{"product_id":"cosrx-the-vitamin-c-23-serum","title":"COSRX The Vitamin C 23 Serum","description":"\u003cp\u003e\u003cstrong\u003eCOSRX The Vitamin C 23 Serum\u003c\/strong\u003e is a high-strength brightening serum with 23% pure vitamin C designed to improve the appearance of dullness, uneven skin tone, dark spots and early signs of aging.\u003c\/p\u003e\n\n\u003cp\u003eThe dual-layer formula combines \u003cstrong\u003e23% ascorbic acid\u003c\/strong\u003e with 3-O-ethyl ascorbic acid, panthenol, squalane, caffeine, sodium hyaluronate, niacinamide, glutathione, tocopherol and tocotrienols. It helps support a brighter, more even-looking complexion while providing additional hydration and antioxidant care. COSRX recommends this concentration especially for experienced vitamin C users. \u003c\/p\u003e\n\n\u003ch3\u003eBenefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHelps improve the appearance of dark spots and uneven skin tone.\u003c\/li\u003e\n\u003cli\u003eHelps brighten dull and tired-looking skin.\u003c\/li\u003e\n\u003cli\u003eProvides antioxidant care against environmental stress.\u003c\/li\u003e\n\u003cli\u003eHelps support smoother and firmer-looking skin.\u003c\/li\u003e\n\u003cli\u003eProvides additional moisturizing and soothing care.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho is it for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDull and uneven-looking skin.\u003c\/li\u003e\n\u003cli\u003eSkin with visible dark spots and post-blemish marks.\u003c\/li\u003e\n\u003cli\u003eSkin with early signs of aging.\u003c\/li\u003e\n\u003cli\u003eSkin in need of intensive brightening care.\u003c\/li\u003e\n\u003cli\u003eExperienced vitamin C users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMain ingredients\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eAscorbic Acid 23%\u003c\/strong\u003e – pure vitamin C that helps improve the appearance of discoloration, dullness and uneven tone.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e3-O-Ethyl Ascorbic Acid\u003c\/strong\u003e – a vitamin C derivative that provides additional brightening and antioxidant care.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePanthenol\u003c\/strong\u003e – helps moisturize and maintain skin comfort.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSqualane\u003c\/strong\u003e – helps soften the skin and support the moisture barrier.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCaffeine\u003c\/strong\u003e – provides antioxidant and skin-conditioning care.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNiacinamide\u003c\/strong\u003e – helps support a brighter and more even-looking complexion.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eGlutathione\u003c\/strong\u003e – provides antioxidant care and supports skin radiance.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTocopherol \u0026amp; Tocotrienols\u003c\/strong\u003e – vitamin E antioxidants that help condition and protect the skin.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSodium Hyaluronate\u003c\/strong\u003e – helps attract and retain moisture.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003cp\u003eAfter cleansing and toning, apply 2–3 drops of \u003cstrong\u003eCOSRX The Vitamin C 23 Serum\u003c\/strong\u003e evenly to the face and gently pat until absorbed. Follow with moisturizer. When used during the daytime, apply sunscreen afterward. Before use, close the dropper securely and gently shake the bottle from side to side. \u003c\/p\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow much vitamin C does COSRX The Vitamin C 23 Serum contain?\u003c\/strong\u003e\u003cbr\u003eThe formula contains 23% pure ascorbic acid. \u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan COSRX The Vitamin C 23 Serum be used every day?\u003c\/strong\u003e\u003cbr\u003eYes. It can be used in a regular skincare routine, although its high vitamin C concentration makes it better suited to users already accustomed to potent vitamin C products.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow should COSRX The Vitamin C 23 Serum be stored?\u003c\/strong\u003e\u003cbr\u003eStore the opened serum upright in the refrigerator at 3–10°C. COSRX recommends using it within 2 months after opening because pure vitamin C oxidizes easily. \u003c\/p\u003e\n\n\u003ch3\u003eWarnings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKeep refrigerated at 3–10°C after opening.\u003c\/li\u003e\n\u003cli\u003eStore upright and keep away from high temperatures and direct sunlight.\u003c\/li\u003e\n\u003cli\u003eDo not shake vigorously before opening; after attaching the dropper, shake lightly from side to side.\u003c\/li\u003e\n\u003cli\u003eUse within approximately 2 months after opening.\u003c\/li\u003e\n\u003cli\u003eWhen used during the day, follow with sunscreen.\u003c\/li\u003e\n\u003cli\u003eAvoid using in the same routine with high-concentration copper peptide products or retinol; use them at different times of day instead.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Cosrx","offers":[{"title":"20 ml.","offer_id":47726994751835,"sku":"YK1117","price":24.1,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0525\/1245\/6855\/files\/COSRX_The_Vitamin_C_23_Serum.webp?v=1728242760","url":"https:\/\/yokoskincare.fi\/en\/products\/cosrx-the-vitamin-c-23-serum","provider":"Yoko","version":"1.0","type":"link"}