{"id":4417,"date":"2026-02-09T18:04:03","date_gmt":"2026-02-09T18:04:03","guid":{"rendered":"https:\/\/www.rodanandfields.com\/en-us\/blog\/?p=4417"},"modified":"2026-02-20T18:40:37","modified_gmt":"2026-02-20T18:40:37","slug":"the-science-behind-pure-c-vitamin-c-serum","status":"publish","type":"post","link":"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/","title":{"rendered":"The Science Behind Pure C Vitamin C Serum"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#WHY_PURE_C_SERUM\" >WHY PURE C SERUM?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Oil-_or_Silicone-based_formula\" >Oil- or Silicone-based formula<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Water-based_formula\" >Water-based formula<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Oil-in-water_emulsion\" >Oil-in-water emulsion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Glycol-in-oil_emulsion\" >Glycol-in-oil emulsion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Glycol_Serum\" >Glycol Serum<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Oil_Serum\" >Oil Serum<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#L-Ascorbic_acid_Acetyl_Zingerone\" >L-Ascorbic acid + Acetyl Zingerone<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#PURE_C_SERUM_HAS_STABLE_VITAMIN_C_TO_SUPPORT_NATUAL_COLLAGEN_PRODUCTION\" >PURE C SERUM HAS STABLE VITAMIN C TO SUPPORT NATUAL COLLAGEN PRODUCTION<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#PURE_C_SERUM_DELIVERS_VITMAIN_C_FOR_TWICE_THE_ANTIOXIDANT_PROTECTION\" >PURE C SERUM DELIVERS VITMAIN C FOR TWICE THE ANTIOXIDANT PROTECTION<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Ratio_of_the_Antioxidant_Capability_of_Skin_Treated_vs_Untreated\" >Ratio of the Antioxidant Capability of Skin Treated vs Untreated<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/#Surface_oxidized_proteins_in_the_Dermis\" >Surface % oxidized proteins in the Dermis<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"WHY_PURE_C_SERUM\"><\/span>WHY PURE C SERUM?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are many types of Vitamin C products on the market ranging in consistency, texture and Vitamin C stability. Unfortunately, Vitamin C formulated in water is not stable and decomposition results in discoloration, loss of Vitamin C, and reduction in its antioxidant benefits.<sup>1<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.rodanandfields.com\/en-us\/shop\/pure-c-serum\/p\/ENVCS30\" target=\"_blank\" rel=\"noreferrer noopener\">Pure C Serum<\/a><\/strong> is a unique, self-activating, 10% Ascorbic Acid serum, that addresses the visible signs of age, keeps Vitamin C in a dormant and potent state until ready for use. Formulated without water or oil which means it won\u2019t degrade over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some products avoid this instability using oil soluble\/water soluble derivatives of Vitamin C. These are more stable and allow for formulation with water, but they must be converted in the skin to active Vitamin C, until that happens, the antioxidant benefits may be reduced.<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Pure-C-Formulations-550x180.jpg\" alt=\"Vitamin C formulations including Oil, Silicone, water, emulsion, glycol Zingerone-based formulas.\" class=\"wp-image-4421\" width=\"634\" height=\"207\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Pure-C-Formulations-550x180.jpg 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Pure-C-Formulations-1100x361.jpg 1100w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Pure-C-Formulations-768x252.jpg 768w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Pure-C-Formulations.jpg 1207w\" sizes=\"auto, (max-width: 634px) 100vw, 634px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Oil-_or_Silicone-based_formula\"><\/span>Oil- or Silicone-based formula<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Formula with a dispersion of Vitamin C crystals\/particles<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Water-based_formula\"><\/span>Water-based formula<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Solution of Vitamin C molecules <em>dissolved<\/em> in water. Think how table salt dissolves in water.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Oil-in-water_emulsion\"><\/span>Oil-in-water emulsion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Formula where the Vitamin C or derivative is <em>dissolved<\/em> in water, but oils are used to improve aesthetics.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Glycol-in-oil_emulsion\"><\/span>Glycol-in-oil emulsion<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vitamin C is <em>dissolved<\/em> in Glycol and glycol is emulsified into an oil or silicone-based emulsion<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Glycol_Serum\"><\/span>Glycol Serum<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Vitamin C is <em>dissolved<\/em> in a Glycol no oil phase used<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Oil_Serum\"><\/span>Oil Serum<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ascorbic acid derivative is <em>dissolved<\/em> in oil- or silicone-based formula<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><em>\u201cIt uses pure L-ascorbic acid \u2014 not derivatives\u2026 and it&#8217;s formulated without water or oil. That&#8217;s huge because vitamin C is notoriously unstable and degrades when exposed to water.\u201d<\/em><\/p>\n<cite><strong><a href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/doctors-notes\/rodan-fields-transforming-skincare-innovation-with-expert-dermatologist-insights\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dr. Faranak Kamangar<\/a><\/strong><\/cite><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"L-Ascorbic_acid_Acetyl_Zingerone\"><\/span>L-Ascorbic acid + Acetyl Zingerone<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/L-Ascorbic-acid-Acetyl-Zingerone-1100x307.jpg\" alt=\"Molecular structure of L-Ascorbic acid &amp; Acetyl Zingerone\" class=\"wp-image-4425\" width=\"577\" height=\"161\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/L-Ascorbic-acid-Acetyl-Zingerone-1100x307.jpg 1100w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/L-Ascorbic-acid-Acetyl-Zingerone-550x154.jpg 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/L-Ascorbic-acid-Acetyl-Zingerone-768x214.jpg 768w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/L-Ascorbic-acid-Acetyl-Zingerone.jpg 1347w\" sizes=\"auto, (max-width: 577px) 100vw, 577px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pure C serum contains stable pure L-ascorbic acid and acetyl zingerone in a glycol serum, providing two lines of defense against aging: antioxidant booster and collagen support.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><sup>1<\/sup>Jansson PJ, Jung HR, Lindqvist C, Nordstr\u00f6m T. Oxidative decomposition of vitamin C in drinking water. <em>Free Radic Res.<\/em> 2004;38(8):855-860.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PURE_C_SERUM_HAS_STABLE_VITAMIN_C_TO_SUPPORT_NATUAL_COLLAGEN_PRODUCTION\"><\/span><strong>PURE C SERUM HAS STABLE VITAMIN C TO SUPPORT NATUAL COLLAGEN PRODUCTION<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike some other products in the market that can degrade and turn yellow after a few uses, <strong>Pure C Serum\u2019s<\/strong> potency remains as you use it versus degradation from day 1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Does your Vitamin C Serum look like this?<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/STABLE-VITAMIN-C-TO-SUPPORT-NATUAL-COLLAGEN-PRODUCTION.jpg\" alt=\"Visual comparison of Rodan + Fields Pure C Serum (clear) vs vitamin C serum in water (yellow)\" class=\"wp-image-4427\" width=\"388\" height=\"215\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/STABLE-VITAMIN-C-TO-SUPPORT-NATUAL-COLLAGEN-PRODUCTION.jpg 772w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/STABLE-VITAMIN-C-TO-SUPPORT-NATUAL-COLLAGEN-PRODUCTION-550x304.jpg 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/STABLE-VITAMIN-C-TO-SUPPORT-NATUAL-COLLAGEN-PRODUCTION-768x425.jpg 768w\" sizes=\"auto, (max-width: 388px) 100vw, 388px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><em>\u201cYou know how vitamin C serums often turn yellow or brown? That&#8217;s oxidation\u2026 By removing water from the equation entirely, this formula maintains potency.\u201d<\/em><\/p>\n<cite><strong><a rel=\"noreferrer noopener\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/doctors-notes\/rodan-fields-transforming-skincare-innovation-with-expert-dermatologist-insights\/\" target=\"_blank\">Dr. Faranak Kamangar<\/a><\/strong><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">It all starts with the science. Our dermatologists and chemists developed this pure 10% Vitamin C serum in a unique water-free + oil-free formula, for optimal stability, potency and efficacy. <strong>Pure C Serum<\/strong> delivers a consistent dose of 10% ascorbic acid from the first drop to the last, unlike some other formulations that can degrade over time.*<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Fold-Loss-of-Vitamin-C.jpg\" alt=\"Chart showing fold loss of vitamin C of Pure C (negligible) vs 10% Ascorbic Acid in water, pH 3.2 (ratio of 20)\" class=\"wp-image-4429\" width=\"565\" height=\"242\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Fold-Loss-of-Vitamin-C.jpg 967w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Fold-Loss-of-Vitamin-C-550x236.jpg 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Fold-Loss-of-Vitamin-C-768x330.jpg 768w\" sizes=\"auto, (max-width: 565px) 100vw, 565px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">* based on a 30-day stability study.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This pure 10% Vitamin C serum is contained within a unique waterless + oil-free formula!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pure C Serum&#8217;s<\/strong> unique formula maintains stability and potency versus the market leading products.*<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image.png\" alt=\"Chart showing fold loss ratio of Vitamin C. Pure C Serum (ratio 1), and 3 competitors over (ratio 4)\" class=\"wp-image-4430\" width=\"566\" height=\"231\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image.png 1036w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-550x225.png 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-768x314.png 768w\" sizes=\"auto, (max-width: 566px) 100vw, 566px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>* based on a 30-day stability study.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pure C Serum<\/strong> contains Vitamin C which has been shown to increase collagen production. Confirming what is known in the scientific literature. <sup>2,3<\/sup><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><em>\u201cThe data shows it can increase collagen production by 35% in just 48 hours\u2026 demonstrating true collagen building.\u201d<\/em><\/p>\n<cite><strong><a rel=\"noreferrer noopener\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/doctors-notes\/rodan-fields-transforming-skincare-innovation-with-expert-dermatologist-insights\/\" target=\"_blank\">Dr. Faranak Kamangar<\/a><\/strong><\/cite><\/blockquote>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Newly-Synthesized-Collagen-1-in-Skin-Cells.jpg\" alt=\"Chart showing newly synthesized collagen-1 in skin cells. L-ascorbic acid (vitamin c) showing 25uM (35% new collagen-1 vs control). Compared with media only (0%).\" class=\"wp-image-4432\" width=\"564\" height=\"310\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Newly-Synthesized-Collagen-1-in-Skin-Cells.jpg 993w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Newly-Synthesized-Collagen-1-in-Skin-Cells-550x303.jpg 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/Newly-Synthesized-Collagen-1-in-Skin-Cells-768x423.jpg 768w\" sizes=\"auto, (max-width: 564px) 100vw, 564px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">*Based on in vitro studies on skin cells.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><sup>2<\/sup>Geesin JC, Gordon JS, Berg RA. Regulation of collagen synthesis in human dermal fibroblasts by the sodium and magnesium salts of ascorbyl-2-phosphate. <em>Skin Pharmacol.<\/em> 1993;6(1):65-71.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><sup>3<\/sup>Murad S, Tajima S, Johnson GR, Sivarajah S, Pinnell SR. Collagen synthesis in cultured human skin fibroblasts: effect of ascorbic acid and its analogs. <em>J Invest Dermatol.<\/em> 1983;81(2):158-162.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PURE_C_SERUM_DELIVERS_VITMAIN_C_FOR_TWICE_THE_ANTIOXIDANT_PROTECTION\"><\/span><strong>PURE C SERUM DELIVERS VITMAIN C FOR TWICE THE ANTIOXIDANT PROTECTION<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ratio of total Vitamin C detected. Ascorbic Acid in skin 8 hours after application:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-5.png\" alt=\"Chart showing ascorbic Acid in skin 8 hours after application. Pure C Serum showing ratio over 50, vs oil-based formulation (<10), ascorbic acid derivative (negligible)\" class=\"wp-image-4453\" width=\"603\" height=\"331\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-5.png 1002w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-5-550x302.png 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-5-768x422.png 768w\" sizes=\"auto, (max-width: 603px) 100vw, 603px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pure C Serum<\/strong> in this waterless, oilless formula, delivers more REAL Vitamin C to the skin where it&#8217;s needed compared to the most popular derivative.<sup>4<\/sup><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><em>\u201cNo derivatives means the skin doesn&#8217;t have to do the conversion work. You&#8217;re getting the real deal \u2014 pure ascorbic acid that can get to work immediately.\u201d<\/em><\/p>\n<cite><strong><a rel=\"noreferrer noopener\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/doctors-notes\/rodan-fields-transforming-skincare-innovation-with-expert-dermatologist-insights\/\" target=\"_blank\">Dr. Faranak Kamangar<\/a><\/strong><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Does your Vitamin C Serum really deliver Vitamin C?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike some water and oil-based serums that can degrade over time, <strong>Pure C Serum<\/strong> remains at full potency, enhancing the skin\u2019s antioxidant defense by 2X to powerfully combat damaging free radicals.<sup>4<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ratio_of_the_Antioxidant_Capability_of_Skin_Treated_vs_Untreated\"><\/span>Ratio of the Antioxidant Capability of Skin Treated vs Untreated<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-4.png\" alt=\"Chart showing Ratio of the Antioxidant Capability of Skin Treated vs Untreated. Pure C showing ratio of 2 vs placebo (1).\" class=\"wp-image-4451\" width=\"536\" height=\"302\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-4.png 976w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-4-550x310.png 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-4-768x433.png 768w\" sizes=\"auto, (max-width: 536px) 100vw, 536px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Surface_oxidized_proteins_in_the_Dermis\"><\/span>Surface % oxidized proteins in the Dermis<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-1.png\" alt=\"Chart showing surface % oxidized proteins in the dermis. Maximum 100% change vs stimulated control. Pure C Serum Treated showing 56%.\" class=\"wp-image-4448\" width=\"534\" height=\"324\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-1.png 955w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-1-550x334.png 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-1-768x466.png 768w\" sizes=\"auto, (max-width: 534px) 100vw, 534px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><em>%Change vs Stimulated Control<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pure C Serum<\/strong> was shown to protect against environmental aggressors by 44% to defend against visible signs of premature skin aging.<sup>5<\/sup><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><em>\u201cThe clinical results are really compelling \u2014 94%\u2026 less noticeable wrinkles\u2026 three-quarters saw plumper, smoother skin\u2026 It is possible to change skin structure\u2026 if the science and chemistry is right.\u201d<\/em><\/p>\n<cite><strong><a rel=\"noreferrer noopener\" href=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/doctors-notes\/rodan-fields-transforming-skincare-innovation-with-expert-dermatologist-insights\/\" target=\"_blank\">Dr. Faranak Kamangar<\/a><\/strong><\/cite><\/blockquote>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-3.png\" alt=\"Before and after image of study participant at baseline vs 8 weeks. \" class=\"wp-image-4450\" width=\"606\" height=\"309\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-3.png 958w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-3-550x281.png 550w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/image-3-768x393.png 768w\" sizes=\"auto, (max-width: 606px) 100vw, 606px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">+ 94% achieved less noticeable wrinkles**<br>+ 82% had fewer fine lines*<br>+ 75% noticed plumper-looking skin*<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>*Based on an 8-week U.S. clinical and consumer study.<br>**Based on an 8-week U.S. clinical study using image analysis of wrinkles.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><sup>4<\/sup>Based on an ex-vivo study<br><sup>5<\/sup>Based on an ex-vivo study on UV irradiated skin, maximum oxidized proteins from the untreated UV-irradiated control.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/rodan-fields-pure-c-serum.jpg\" alt=\"Pure C Vitamin C Serum\" class=\"wp-image-4442\" width=\"375\" height=\"387\" srcset=\"https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/rodan-fields-pure-c-serum.jpg 806w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/rodan-fields-pure-c-serum-533x550.jpg 533w, https:\/\/www.rodanandfields.com\/en-us\/blog\/wp-content\/uploads\/2026\/02\/rodan-fields-pure-c-serum-768x793.jpg 768w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a rel=\"noopener\" href=\"https:\/\/www.rodanandfields.com\/en-us\/shop\/pure-c-serum\/p\/ENVCS30\" target=\"_blank\">Pure C Serum<\/a> is a collagen-supporting longevity serum, powered by the purest form of Vitamin C, that helps preserve a youthful appearance for visibly firmer, smoother, brighter skin.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WHY PURE C SERUM? There are many types of Vitamin C products on the market ranging in consistency, texture and Vitamin C stability. Unfortunately, Vitamin C formulated in water is not stable and decomposition results in discoloration, loss of Vitamin C, and reduction in its antioxidant benefits.1 Pure C Serum is a unique, self-activating, 10%&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4452,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[7],"tags":[117,29],"class_list":["post-4417","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-of-skincare","tag-pure-c-serum","tag-vitamin-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Science Behind Pure C Vitamin C Serum - The Skincare Source<\/title>\n<meta name=\"description\" content=\"Stable 10% vitamin C serum designed to stay potent. Supports antioxidant defense and collagen for brighter, smoother-looking skin over time.\" \/>\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.rodanandfields.com\/en-us\/blog\/science-of-skincare\/the-science-behind-pure-c-vitamin-c-serum\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Science Behind Pure C Vitamin C Serum - The Skincare Source\" \/>\n<meta property=\"og:description\" content=\"Stable 10% vitamin C serum designed to stay potent. 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