{"id":24093,"date":"2025-02-16T08:30:00","date_gmt":"2025-02-16T07:30:00","guid":{"rendered":"https:\/\/www.beautydecoded.com\/?p=24093"},"modified":"2025-02-15T21:54:24","modified_gmt":"2025-02-15T20:54:24","slug":"this-battle-between-vitamin-c-and-niacinamide-will-change-everything-in-your-beauty-routine","status":"publish","type":"post","link":"https:\/\/www.beautydecoded.com\/en\/ce-combat-entre-vitamine-c-et-niacinamide-va-tout-changer-dans-votre-routine-beaute\/","title":{"rendered":"Vitamin C or Niacinamide: Which is the best active ingredient? The answer could change your beauty routine."},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/12\/great-skincare-starts-at-home-1024x760.jpg\" alt=\"Great skincare starts at home\" class=\"wp-image-22919\"\/><figcaption class=\"wp-element-caption\">Great skincare starts at home<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Les cosm\u00e9tiques regorgent aujourd\u2019hui d\u2019ingr\u00e9dients promettant monts et merveilles, mais deux d\u2019entre eux sortent particuli\u00e8rement du lot : la vitamine C (pure ou sous forme de d\u00e9riv\u00e9s) et la vitamine B3, plus connue sous le nom de niacinamide. Anti-\u00e2ge, anti-imperfections, anti-taches\u2026 Ils semblent tout faire. Pourtant, choisir le mauvais actif peut s\u2019av\u00e9rer non seulement inefficace, mais aussi risqu\u00e9 pour votre peau. <\/p>\n\n\n\n<div class=\"wp-block-data443-irp-shortcode irp-shortcode\"><\/div>\n\n\n\n<blockquote class=\"instagram-media\" data-instgrm-captioned data-instgrm-permalink=\"https:\/\/www.instagram.com\/reel\/C_VXDeqIapL\/?utm_source=ig_embed&amp;utm_campaign=loading\" data-instgrm-version=\"14\" style=\" background:#FFF; border:0; border-radius:3px; box-shadow:0 0 1px 0 rgba(0,0,0,0.5),0 1px 10px 0 rgba(0,0,0,0.15); margin: 1px; max-width:540px; min-width:326px; padding:0; width:99.375%; width:-webkit-calc(100% - 2px); width:calc(100% - 2px);\"><div style=\"padding:16px;\"> <a href=\"https:\/\/www.instagram.com\/reel\/C_VXDeqIapL\/?utm_source=ig_embed&amp;utm_campaign=loading\" style=\" background:#FFFFFF; line-height:0; padding:0 0; text-align:center; text-decoration:none; width:100%;\" target=\"_blank\" rel=\"noopener\"> <div style=\" display: flex; flex-direction: row; align-items: center;\"> <div style=\"background-color: #F4F4F4; border-radius: 50%; flex-grow: 0; height: 40px; margin-right: 14px; width: 40px;\"><\/div> <div style=\"display: flex; flex-direction: column; flex-grow: 1; justify-content: center;\"> <div style=\" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 100px;\"><\/div> <div style=\" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; width: 60px;\"><\/div><\/div><\/div><div style=\"padding: 19% 0;\"><\/div> <div style=\"display:block; height:50px; margin:0 auto 12px; width:50px;\"><svg width=\"50px\" height=\"50px\" viewBox=\"0 0 60 60\" version=\"1.1\" xmlns=\"https:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"https:\/\/www.w3.org\/1999\/xlink\"><g stroke=\"none\" stroke-width=\"1\" fill=\"none\" fill-rule=\"evenodd\"><g transform=\"translate(-511.000000, -20.000000)\" fill=\"#000000\"><g><path d=\"M556.869,30.41 C554.814,30.41 553.148,32.076 553.148,34.131 C553.148,36.186 554.814,37.852 556.869,37.852 C558.924,37.852 560.59,36.186 560.59,34.131 C560.59,32.076 558.924,30.41 556.869,30.41 M541,60.657 C535.114,60.657 530.342,55.887 530.342,50 C530.342,44.114 535.114,39.342 541,39.342 C546.887,39.342 551.658,44.114 551.658,50 C551.658,55.887 546.887,60.657 541,60.657 M541,33.886 C532.1,33.886 524.886,41.1 524.886,50 C524.886,58.899 532.1,66.113 541,66.113 C549.9,66.113 557.115,58.899 557.115,50 C557.115,41.1 549.9,33.886 541,33.886 M565.378,62.101 C565.244,65.022 564.756,66.606 564.346,67.663 C563.803,69.06 563.154,70.057 562.106,71.106 C561.058,72.155 560.06,72.803 558.662,73.347 C557.607,73.757 556.021,74.244 553.102,74.378 C549.944,74.521 548.997,74.552 541,74.552 C533.003,74.552 532.056,74.521 528.898,74.378 C525.979,74.244 524.393,73.757 523.338,73.347 C521.94,72.803 520.942,72.155 519.894,71.106 C518.846,70.057 518.197,69.06 517.654,67.663 C517.244,66.606 516.755,65.022 516.623,62.101 C516.479,58.943 516.448,57.996 516.448,50 C516.448,42.003 516.479,41.056 516.623,37.899 C516.755,34.978 517.244,33.391 517.654,32.338 C518.197,30.938 518.846,29.942 519.894,28.894 C520.942,27.846 521.94,27.196 523.338,26.654 C524.393,26.244 525.979,25.756 528.898,25.623 C532.057,25.479 533.004,25.448 541,25.448 C548.997,25.448 549.943,25.479 553.102,25.623 C556.021,25.756 557.607,26.244 558.662,26.654 C560.06,27.196 561.058,27.846 562.106,28.894 C563.154,29.942 563.803,30.938 564.346,32.338 C564.756,33.391 565.244,34.978 565.378,37.899 C565.522,41.056 565.552,42.003 565.552,50 C565.552,57.996 565.522,58.943 565.378,62.101 M570.82,37.631 C570.674,34.438 570.167,32.258 569.425,30.349 C568.659,28.377 567.633,26.702 565.965,25.035 C564.297,23.368 562.623,22.342 560.652,21.575 C558.743,20.834 556.562,20.326 553.369,20.18 C550.169,20.033 549.148,20 541,20 C532.853,20 531.831,20.033 528.631,20.18 C525.438,20.326 523.257,20.834 521.349,21.575 C519.376,22.342 517.703,23.368 516.035,25.035 C514.368,26.702 513.342,28.377 512.574,30.349 C511.834,32.258 511.326,34.438 511.181,37.631 C511.035,40.831 511,41.851 511,50 C511,58.147 511.035,59.17 511.181,62.369 C511.326,65.562 511.834,67.743 512.574,69.651 C513.342,71.625 514.368,73.296 516.035,74.965 C517.703,76.634 519.376,77.658 521.349,78.425 C523.257,79.167 525.438,79.673 528.631,79.82 C531.831,79.965 532.853,80.001 541,80.001 C549.148,80.001 550.169,79.965 553.369,79.82 C556.562,79.673 558.743,79.167 560.652,78.425 C562.623,77.658 564.297,76.634 565.965,74.965 C567.633,73.296 568.659,71.625 569.425,69.651 C570.167,67.743 570.674,65.562 570.82,62.369 C570.966,59.17 571,58.147 571,50 C571,41.851 570.966,40.831 570.82,37.631\"><\/path><\/g><\/g><\/g><\/svg><\/div><div style=\"padding-top: 8px;\"> <div style=\" color:#3897f0; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:550; line-height:18px;\">Voir cette publication sur Instagram<\/div><\/div><div style=\"padding: 12.5% 0;\"><\/div> <div style=\"display: flex; flex-direction: row; margin-bottom: 14px; align-items: center;\"><div> <div style=\"background-color: #F4F4F4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(0px) translateY(7px);\"><\/div> <div style=\"background-color: #F4F4F4; height: 12.5px; transform: rotate(-45deg) translateX(3px) translateY(1px); width: 12.5px; flex-grow: 0; margin-right: 14px; margin-left: 2px;\"><\/div> <div style=\"background-color: #F4F4F4; border-radius: 50%; height: 12.5px; width: 12.5px; transform: translateX(9px) translateY(-18px);\"><\/div><\/div><div style=\"margin-left: 8px;\"> <div style=\" background-color: #F4F4F4; border-radius: 50%; flex-grow: 0; height: 20px; width: 20px;\"><\/div> <div style=\" width: 0; height: 0; border-top: 2px solid transparent; border-left: 6px solid #f4f4f4; border-bottom: 2px solid transparent; transform: translateX(16px) translateY(-4px) rotate(30deg)\"><\/div><\/div><div style=\"margin-left: auto;\"> <div style=\" width: 0px; border-top: 8px solid #F4F4F4; border-right: 8px solid transparent; transform: translateY(16px);\"><\/div> <div style=\" background-color: #F4F4F4; flex-grow: 0; height: 12px; width: 16px; transform: translateY(-4px);\"><\/div> <div style=\" width: 0; height: 0; border-top: 8px solid #F4F4F4; border-left: 8px solid transparent; transform: translateY(-4px) translateX(8px);\"><\/div><\/div><\/div> <div style=\"display: flex; flex-direction: column; flex-grow: 1; justify-content: center; margin-bottom: 24px;\"> <div style=\" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; margin-bottom: 6px; width: 224px;\"><\/div> <div style=\" background-color: #F4F4F4; border-radius: 4px; flex-grow: 0; height: 14px; width: 144px;\"><\/div><\/div><\/a><p style=\" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; line-height:17px; margin-bottom:0; margin-top:8px; overflow:hidden; padding:8px 0 7px; text-align:center; text-overflow:ellipsis; white-space:nowrap;\"><a href=\"https:\/\/www.instagram.com\/reel\/C_VXDeqIapL\/?utm_source=ig_embed&amp;utm_campaign=loading\" style=\" color:#c9c8cd; font-family:Arial,sans-serif; font-size:14px; font-style:normal; font-weight:normal; line-height:17px; text-decoration:none;\" target=\"_blank\" rel=\"noopener\">Une publication partag\u00e9e par Beautydecoded (@skincaredecoded)<\/a><\/p><\/div><\/blockquote>\n<script async src=\"\/\/www.instagram.com\/embed.js\"><\/script>\n\n\n\n<h2 class=\"wp-block-heading\">1. Vitamine C : pure et d\u00e9riv\u00e9s<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1.1. La vitamine C pure (acide ascorbique)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Haute efficacit\u00e9 mais instabilit\u00e9 marqu\u00e9e<\/strong> : l\u2019acide ascorbique est l\u2019actif le plus \u00e9tudi\u00e9 de tous les antioxydants. Ses effets sont remarquablement document\u00e9s, notamment pour la pr\u00e9vention du vieillissement cutan\u00e9 et la stimulation de la production de collag\u00e8ne. Cependant, la vitamine C pure est tr\u00e8s sensible \u00e0 la lumi\u00e8re, \u00e0 l\u2019air et \u00e0 la chaleur. Une fois oxyd\u00e9e (le soin vire alors \u00e0 l\u2019orange fonc\u00e9 ou au brun), elle perd en grande partie de son efficacit\u00e9 et doit \u00eatre jet\u00e9e.<\/li>\n\n\n\n<li><strong>P\u00e9n\u00e9tration cutan\u00e9e d\u00e9licate<\/strong> : la vitamine C \u00e9tant hydrophile, elle p\u00e9n\u00e8tre difficilement la barri\u00e8re cutan\u00e9e naturellement riche en lipides. Pour am\u00e9liorer son absorption, de nombreux s\u00e9rums sont formul\u00e9s \u00e0 pH acide ou contiennent des solvants (alcool, silicones) qui peuvent irriter les peaux sensibles.<\/li>\n\n\n\n<li><strong>Un r\u00f4le cl\u00e9 dans la synth\u00e8se du collag\u00e8ne<\/strong> : sans vitamine C, impossible de produire du collag\u00e8ne. De nombreuses \u00e9tudes montrent qu\u2019une application topique de vitamine C pure favorise la synth\u00e8se de nouvelles fibres de collag\u00e8ne et am\u00e9liore l\u2019apparence des rides.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">1.2. Les d\u00e9riv\u00e9s de la vitamine C<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stabilit\u00e9 renforc\u00e9e, tol\u00e9rance am\u00e9lior\u00e9e<\/strong> : pour surmonter les probl\u00e8mes d\u2019instabilit\u00e9 et d\u2019irritation, des d\u00e9riv\u00e9s de la vitamine C (ex. ascorbyl glucoside, sodium ascorbyl phosphate, etc.) ont \u00e9t\u00e9 d\u00e9velopp\u00e9s. Ils sont plus stables, moins irritants et donc plus adapt\u00e9s aux peaux sensibles.<\/li>\n\n\n\n<li><strong>Des \u00e9tudes en progression<\/strong> : bien que les premiers r\u00e9sultats scientifiques sur les d\u00e9riv\u00e9s soient prometteurs, il reste encore des interrogations concernant leur taux r\u00e9el de conversion en vitamine C pure dans la peau et leur efficacit\u00e9 antioxydante.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"844\" src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-1024x844.jpg\" alt=\"\" class=\"wp-image-24095\" srcset=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-1024x844.jpg 1024w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-300x247.jpg 300w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-768x633.jpg 768w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-1536x1266.jpg 1536w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-scaled.jpg 2048w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-15x12.jpg 15w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/02\/vitamine-c-pure-ou-derive-600x495.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Niacinamide : la touche de douceur multifonctions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La niacinamide (ou vitamine B3) n\u2019a rien \u00e0 envier \u00e0 la vitamine C. Certes, elle ne participe pas directement \u00e0 la fabrication du collag\u00e8ne, mais elle poss\u00e8de d\u2019autres avantages incontournables :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Action anti-imperfections<\/strong> : la niacinamide exerce un effet \u00ab bact\u00e9riostatique \u00bb contre Cutibacterium acnes, la bact\u00e9rie responsable de l\u2019acn\u00e9. Une \u00e9tude a m\u00eame montr\u00e9 une efficacit\u00e9 comparable \u00e0 celle d\u2019un antibiotique topique (la clindamycine) sur les boutons, sans risque de r\u00e9sistance.<\/li>\n\n\n\n<li><strong>Renforcement de la barri\u00e8re cutan\u00e9e<\/strong> : la niacinamide stimule la production de c\u00e9ramides et d\u2019autres lipides essentiels, r\u00e9duisant ainsi la perte en eau et pr\u00e9venant les rougeurs (rosac\u00e9e, dermatite atopique, etc.).<\/li>\n\n\n\n<li><strong>Action anti-\u00e2ge<\/strong> : bien qu\u2019elle n\u2019agisse pas comme la vitamine C sur la synth\u00e8se du collag\u00e8ne, elle aide \u00e0 pr\u00e9server l\u2019int\u00e9grit\u00e9 des fibres de collag\u00e8ne et d\u2019\u00e9lastine en r\u00e9duisant l\u2019activit\u00e9 des enzymes qui les d\u00e9gradent. De plus, elle a des propri\u00e9t\u00e9s anti-glycation pour \u00e9viter le teint terne.<\/li>\n\n\n\n<li><strong>Action sur les taches<\/strong> : elle limite le transfert de la m\u00e9lanine vers les couches sup\u00e9rieures de la peau, ce qui permet d\u2019att\u00e9nuer l\u2019hyperpigmentation.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"VITAMINE C vs NIACINAMIDE: vous DEVEZ choisir le meilleur !\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/p7VcneY04No?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Comparatif th\u00e9matique : qui gagne le match ?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1. Pr\u00e9vention (action antioxydante)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gagnant : vitamine C pure<\/strong><br>La vitamine C pure est l\u2019un des meilleurs antioxydants topiques valid\u00e9s par la science. Juste derri\u00e8re, le niacinamide se d\u00e9fend bien, mais reste moins puissant pour lutter contre les radicaux libres. Les d\u00e9riv\u00e9s de vitamine C ont, pour l\u2019heure, un niveau de preuve un peu moins solide que la forme pure.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.2. Anti-\u00e2ge (rides, fermet\u00e9)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gagnant : vitamine C pure<\/strong><br>Gr\u00e2ce \u00e0 son r\u00f4le cl\u00e9 dans la synth\u00e8se du collag\u00e8ne, l\u2019acide ascorbique est un ingr\u00e9dient de choix pour combattre le vieillissement cutan\u00e9. La niacinamide stimule aussi la production de collag\u00e8ne, mais de fa\u00e7on moins directe. Les d\u00e9riv\u00e9s de la vitamine C sont prometteurs, mais encore moins \u00e9tudi\u00e9s \u00e0 ce jour.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.3. Acn\u00e9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gagnant : niacinamide<\/strong><br>La vitamine C n\u2019est pas la meilleure alli\u00e9e pour traiter l\u2019acn\u00e9 elle-m\u00eame (m\u00eame si elle peut aider \u00e0 diminuer les taches post-inflammatoires). La niacinamide, en revanche, poss\u00e8de une activit\u00e9 sp\u00e9cifique contre la bact\u00e9rie responsable de l\u2019acn\u00e9, en plus d\u2019am\u00e9liorer la fonction barri\u00e8re et d\u2019apaiser la peau. Les d\u00e9riv\u00e9s de la vitamine C arrivent en second choix, notamment pour att\u00e9nuer les marques r\u00e9siduelles.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.4. Taches d\u2019hyperpigmentation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gagnant : vitamine C pure<\/strong><br>Elle agit en inhibant l\u2019enzyme tyrosinase, ce qui freine la production de m\u00e9lanine. La niacinamide, quant \u00e0 elle, diminue le transfert de la m\u00e9lanine. Sur ce point pr\u00e9cis, la forme pure de la vitamine C s\u2019impose encore. Les d\u00e9riv\u00e9s de vitamine C restent une bonne option pour les peaux sensibles, et la niacinamide compl\u00e8te tr\u00e8s bien les routines anti-taches.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.5. Rougeurs et peaux sensibles<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gagnant : niacinamide<\/strong><br>En stimulant la production de c\u00e9ramides et en renfor\u00e7ant la barri\u00e8re cutan\u00e9e, la niacinamide est id\u00e9ale pour apaiser les rougeurs et limiter l\u2019\u00e9ryth\u00e8me, notamment dans le cadre de la rosac\u00e9e, la dermatite atopique ou l\u2019acn\u00e9. La vitamine C pure peut, au contraire, s\u2019av\u00e9rer irritante, surtout si le s\u00e9rum est formul\u00e9 \u00e0 pH acide. Les d\u00e9riv\u00e9s de vitamine C, moins agressifs, se placent en deuxi\u00e8me position pour les peaux d\u00e9licates.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Quelques conseils pratiques<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1. \u00c0 retenir si vous avez la peau sensible<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c9vitez de combiner r\u00e9tinol et vitamine C pure dans la m\u00eame routine (r\u00e9tinol le soir et vitamine C le matin) si vous \u00eates sujet\u00b7te aux irritations.<\/li>\n\n\n\n<li>Choisissez plut\u00f4t un d\u00e9riv\u00e9 de vitamine C moins agressif ou tournez-vous vers la niacinamide pour une routine plus douce.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4.2. R\u00e9actions ind\u00e9sirables ?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le niacinamide est g\u00e9n\u00e9ralement tr\u00e8s bien tol\u00e9r\u00e9, mais certaines personnes peuvent ressentir un \u201cflush\u201d temporaire apr\u00e8s application.<\/li>\n\n\n\n<li>Les irritations sont parfois li\u00e9es \u00e0 d\u2019autres ingr\u00e9dients pr\u00e9sents dans les formules (solvants, tensioactifs, conservateurs\u2026), et non forc\u00e9ment au niacinamide ou \u00e0 la vitamine C en elle-m\u00eame.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4.3. Astuce pour identifier la vitamine C utilis\u00e9e<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>D\u00e9cryptez la liste INCI<\/strong> : recherchez le terme \u00ab ascorbic acid \u00bb (pour la forme pure) ou d\u2019autres noms (ascorbyl glucoside, sodium ascorbyl phosphate, etc.) pour les d\u00e9riv\u00e9s.<\/li>\n\n\n\n<li><strong>Utilisez une application scan<\/strong> : certains outils comme <em>BeautyDecoded<\/em> (en d\u00e9veloppement) vous permettront de conna\u00eetre la forme pr\u00e9cise de vitamine C dans votre s\u00e9rum et sa concentration.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Conclusion : quel est le meilleur actif ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sur la base des \u00e9tudes scientifiques (et d\u2019une petite mise en sc\u00e8ne fa\u00e7on \u00ab match en 5 manches \u00bb), la vitamine C pure l\u2019emporte de justesse avec trois victoires (pr\u00e9vention antioxydante, anti-\u00e2ge et anti-taches) contre deux (acn\u00e9 et rougeurs) pour la niacinamide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Toutefois, le plus important est de choisir l\u2019ingr\u00e9dient adapt\u00e9 \u00e0 VOTRE peau.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si vous avez une peau sensible ou sujette aux rougeurs, le niacinamide reste plus s\u00fbr.<\/li>\n\n\n\n<li>Si votre principal souci est le vieillissement cutan\u00e9 ou la pigmentation (taches brunes, teint terne), alors un bon s\u00e9rum \u00e0 la vitamine C pure, bien formul\u00e9 et bien conserv\u00e9, peut faire des merveilles.<\/li>\n\n\n\n<li>En cas de peau mixte \u00e0 grasse avec des imperfections, le choix logique s\u2019oriente vers la niacinamide.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Enfin, gardez \u00e0 l\u2019esprit que chaque peau r\u00e9agit diff\u00e9remment. N\u2019h\u00e9sitez pas \u00e0 proc\u00e9der \u00e0 des essais, \u00e0 adapter les dosages et \u00e0 consulter un\u00b7e professionnel\u00b7le si n\u00e9cessaire. Et surtout, prot\u00e9gez-vous du soleil avec un \u00e9cran solaire \u00e0 large spectre : c\u2019est la meilleure base d\u2019une routine anti-\u00e2ge et anti-taches r\u00e9ussie !<\/p>\n\n\n<style>.kb-row-layout-id24093_008535-79 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id24093_008535-79 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id24093_008535-79 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-none, 0rem );max-width:var( --global-content-width, 1290px );padding-left:var(--global-content-edge-padding);padding-right:var(--global-content-edge-padding);padding-top:121px;padding-bottom:97px;grid-template-columns:minmax(0, calc(55.5% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(44.5% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id24093_008535-79 > .kt-row-layout-overlay{opacity:0.70;background-image:url('https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/12\/avis-app-beautydecoded.jpg');background-size:cover;background-position:61% 0%;background-attachment:scroll;background-repeat:no-repeat;}.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep{height:174px;}.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep svg{width:132%;}.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep svg{fill:var(--global-palette9, #ffffff)!important;}.kb-row-layout-id24093_008535-79 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id24093_008535-79 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id24093_008535-79 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id24093_008535-79 > .kt-row-column-wrap{padding-top:170px;padding-right:20px;padding-bottom:100px;padding-left:20px;grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 1024px){.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id24093_008535-79 > .kt-row-column-wrap{padding-top:110px;padding-right:20px;padding-bottom:50px;padding-left:20px;grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id24093_008535-79 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id24093_008535-79 alignfull has-theme-palette8-background-color kt-row-has-bg wp-block-kadence-rowlayout\"><div class=\"kt-row-layout-overlay kt-row-overlay-normal\"><\/div><div class=\"kt-row-layout-bottom-sep kt-row-sep-type-crvli\"><svg viewBox=\"0 0 1000 100\" preserveAspectRatio=\"none\"><path d=\"M1000,0c0,0 -420.987,98 -650,98c-229.013,0 -350,-98 -350,-98l0,100l1000,0l0,-100Z\" \/><\/svg><\/div><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-row kt-mobile-layout-row kt-row-valign-top kb-theme-content-width\">\n<style>.kadence-column24093_71501a-5f > .kt-inside-inner-col{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kadence-column24093_71501a-5f > .kt-inside-inner-col,.kadence-column24093_71501a-5f > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column24093_71501a-5f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column24093_71501a-5f > .kt-inside-inner-col{flex-direction:column;}.kadence-column24093_71501a-5f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column24093_71501a-5f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column24093_71501a-5f{position:relative;}@media all and (max-width: 1024px){.kadence-column24093_71501a-5f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column24093_71501a-5f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column24093_71501a-5f inner-column-1\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d, .wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d[data-kb-block=\"kb-adv-heading24093_b26902-2d\"]{margin-top:-20px;margin-bottom:43px;font-size:4em;line-height:1em;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d[data-kb-block=\"kb-adv-heading24093_b26902-2d\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d[data-kb-block=\"kb-adv-heading24093_b26902-2d\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d, .wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d[data-kb-block=\"kb-adv-heading24093_b26902-2d\"]{font-size:3.2em;text-align:center!important;}}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d, .wp-block-kadence-advancedheading.kt-adv-heading24093_b26902-2d[data-kb-block=\"kb-adv-heading24093_b26902-2d\"]{font-size:2.2em;}}<\/style>\n<h1 class=\"kt-adv-heading24093_b26902-2d wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading24093_b26902-2d\">Faites les bons choix pour votre peau<\/h1>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b, .wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b[data-kb-block=\"kb-adv-heading24093_8c7c7c-8b\"]{margin-bottom:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b[data-kb-block=\"kb-adv-heading24093_8c7c7c-8b\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b[data-kb-block=\"kb-adv-heading24093_8c7c7c-8b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b, .wp-block-kadence-advancedheading.kt-adv-heading24093_8c7c7c-8b[data-kb-block=\"kb-adv-heading24093_8c7c7c-8b\"]{text-align:center!important;}}<\/style>\n<p class=\"kt-adv-heading24093_8c7c7c-8b wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading24093_8c7c7c-8b\">Dites adieu aux d\u00e9penses inutiles et <strong>obtenez des r\u00e9sultats visibles!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Notre <strong>intelligence artificielle<\/strong> vous recommande des cosm\u00e9tiques personnalis\u00e9s.<\/p>\n\n\n<style>.kb-row-layout-id24093_b171b7-5e > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id24093_b171b7-5e > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id24093_b171b7-5e > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:var(--global-kb-spacing-xxs, 0.5rem);padding-bottom:var(--global-kb-spacing-xxs, 0.5rem);grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id24093_b171b7-5e > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id24093_b171b7-5e > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id24093_b171b7-5e > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id24093_b171b7-5e aligncenter wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column24093_02be12-a9 > .kt-inside-inner-col,.kadence-column24093_02be12-a9 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:20px;border-bottom-right-radius:0px;border-bottom-left-radius:20px;}.kadence-column24093_02be12-a9 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column24093_02be12-a9 > .kt-inside-inner-col{flex-direction:column;}.kadence-column24093_02be12-a9 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column24093_02be12-a9 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column24093_02be12-a9{position:relative;}@media all and (max-width: 1024px){.kadence-column24093_02be12-a9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column24093_02be12-a9 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column24093_02be12-a9\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/apps.apple.com\/fr\/app\/beauty-decoded-scan-produits\/id6448793828\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" width=\"210\" height=\"65\" src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-apple-store.webp\" alt=\"\" class=\"wp-image-22337\" srcset=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-apple-store.webp 210w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-apple-store-18x6.webp 18w\" sizes=\"(max-width: 210px) 100vw, 210px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n\n\n<style>.kadence-column24093_602c7a-66 > .kt-inside-inner-col,.kadence-column24093_602c7a-66 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:20px;border-bottom-right-radius:0px;border-bottom-left-radius:20px;}.kadence-column24093_602c7a-66 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column24093_602c7a-66 > .kt-inside-inner-col{flex-direction:column;}.kadence-column24093_602c7a-66 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column24093_602c7a-66 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column24093_602c7a-66{position:relative;}@media all and (max-width: 1024px){.kadence-column24093_602c7a-66 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column24093_602c7a-66 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column24093_602c7a-66\"><div class=\"kt-inside-inner-col\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.app.beautydecoded\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" width=\"208\" height=\"60\" src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-google-store.webp\" alt=\"\" class=\"wp-image-22338\" srcset=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-google-store.webp 208w, https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/10\/beautydecoded-google-store-18x5.webp 18w\" sizes=\"(max-width: 208px) 100vw, 208px\" \/><\/a><\/figure>\n<\/div><\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n<style>.kadence-column24093_981c2a-76 > .kt-inside-inner-col{padding-top:10px;padding-right:10px;padding-bottom:10px;padding-left:10px;}.kadence-column24093_981c2a-76 > .kt-inside-inner-col,.kadence-column24093_981c2a-76 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column24093_981c2a-76 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column24093_981c2a-76 > .kt-inside-inner-col{flex-direction:column;}.kadence-column24093_981c2a-76 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column24093_981c2a-76 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column24093_981c2a-76{position:relative;}@media all and (max-width: 1024px){.kadence-column24093_981c2a-76 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 1024px){.kadence-column24093_981c2a-76, .kt-inside-inner-col > .kadence-column24093_981c2a-76:not(.specificity){margin-top:60px;margin-right:0px;margin-bottom:0px;margin-left:0px;}}@media all and (max-width: 767px){.kadence-column24093_981c2a-76 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column24093_981c2a-76, .kt-inside-inner-col > .kadence-column24093_981c2a-76:not(.specificity){margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}}.kadence-column24093_981c2a-76 {  position: relative;}<\/style>\n<div class=\"wp-block-kadence-column kadence-column24093_981c2a-76 inner-column-2\"><div class=\"kt-inside-inner-col\">\n<video width=\"306\" height=\"606\" autoplay=\"\" loop=\"\" muted=\"\" playsinline=\"\" class=\"h-[466px] -translate-x-[288px] translate-y-16\"><source src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/12\/meilleure-application-beaute-1.mov\" type=\"video\/quicktime\"><source src=\"https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2024\/12\/meilleure-application-beaute.webm\" type=\"video\/webm\"><\/video>\n<\/div><\/div>\n\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Today's cosmetics are full of ingredients that promise wonders, but two of them stand out in particular: vitamin C (pure or in derivative form) and vitamin B3, better known as niacinamide. Anti-aging, anti-blemish, anti-dark spot... They seem to do it all. 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