{"product_id":"cosrx-pure-vitamin-c-13-serum-0-67-oz-brightening-vitamin-c-with-hyaluronic-acid-vitamin-e-for-uneven-tone","title":"COSRX Pure Vitamin C 13% Serum — 0.67 oz Brightening Vitamin C with Hyaluronic Acid \u0026 Vitamin E for Uneven Tone","description":"\u003cp\u003e\u003cstrong\u003eCOSRX Pure Vitamin C 13% Serum is a concentrated daily brightening serum that blends pure ascorbic acid with vitamin E, hyaluronic acid, and glutathione to help even tone and hydrate skin.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis lightweight Korean serum delivers an effective level of pure vitamin C (13% ascorbic acid) alongside supportive antioxidants and moisture-binding ingredients to address dullness, uneven pigmentation, and fine lines. The formula is designed for daily use; it absorbs quickly without leaving a sticky finish and layers well under moisturizers and sunscreen. Keep in mind vitamin C serums are oxidation-prone, so store it cool after opening and perform a patch test before full-face application.\u003c\/p\u003e\n\n\u003ch3\u003eHow should I add this serum to my morning and evening routine?\u003c\/h3\u003e\n\u003cp\u003eApply 2–3 drops to clean, dry skin once or twice daily depending on tolerance. In the morning, always follow with a broad-spectrum SPF 30+; at night pair it with a gentle moisturizer. Shake the bottle before use to ensure uniform texture and actives.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse on cleansed face and neck, avoiding direct contact with eyes.\u003c\/li\u003e\n  \u003cli\u003ePress 2–3 drops into skin and let absorb before layering other products.\u003c\/li\u003e\n  \u003cli\u003eUse sunscreen during daytime for protection and results.\u003c\/li\u003e\n  \u003cli\u003eRefrigerate after opening to slow oxidation and maintain potency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this serum suit sensitive or reactive skin?\u003c\/h3\u003e\n\u003cp\u003eThe 13% ascorbic acid concentration is potent and can irritate sensitive skin, so start gradually. Perform a 24-hour patch test on the inner forearm or behind the ear; discontinue if you experience redness or persistent stinging. You can also reduce frequency to every other day until tolerance builds.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePatch test before full-face use and wait 24 hours for a reaction check.\u003c\/li\u003e\n  \u003cli\u003eBegin with small amounts and limit application to evenings if needed.\u003c\/li\u003e\n  \u003cli\u003eLayer with soothing, fragrance-free moisturizers to minimize irritation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat visible improvements can I expect and when?\u003c\/h3\u003e\n\u003cp\u003eConsistent use can help brighten dullness and make skin tone appear more uniform over several weeks. Hyaluronic acid supplies immediate moisture and plumps fine lines, while vitamin E and glutathione support antioxidant protection. Individual results vary with skin type and routine consistency.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eImmediate: increased hydration and smoother skin texture.\u003c\/li\u003e\n  \u003cli\u003e4–8 weeks: gradual reduction in dullness and more even tone.\u003c\/li\u003e\n  \u003cli\u003eLong-term: enhanced radiance when paired with sun protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I store and preserve this vitamin C serum?\u003c\/h3\u003e\n\u003cp\u003eAscorbic acid oxidizes when exposed to heat, light, and air, so keep the bottle tightly closed and stored in a cool, dark place. COSRX recommends refrigerating after opening to extend freshness. If the serum darkens or develops a sour smell, discard it and replace the product.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eShake before each use to mix actives evenly.\u003c\/li\u003e\n  \u003cli\u003eRefrigerate once opened to slow oxidation.\u003c\/li\u003e\n  \u003cli\u003eReplace if color changes noticeably or scent turns off.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This serum is aimed at anyone seeking a stronger topical vitamin C treatment to target dullness, uneven skin tone, and early signs of aging while also delivering hydration. It suits those comfortable introducing a potent active into their routine and willing to follow storage and sun-protection guidance. If you have very sensitive or rosacea-prone skin, consult a dermatologist and proceed with patch testing before regular use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I use COSRX Pure Vitamin C 13% Serum?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Apply 2–3 drops once or twice daily depending on tolerance; always use SPF in the morning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this serum with retinol or acids?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Introduce combinations slowly; avoid layering strong actives at the same time and consult a dermatologist if unsure.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"COSRX","offers":[{"title":"Default Title","offer_id":58345388081539,"sku":"B0FWQKKT1K","price":30.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/2696\/0515\/files\/cosrx-pure-vitamin-c-13-percent-serum-front-bottle.jpg?v=1782619324","url":"https:\/\/origin-beauty.com\/products\/cosrx-pure-vitamin-c-13-serum-0-67-oz-brightening-vitamin-c-with-hyaluronic-acid-vitamin-e-for-uneven-tone","provider":"Origin Beauty","version":"1.0","type":"link"}