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En revanche, la plupart des autres mammif\u00e8res (\u00e0 l\u2019exception notable des primates et des cochons d\u2019inde) ont la facult\u00e9 de synth\u00e9tiser l\u2019acide ascorbique \u00e0 partir du glucose.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-0b4e7416\"><h2 class=\"uagb-heading-text\">La vitamine C emp\u00eache de dormir<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c<strong>&nbsp;FAUX&nbsp;:<\/strong>&nbsp;La vitamine C n\u2019impacte pas le&nbsp;<strong>sommeil<\/strong>&nbsp;contrairement aux id\u00e9es re\u00e7ues sur le sujet. Cependant,&nbsp;<strong>une sensation d\u2019\u00e9nergie accrue peut \u00eatre ressentie<\/strong>&nbsp;chez les personnes en carence de vitamine C commen\u00e7ant une cure. Dans ce cas-l\u00e0, il est pr\u00e9f\u00e9rable de ne pas consommer la vitamine C le soir. En revanche, une fois l\u2019organisme habitu\u00e9 \u00e0 la suppl\u00e9mentation en vitamine C&nbsp;<strong>il n\u2019y a aucune incidence sur l\u2019endormissement et la qualit\u00e9 du sommeil<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-bbe4b8ef\"><h2 class=\"uagb-heading-text\">La vitamine C a des vertus excitantes<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c\u00a0<strong>FAUX&nbsp;:<\/strong> La vitamine C poss\u00e8de la r\u00e9putation d\u2019avoir un effet excitant et coup de fouet sur notre organisme. Bien que la vitamine C agit \u00e0 plusieurs niveaux dans la production d\u2019\u00e9nergie cellulaire,\u00a0<strong>elle n\u2019a pas d\u2019action excitante<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certaines personnes en manque de vitamine C peuvent ressentir&nbsp;<strong>une sensation d\u2019\u00e9nergie&nbsp;au d\u00e9but d\u2019une suppl\u00e9mentation s&rsquo;estompant avec le temps.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette sensation de gain d\u2019\u00e9nergie est notamment li\u00e9e au r\u00f4le de l\u2019acide ascorbique dans bon nombre de r\u00e9actions biochimiques qui aboutissent \u00e0 la lib\u00e9ration de diff\u00e9rents neurotransmetteurs.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-9ae1350c wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img decoding=\"async\" srcset=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_vitalite-1024x576.png ,https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_vitalite.png 780w, https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_vitalite.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_vitalite-1024x576.png\" alt=\"\" class=\"uag-image-847\" width=\"1024\" height=\"576\" title=\"Vitamine_C_vitalite\" loading=\"lazy\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-6a0ba165\"><h2 class=\"uagb-heading-text\">Les apports recommand\u00e9s en vitamine C sont insuffisants pour \u00eatre en bonne sant\u00e9<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705&nbsp;<strong>VRAI&nbsp;:<\/strong>&nbsp;Les&nbsp;<strong>apports recommand\u00e9s de r\u00e9f\u00e9rence<\/strong>&nbsp;(AR) sont fix\u00e9s par le r\u00e8glement europ\u00e9en n\u00b01169\/2011 et sont de&nbsp;<strong>80 mg<\/strong>&nbsp;par jour concernant la vitamine C. Toutefois, ces apports sont calcul\u00e9s sur les apports moyens de la population dans le but d\u2019\u00e9viter une carence prolong\u00e9e et notamment le scorbut. Les apports recommand\u00e9s ne consid\u00e8rent pas le cas sp\u00e9cifique des&nbsp;<strong>sportifs<\/strong>&nbsp;dont les besoins en vitamine C sont accrus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bien qu\u2019\u00e0 l\u2019heure actuelle il n\u2019existe pas encore de consensus sur les apports quotidiens en vitamine C, on consid\u00e8re que&nbsp;<strong>les apports de r\u00e9f\u00e9rence sont bien inf\u00e9rieurs aux r\u00e9els besoins de la population pour profiter des b\u00e9n\u00e9fices sant\u00e9 de la vitamine C.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les mammif\u00e8res, \u00e0 l\u2019exception des primates et des cochons d\u2019Inde, sont capables de synth\u00e9tiser la vitamine C, selon leur besoin, \u00e0 partir du glucose. \u00c0 titre indicatif, pour des mammif\u00e8res de poids comparable \u00e0 l\u2019Homme,&nbsp;<strong>les quantit\u00e9s atteignent plusieurs grammes par jour (loin des 80 mg recommand\u00e9s)<\/strong>. Le laboratoire Nutrixeal conseille ainsi des dosages compris entre 500 mg et 1 g de vitamine C par jour.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-fe6739a0\"><h2 class=\"uagb-heading-text\">L\u2019orange est le fruit le plus riche en vitamine C<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX&nbsp;:<\/strong>&nbsp;La&nbsp;<strong>cerise ac\u00e9rola&nbsp;est le fruit le plus riche en vitamine C<\/strong>&nbsp;(environ 2,9 g\/100g) suivie de la&nbsp;<strong>goyave<\/strong>&nbsp;(492 mg\/100g), des&nbsp;<strong>fruits rouges<\/strong>&nbsp;(87 mg\/100g) et du&nbsp;<strong>kiwi<\/strong>&nbsp;(82 mg\/100g). En comparaison, l\u2019orange poss\u00e8de une teneur d\u2019environ 47 mg\/100g (source CIQUAL).<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-6e923611\"><h2 class=\"uagb-heading-text\">La vitamine C L-ascorbique est l\u00e9vogyre<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c\u00a0<strong>FAUX&nbsp;:<\/strong>\u00a0Il est important de ne pas m\u00e9langer le L de \u201cacide L-ascorbique\u201d faisant r\u00e9f\u00e9rence \u00e0 la disposition dans l\u2019espace de la vitamine C\u00a0<strong>avec la notion de l\u00e9vogyre(-) \/ dextrogyre(+)<\/strong>. En ce sens, il n\u2019a rien \u00e0 voir avec la notion d\u2019activit\u00e9 optique et de pouvoir rotatoire de la vitamine C. La mol\u00e9cule de vitamine C\u00a0<strong>d\u00e9vie la lumi\u00e8re vers la droite, elle est ainsi dextrogyre (+)<\/strong>. Elle n\u2019est donc pas l\u00e9vogyre(-)&nbsp;!<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-22ba29e8\"><h2 class=\"uagb-heading-text\">La biodisponibilit\u00e9 (assimilation) de la vitamine C est la m\u00eame quelle que soit sa forme<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX&nbsp;:<\/strong>&nbsp;La vitamine C existe sous diff\u00e9rentes formes qui ne sont&nbsp;<strong>pas \u00e9quivalentes en termes d\u2019assimilation et d\u2019efficacit\u00e9. La&nbsp;vitamine C liposomale&nbsp;est ainsi nettement plus assimil\u00e9e que la vitamine C classique<\/strong>, sous forme d\u2019acide L-ascorbique libre. De plus, la forme L-ascorbate de calcium dans&nbsp;<strong>Ester-C\u00ae<\/strong>&nbsp;poss\u00e8de \u00e9galement une biodisponibilit\u00e9 sup\u00e9rieure \u00e0 celle de l\u2019acide L-ascorbique dans les leucocytes. Dans diff\u00e9rentes \u00e9tudes, il a notamment \u00e9t\u00e9 d\u00e9montr\u00e9 que l\u2019<strong>Ester-C\u00ae avait une capacit\u00e9 de p\u00e9n\u00e9tration cellulaire sup\u00e9rieure<\/strong>&nbsp;\u00e0 celle de l\u2019acide ascorbique et&nbsp;<strong>une dur\u00e9e de r\u00e9tention cellulaire \u00e9galement plus importante<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-32798b24\"><h2 class=\"uagb-heading-text\">L\u2019assimilation de la vitamine C atteint 100%<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX&nbsp;:&nbsp;<\/strong>Une suppl\u00e9mentation en vitamine C&nbsp;<strong>par voie orale n\u2019atteint jamais 100% d\u2019assimilation<\/strong>&nbsp;m\u00eame pour une forme liposomale. Les transporteurs disponibles pour l\u2019absorption intestinale de la vitamine C ne sont pas tr\u00e8s nombreux, ce qui constitue un challenge technologique pour les fabricants de&nbsp;<strong><a href=\"https:\/\/www.nutrixeal.fr\/2-complements-alimentaires-naturels-francais\">compl\u00e9ments alimentaires<\/a><\/strong>&nbsp;pour optimiser l\u2019assimilation et repousser toujours plus loin le seuil de tol\u00e9rance digestive \u00e0 la vitamine C (seuil qui varie beaucoup d\u2019un individu \u00e0 l\u2019autre).<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3ab4f3f4\"><h2 class=\"uagb-heading-text\">Un exc\u00e8s de vitamine C est dangereux pour la sant\u00e9<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c <strong>FAUX<\/strong> \u2026 \u00e0 nuancer pour le cas particulier des personnes dont le statut martial (taux de fer sanguin) est excessif.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La vitamine C consomm\u00e9e en exc\u00e8s n\u2019est pas dangereuse pour la sant\u00e9, elle est naturellement \u00e9limin\u00e9e par les urines puisqu\u2019il n\u2019existe pas de syst\u00e8me de stockage interne \u00e0 l\u2019organisme. Pour des doses importantes en vitamine C, l\u2019organisme compensera en augmentant l\u2019\u00e9limination urinaire (syst\u00e8me de r\u00e9gulation). Toutefois, un exc\u00e8s de vitamine C peut provoquer des d\u00e9sagr\u00e9ments digestifs passagers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La principale nuance \u00e0 apporter concerne les personnes dont les analyses sanguines r\u00e9v\u00e8lent un taux de fer trop \u00e9lev\u00e9. Une suppl\u00e9mentation en vitamine C est alors d\u00e9conseill\u00e9e en raison du risque de r\u00e9actions pro-oxydantes avec le fer, responsable de la formation de radicaux libres (r\u00e9action de Fenton). On conseille g\u00e9n\u00e9ralement aux personnes concern\u00e9es de compenser l\u2019absence de suppl\u00e9mentation en vitamine C en consommant beaucoup de polyph\u00e9nols (comme les extraits de th\u00e9 vert, qui poss\u00e8dent de surcro\u00eet des propri\u00e9t\u00e9s de captation du fer contenu dans les aliments).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Certains auteurs recommandent \u00e9galement d\u2019\u00e9viter la suppl\u00e9mentation en vitamine C en cas de calculs r\u00e9naux, en raison du risque de m\u00e9tabolisation de l\u2019acide ascorbique en oxalates, susceptible de cristalliser au niveau des glom\u00e9rules r\u00e9naux. Il s\u2019agit l\u00e0 d\u2019un risque th\u00e9orique, qui ne se v\u00e9rifie pas in vivo, en raison de diff\u00e9rents m\u00e9canismes de compensation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Enfin, certains avancent que la vitamine C peut devenir pro-oxydante \u00e0 haute dose. Si ce m\u00e9canisme peut effectivement jouer en cas d\u2019injection intraveineuse de grandes quantit\u00e9s d\u2019ascorbate de sodium (plusieurs dizaines de grammes et m\u00eame plusieurs centaines de gramme par jour dans certains essais cliniques), les quantit\u00e9s de vitamine C absorb\u00e9es par voie orale (m\u00eame en utilisant de la vitamine C liposomale, \u00e0 haute biodisponibilit\u00e9) ne peuvent pas aboutir \u00e0 un effet pro-oxydant. Cette crainte n\u2019est donc pas du tout justifi\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-d58fe786 wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img decoding=\"async\" srcset=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_troubles_osmotiques_intestinaux-1024x576.png ,https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_troubles_osmotiques_intestinaux.png 780w, https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_troubles_osmotiques_intestinaux.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/Vitamine_C_troubles_osmotiques_intestinaux-1024x576.png\" alt=\"\" class=\"uag-image-848\" width=\"1024\" height=\"576\" title=\"Vitamine_C_troubles_osmotiques_intestinaux\" loading=\"lazy\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-95a779ca\"><h2 class=\"uagb-heading-text\">Les vitamines C liposomales peuvent contenir des solvants et des additifs douteux<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705&nbsp;<strong>VRAI&nbsp;:<\/strong>&nbsp;Certains industriels utilisent des solvants organiques dans la production des liposomes servant \u00e0 l\u2019encapsulation de la vitamine C. En revanche,&nbsp;<strong>Nutrixeal n\u2019utilise aucun solvant organique pour produire sa&nbsp;vitamine C liposomale ZetaGreen\u00ae<\/strong>, pas m\u00eame de l\u2019alcool alimentaire. Elle ne contient donc pas de traces de solvants organiques. De plus, certains industriels utilisent des tensioactifs comme le polysorbate 80.&nbsp;<strong>Nutrixeal garantit l\u2019absence de surfactant synth\u00e9tique avec son label ZetaGreen\u00ae<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-9a521b6c\"><h2 class=\"uagb-heading-text\">La vitamine C est surtout un rem\u00e8de miracle contre le rhume<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX &#8230;<\/strong>&nbsp;ou en tout cas, \u00e0 nuancer&nbsp;! Il est courant de penser que la vitamine C est&nbsp;<strong>un rem\u00e8de miracle contre le rhume<\/strong>, mais si elle peut effectivement aider \u00e0 soutenir le syst\u00e8me immunitaire en participant aux&nbsp;<strong>d\u00e9fenses antioxydantes<\/strong>&nbsp;des cellules immunitaires (lymphocytes, macrophages, cellules dendritiques),&nbsp;<strong>il est excessif de la pr\u00e9senter comme un rem\u00e8de \u201cmiracle\u201d<\/strong>. Son efficacit\u00e9 d\u00e9pend beaucoup de celle de notre propre syst\u00e8me immunitaire. Plus notre syst\u00e8me immunitaire est apte \u00e0 combattre un virus (<strong>notion d\u2019immunit\u00e9&nbsp;entra\u00een\u00e9e<\/strong>) et plus la protection antioxydante apport\u00e9e par la vitamine C aux lymphocytes et aux macrophages sera b\u00e9n\u00e9fique et utile pour contribuer \u00e0 l\u2019efficacit\u00e9 de la r\u00e9ponse immunitaire.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par ailleurs,&nbsp;<strong>le r\u00f4le de la vitamine C pour notre organisme est bien plus large<\/strong>&nbsp;que sa seule contribution au bon fonctionnement du syst\u00e8me immunitaire. Elle intervient ainsi, par exemple, dans la&nbsp;<strong>synth\u00e8se du&nbsp;collag\u00e8ne<\/strong>, une prot\u00e9ine structurale pr\u00e9sente dans tous les tissus de soutien de notre organisme&nbsp;: os, cartilages, tendons, etc.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-e88c535a wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img decoding=\"async\" srcset=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/phagocytose_et_vitamine_C-1024x576.png ,https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/phagocytose_et_vitamine_C.png 780w, https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/phagocytose_et_vitamine_C.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/phagocytose_et_vitamine_C-1024x576.png\" alt=\"\" class=\"uag-image-849\" width=\"1024\" height=\"576\" title=\"phagocytose_et_vitamine_C\" loading=\"lazy\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-3585c884\"><h2 class=\"uagb-heading-text\">La vitamine C seule prot\u00e8ge la peau des effets n\u00e9fastes du soleil<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX&nbsp;:<\/strong>&nbsp;Il est courant de croire que la vitamine C seule peut prot\u00e9ger la peau des dommages caus\u00e9s par le soleil. Si elle contribue \u00e0 la photoprotection en raison de son activit\u00e9 antioxydante,&nbsp;<strong>elle ne remplace pas une protection solaire ad\u00e9quate.<\/strong>&nbsp;De plus, certains actifs sont nettement plus efficaces dans la protection des dommages cellulaires caus\u00e9s par les rayons UV tels que&nbsp;<strong>l\u2019astaxanthine&nbsp;dont l\u2019activit\u00e9 antiradicalaire est 6067 fois sup\u00e9rieure \u00e0 celle de la vitamine C<\/strong>&nbsp;(\u00e9tude publi\u00e9e dans la revue Carotenoids Science en 2007 sur la capacit\u00e9 d\u2019interception de l\u2019oxyg\u00e8ne singulet par l\u2019astaxanthine).<\/p>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-acfc6767\"><h2 class=\"uagb-heading-text\">La vitamine C dans les compl\u00e9ments alimentaires est artificielle<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c\u00a0<strong>FAUX&nbsp;:<\/strong> Certes, il est possible de trouver quelquefois sur certains circuits de distribution alternatifs de l\u2019acide ascorbique destin\u00e9 \u00e0 un usage vinicole et constitu\u00e9 d\u2019un m\u00e9lange rac\u00e9mique de DL- acide ascorbique. Or,\u00a0<strong>seule la forme L est biologiquement active<\/strong>\u00a0et ces m\u00e9langes rac\u00e9miques issus d\u2019une synth\u00e8se chimique sym\u00e9trique ne correspondent pas aux normes alimentaires (et ne devraient jamais \u00eatre utilis\u00e9s dans les compl\u00e9ments alimentaires).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, ce type d\u2019acide ascorbique de synth\u00e8se n\u2019est absolument pas repr\u00e9sentatif du march\u00e9 actuel des compl\u00e9ments alimentaires s\u00e9rieux, dans lesquels on trouve en revanche&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Soit de la vitamine C&nbsp;<strong>directement extraite de fruits<\/strong>&nbsp;comme l\u2019ac\u00e9rola (garantie&nbsp;<strong>100% naturelle<\/strong>&nbsp;chez les tous les producteurs s\u00e9rieux).<\/li>\n\n\n\n<li>Soit de la vitamine C tout aussi \u00ab naturelle \u00bb, mais issue d\u2019un processus technologique (<strong>biotechnologies<\/strong>) \u00e0 partir de glucose (de source v\u00e9g\u00e9tale telle que les c\u00e9r\u00e9ales)&nbsp;:\n<ul class=\"wp-block-list\">\n<li>Sous&nbsp;<strong>forme libre directement&nbsp;: acide L-ascorbique<\/strong>, comme dans l\u2019ac\u00e9rola.<\/li>\n\n\n\n<li>Sous&nbsp;<strong>forme de sels de sodium<\/strong>&nbsp;ou&nbsp;<strong>de&nbsp;calcium<\/strong>&nbsp;afin de proposer des formes de&nbsp;<strong>vitamine C \u00e0 pH neutre<\/strong>, avec une \u00e9tape technologique suppl\u00e9mentaire.<\/li>\n\n\n\n<li>Sous des&nbsp;<strong>formes \u00ab premium \u00bb<\/strong>&nbsp;d\u00e9riv\u00e9es des pr\u00e9c\u00e9dentes, telles que l\u2019<strong>Ester-C\u00ae<\/strong>&nbsp;et les&nbsp;<strong>formes liposomales<\/strong>, avec des \u00e9tapes technologiques suppl\u00e9mentaires&nbsp;<strong>destin\u00e9es \u00e0 am\u00e9liorer nettement l\u2019assimilation de la vitamine C<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mais il faut bien comprendre que toutes ces formes sont&nbsp;<strong>d\u00e9riv\u00e9es de l\u2019hydrolyse de l\u2019amidon des c\u00e9r\u00e9ales<\/strong>&nbsp;telles que le ma\u00efs. Ainsi, elles contiennent toutes, sous une forme ou l\u2019autre, de l\u2019<strong>acide L-ascorbique biologiquement actif et rigoureusement bio-identique<\/strong>&nbsp;\u00e0 l\u2019acide L-ascorbique contenu dans les fruits et l\u00e9gumes. En r\u00e9alit\u00e9, toutes ces formes sont donc&nbsp;<strong>tout aussi \u00ab naturelles \u00bb<\/strong>&nbsp;les unes que les autres, m\u00eame si certaines font appel \u00e0 des \u00e9tapes de transformation plus technologiques qu\u2019une simple extraction aqueuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En r\u00e9sum\u00e9, les&nbsp;<strong>compl\u00e9ments alimentaires s\u00e9rieux pr\u00e9sents sur le march\u00e9 contiennent tous de la vitamine C naturelle<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-uagb-image aligncenter uagb-block-5790a41c wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-center\"><figure class=\"wp-block-uagb-image__figure\"><img decoding=\"async\" srcset=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/differentes_formes_vitamine_C8complements_alimentaires.png ,https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/differentes_formes_vitamine_C8complements_alimentaires.png 780w, https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/differentes_formes_vitamine_C8complements_alimentaires.png 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/nutrixeal.b-cdn.net\/expertise\/wp-content\/uploads\/2026\/07\/differentes_formes_vitamine_C8complements_alimentaires.png\" alt=\"\" class=\"uag-image-850\" width=\"576\" height=\"576\" title=\"differentes_formes_vitamine_C8complements_alimentaires\" loading=\"lazy\" role=\"img\"\/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-uagb-advanced-heading uagb-block-6662bd24\"><h2 class=\"uagb-heading-text\">La vitamine C artificielle est moins bien assimil\u00e9e que la vitamine C naturelle<\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c&nbsp;<strong>FAUX&nbsp;:&nbsp;<\/strong>Comme expliqu\u00e9 pr\u00e9c\u00e9demment, les formes de vitamine C pr\u00e9sentes sur le march\u00e9 des compl\u00e9ments alimentaires ont&nbsp;<strong>une origine plus ou moins technologique<\/strong>, de la simple extraction aqueuse \u00e0 la biofermentation, mais&nbsp;<strong>toutes sont \u00ab naturelles \u00bb<\/strong>,&nbsp;<strong>car bio-identiques<\/strong>&nbsp;\u00e0 l\u2019acide L-ascorbique pr\u00e9sent dans les fruits et les l\u00e9gumes frais.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent, contrairement aux id\u00e9es re\u00e7ues,&nbsp;<strong>la vitamine C \u00ab artificielle \u00bb est virtuellement absente du monde des compl\u00e9ments alimentaires.<\/strong><br>Les \u00e9tapes technologiques telles que la formation de m\u00e9tabolites (pour l\u2019<strong>Ester-C\u00ae<\/strong>) ou l\u2019encapsulation liposomale sont destin\u00e9es&nbsp;<strong>\u00e0 am\u00e9liorer l\u2019assimilation, la p\u00e9n\u00e9tration cellulaire et la tol\u00e9rance intestinale&nbsp;<\/strong>de la vitamine C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par cons\u00e9quent,&nbsp;<strong>les vitamines C les plus \u00ab technologiques \u00bb (telles que l\u2019Ester-C\u00ae ou la vitamine C liposomale) sont en r\u00e9alit\u00e9 plus assimilables et nettement plus biodisponibles que l\u2019acide ascorbique libre de l\u2019ac\u00e9rola.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les extraits d\u2019ac\u00e9rola propos\u00e9s par le laboratoire Nutrixeal constituent incontestablement&nbsp;une forme \u201csympathique\u201d d\u2019apport en vitamine C.&nbsp;En effet, elles n\u00e9cessitent peu d\u2019\u00e9tapes technologiques et contiennent conjointement des&nbsp;bioflavono\u00efdes synergiques&nbsp;naturellement pr\u00e9sents dans les fruits. En revanche,&nbsp;la biodisponibilit\u00e9 de ce type d\u2019extrait reste inf\u00e9rieure \u00e0 celle de formes technologiques plus \u00ab premium \u00bb&nbsp;telles que l\u2019Ester-C\u00ae Phytocomplex liposomale&nbsp;ou la&nbsp;vitamine C Quali-C\u00ae liposomale Zetagreen\u00ae. Ces derni\u00e8res sont&nbsp;mieux tol\u00e9r\u00e9es et mieux absorb\u00e9es par le syst\u00e8me digestif. La diff\u00e9rence est peu marqu\u00e9e pour de faibles apports en vitamine C, mais devient de plus en plus perceptible dans de doses plus importantes.<\/p>\n\n\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>La&nbsp;vitamine C, aussi connue sous le nom d&rsquo;acide L-ascorbique, est souvent entour\u00e9e de&nbsp;mythes et d\u2019id\u00e9es re\u00e7ues approximatives ou fausses, qui m\u00e9ritent par cons\u00e9quent d\u2019\u00eatre clarifi\u00e9es. Certaines personnes pensent, \u00e0 tort, qu\u2019il ne faut pas prendre de&nbsp;vitamine C&nbsp;le soir en raison de ses vertus excitantes ou encore qu\u2019elle n\u2019a d\u2019utilit\u00e9 que pour combattre les rhumes&#8230; Toutes [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1069,"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-844","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>Vitamine C : vrai ou faux sur les id\u00e9es re\u00e7ues<\/title>\n<meta name=\"description\" content=\"Faut-il \u00e9viter la vitamine C le soir ? 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scientifique Nutrixeal","author_link":"https:\/\/www.nutrixeal.fr\/expertise\/author\/equipe-scientifique\/"},"uagb_comment_info":0,"uagb_excerpt":"La&nbsp;vitamine C, aussi connue sous le nom d&rsquo;acide L-ascorbique, est souvent entour\u00e9e de&nbsp;mythes et d\u2019id\u00e9es re\u00e7ues approximatives ou fausses, qui m\u00e9ritent par cons\u00e9quent d\u2019\u00eatre clarifi\u00e9es. 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