{"id":68321,"date":"2025-12-05T15:11:40","date_gmt":"2025-12-05T14:11:40","guid":{"rendered":"https:\/\/www.beautydecoded.com\/produits\/non%20class\u00e9\/the-vitamin-c-23-serum\/"},"modified":"2026-04-02T19:57:24","modified_gmt":"2026-04-02T17:57:24","slug":"the-vitamin-c-23-serum","status":"publish","type":"product","link":"https:\/\/www.beautydecoded.com\/en\/products\/cosrx\/the-vitamin-c-23-serum\/","title":{"rendered":"The Vitamin C 23 Serum"},"content":{"rendered":"

AQUA<\/a>, ASCORBIC ACID<\/a> (Pure vitamin C), PROPANEDIOL<\/a>, DIMETHICONE<\/a> (Silicone), TROMETHAMINE<\/a>, PANTHENOL<\/a> (Pro-vitamin B5), 3-O-ETHYL ASCORBIC ACID<\/a> (Vitamin C derivative), SQUALANE<\/a> (Squalane, Hydrogenated Oil), CAFFEINE<\/a> (Active ingredient derived from the Arabian coffee tree), SODIUM CHLORIDE<\/a>, SODIUM HYALURONATE<\/a> (Hyaluronic acid), SODIUM SULFITE<\/a>, DISODIUM EDTA<\/a>, GLUTATHIONE<\/a> (Antioxidant), ADENOSINE<\/a> (Active), ACETYL GLUCOSAMINE<\/a> (Antioxidant), GARDENIA FLORIDA FRUIT EXTRACT<\/a>, ALLANTOIN<\/a> (Active ingredient derived from comfrey), DEXTRIN<\/a>, TOCOTRIENOLS<\/a>, TOCOPHEROL<\/a> (Vitamin E), ELAEIS GUINEENSIS OIL<\/a> (Oil palm vegetable oil (comedogenic)), BUTYLENE GLYCOL<\/a>, ARGININE<\/a> (Amino acid), NIACINAMIDE<\/a> (Vitamin B3), PENTYLENE GLYCOL<\/a>, ALCOHOL DENAT.<\/a> (Drying alcohol), HELIANTHUS ANNUUS SEED OIL<\/a> (Sunflower vegetable oil), Licorice Root Extract<\/a> (Licorice), METHYL TRIMETHICONE<\/a> (Silicone), CARTHAMUS TINCTORIUS SEED OIL<\/a> (Safflower vegetable oil), CAMELLIA JAPONICA SEED OIL<\/a> (Japanese camellia vegetable oil), DAUCUS CAROTA SATIVA ROOT EXTRACT<\/a> (Carrot), BETA-CAROTENE<\/a> (Active)<\/p>\n

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

The serum Cosrx The Vitamin C 23 Serum<\/strong> is primarily intended for individuals seeking to correct dull complexion, pigmentation spots, and early signs of aging, including wrinkles and loss of firmness. The Cosrx brand's formulation is distinguished by its high concentration of vitamin C, making it an intensive treatment for skin revitalization. My expert opinion: this product effectively targets cellular oxidation, loss of radiance, and pigmentation irregularities, while providing preventive action against skin aging.<\/p>\n

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

Three key active ingredients structure the effectiveness of this serum:<\/p>\n

    \n
  • Pure vitamin C (ascorbic acid 23%)<\/strong> : A powerful antioxidant, it neutralizes free radicals, stimulates collagen synthesis, and reduces dark spots. Its high concentration guarantees rapid action on radiance and firmness.<\/li>\n
  • Niacinamide<\/strong> This vitamin B3 regulates sebum production, improves the skin barrier, and evens out the complexion. It enhances the anti-dark spot effect of vitamin C.<\/li>\n
  • Hyaluronic acid (sodium hyaluronate)<\/strong> : It intensely moisturizes, counteracts the potentially drying effect of vitamin C, and promotes skin tolerance.<\/li>\n<\/ul>\n

    The presence of squalane and panthenol enhances hydration and soothing properties, making the formula suitable even for sensitive skin, subject to good individual tolerance.<\/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 is compatible with hyaluronic acid and niacinamide, but I do not recommend using it immediately after powerful exfoliants (AHA\/BHA) or retinol to avoid irritation. Gradual use is recommended for sensitive skin.<\/p>\n

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

    This Cosrx serum stands out for its high concentration of vitamin C, its effectiveness on radiance and dark spots, and its formula enriched with moisturizing and soothing active ingredients. Its main advantage is the synergy between antioxidants and repairing agents. One downside: the texture can be slightly oily and the characteristic smell of vitamin C may be surprising. In conclusion, it is an excellent choice for revitalizing and evening out the complexion, provided that the usual precautions are taken.<\/p>\n

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

    The Verdict & Review beautydecoded:
    Dry skin: Correct
    Oily skin: Very good
    Anti-aging effectiveness: Very good \u2b50
    Effectiveness on blemishes: Low
    Effectiveness Hyperpigmentation: Good \u2705
    Effectiveness on redness: Very good \u2b50
    Sensitive skin: Good \u2705<\/p>","protected":false},"featured_media":68322,"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-68321","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-cosrx","7":"pa_actif-ascorbicacidderivatives","8":"pa_actif-niacinamide","9":"pa_actif-purevitaminc","10":"pa_type-de-produit-serum","12":"first","13":"instock","14":"product-type-external","15":"entry","16":"content-bg","17":"loop-entry"},"acf":[],"taxonomy_info":{"product_cat":[{"value":227,"label":"Cosrx"}],"pa_actif":[{"value":542,"label":"ascorbicacidderivatives"},{"value":541,"label":"niacinamide"},{"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-23.webp",800,800,false],"author_info":[],"comment_info":4,"_links":{"self":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product\/68321","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=68321"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/media\/68322"}],"wp:attachment":[{"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/media?parent=68321"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_brand?post=68321"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_cat?post=68321"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.beautydecoded.com\/en\/wp-json\/wp\/v2\/product_tag?post=68321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}