{"id":68307,"date":"2025-12-05T15:11:12","date_gmt":"2025-12-05T14:11:12","guid":{"rendered":"https:\/\/www.beautydecoded.com\/produits\/non%20class\u00e9\/the-vitamin-c-13-serum\/"},"modified":"2025-12-05T15:11:37","modified_gmt":"2025-12-05T14:11:37","slug":"vitamin-c-13-serum","status":"publish","type":"product","link":"https:\/\/www.beautydecoded.com\/en\/products\/cosrx\/vitamin-c-13-serum\/","title":{"rendered":"The Vitamin C 13 Serum"},"content":{"rendered":"

AQUA<\/a>, ASCORBIC ACID<\/a> (Pure vitamin C), BUTYLENE GLYCOL<\/a>, DIPROPYLENE GLYCOL<\/a>, TROMETHAMINE<\/a>, 3-O-ETHYL ASCORBIC ACID<\/a> (Vitamin C derivative), PANTHENOL<\/a> (Pro-vitamin B5), ACETYL GLUCOSAMINE<\/a> (Antioxidant), CAFFEINE<\/a> (Active ingredient derived from the Arabian coffee tree), SODIUM HYALURONATE<\/a> (Hyaluronic acid), SODIUM SULFITE<\/a>, DISODIUM EDTA<\/a>, GLUTATHIONE<\/a> (Antioxidant), ADENOSINE<\/a> (Active), GARDENIA FLORIDA FRUIT EXTRACT<\/a>, ALLANTOIN<\/a> (Active ingredient derived from comfrey), DEXTRIN<\/a>, SQUALANE<\/a> (Squalane, Hydrogenated Oil), TOCOTRIENOLS<\/a>, TOCOPHEROL<\/a> (Vitamin E), ELAEIS GUINEENSIS OIL<\/a> (Oil palm vegetable oil (comedogenic)), ARGININE<\/a> (Amino acid), NIACINAMIDE<\/a> (Vitamin B3), PENTYLENE GLYCOL<\/a>, Licorice Root Extract<\/a> (Licorice)<\/p>\n

My Doctor's Diagnosis: Analysis and Target<\/h2>\n

The serum Cosrx The Vitamin C 13 Serum<\/strong> is primarily intended for individuals seeking to address dull complexion, pigmentation spots, early signs of aging (wrinkles, fine lines), and lack of radiance. The Cosrx brand offers a formulation focused on correcting complexion and preventing skin aging, while respecting sensitive skin thanks to a synergy of soothing and antioxidant active ingredients. In my opinion, the formula is particularly suitable for skin prone to hyperpigmentation, oxidative stress, and loss of firmness.<\/p>\n

Formula Analysis: Key Assets<\/h2>\n

Three major active ingredients stand out in this serum:<\/p>\n

    \n
  • Pure vitamin C (ascorbic acid) and 3-O-ethyl ascorbic acid<\/strong> These two forms of vitamin C work synergistically to stimulate collagen synthesis, reduce pigmentation spots, and protect the skin against free radicals. Their powerful antioxidant action helps to even out the complexion and prevent premature aging.<\/li>\n
  • Niacinamide<\/strong> This vitamin B3 strengthens the skin barrier, regulates sebum production, and improves skin radiance. It enhances the action of vitamin C while limiting irritation.<\/li>\n
  • Hyaluronic acid (sodium hyaluronate)<\/strong> It intensely moisturizes the skin, plumps fine lines, and optimizes serum tolerance, even on sensitive skin.<\/li>\n<\/ul>\n

    The presence of complementary antioxidants (glutathione, tocopherol) and soothing active ingredients (panthenol, allantoin) enhances the overall quality of the formula.<\/p>\n

    Tips and Application Ritual<\/h2>\n

    I recommend applying this serum in the morning, on clean, dry skin, before moisturizer and sunscreen. It can also be used in the evening, but as vitamin C is photosensitive, sunscreen is essential during the day. This serum is compatible with hyaluronic acid, niacinamide, and peptides. I avoid combining it with powerful exfoliating active ingredients (AHAs\/BHAs) or retinol at the same time to limit the risk of irritation.<\/p>\n

    My Final Verdict & Safety Opinion<\/h2>\n

    Visit Cosrx The Vitamin C 13 Serum<\/strong> stands out for its balanced, effective, and well-tolerated formula, ideal for reviving the complexion's radiance and preventing the signs of aging. Its light texture makes it easy to absorb. One slight drawback: the presence of palm oil, which can be comedogenic on very oily skin. In conclusion, it is an excellent choice for those looking for a powerful and versatile antioxidant serum.<\/p>\n

    ","protected":false},"excerpt":{"rendered":"

    The Verdict & Review beautydecoded:
    Dry skin: Very good
    Oily skin: Avoid
    Anti-aging effectiveness: Very good \u2b50
    Effectiveness on blemishes: Very poor \u274c
    Effectiveness Hyperpigmentation: Good \u2705
    Effectiveness on redness: Limited \u25fc\ufe0f
    Sensitive skin: Not suitable \u26a0\ufe0f<\/p>","protected":false},"featured_media":68308,"comment_status":"open","ping_status":"open","template":"","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_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":""},"product_brand":[],"product_cat":[227],"product_tag":[],"class_list":{"0":"post-68307","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-cosrx","7":"pa_actif-ascorbicacidderivatives","8":"pa_actif-purevitaminc","9":"pa_type-de-produit-serum","11":"first","12":"instock","13":"product-type-external","14":"entry","15":"content-bg","16":"loop-entry"},"acf":[],"taxonomy_info":{"product_cat":[{"value":227,"label":"Cosrx"}],"pa_actif":[{"value":542,"label":"ascorbicacidderivatives"},{"value":570,"label":"purevitaminc"}],"pa_type-de-produit":[{"value":544,"label":"serum"}]},"featured_image_src_large":["https:\/\/www.beautydecoded.com\/wp-content\/uploads\/2025\/12\/vitamine-c-13.webp",800,800,false],"author_info":[],"comment_info":0,"_links":{"self":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product\/68307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/comments?post=68307"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/media\/68308"}],"wp:attachment":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/media?parent=68307"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_brand?post=68307"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_cat?post=68307"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_tag?post=68307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}