{"product_id":"cosrx-advanced-pure-vitamin-c-serum-23-0-7-oz-brightening-with-vitamin-e-glutathione","title":"COSRX Advanced Pure Vitamin C Serum 23% (0.7 oz) — Brightening with Vitamin E \u0026 Glutathione","description":"\u003cp\u003e\u003cstrong\u003eCOSRX Advanced Pure Vitamin C 23% Serum is a lightweight topical booster that combines high-concentration ascorbic acid with vitamin E and glutathione to help brighten dull skin and target uneven tone.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis serum delivers a potent 23% pure vitamin C (ascorbic acid) formula in a non-sticky texture designed for daily layering in your skincare routine. The upgraded version removes the original scent while preserving the active concentration and adds a three-way antioxidant blend—tocotrienol (a form of vitamin E) and glutathione—to support overall radiance and antioxidant defense. The 0.7 oz dropper bottle is formulated for careful use: shake before application, store chilled after opening, and pair with SPF during daytime wear.\u003c\/p\u003e\n\n\u003ch3\u003eHow should I use this high-strength vitamin C serum safely?\u003c\/h3\u003e\n\u003cp\u003eStart slowly and perform a patch test to confirm skin tolerance, then introduce the serum into your AM or PM routine one to two times daily. Apply just a few drops to clean, dry skin and follow with moisturizer; during the day, always finish with SPF 30 or higher. Store the bottle in the refrigerator after opening to slow oxidation and keep the formula stable.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eShake 1–2 times before use to ensure even texture.\u003c\/li\u003e\n  \u003cli\u003eUse 2–3 drops on face; can be applied under the eye area cautiously.\u003c\/li\u003e\n  \u003cli\u003eApply sunscreen for daytime use to protect treated skin.\u003c\/li\u003e\n  \u003cli\u003eRefrigerate after opening to maintain potency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat results can I reasonably expect and when?\u003c\/h3\u003e\n\u003cp\u003eVisible improvements such as a brighter complexion and a reduction in the appearance of dullness or uneven tone may appear with consistent use over weeks. Because this is a high-concentration ascorbic acid serum, early benefits often include improved skin radiance and a more even-looking surface; longer-term benefits depend on routine consistency and sun protection. Individual response varies by skin type and prior product use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInitial glow can appear within 2–4 weeks for many users.\u003c\/li\u003e\n  \u003cli\u003eReduction in pigment irregularities typically needs several weeks to months.\u003c\/li\u003e\n  \u003cli\u003eResults are enhanced when combined with daily SPF and supportive skincare.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this serum suitable for sensitive or reactive skin?\u003c\/h3\u003e\n\u003cp\u003eBecause the formula contains 23% pure ascorbic acid, it is potent and may cause irritation on very sensitive or reactive skin types. A patch test is recommended (wait 24 hours) before applying to the full face. If you experience stinging, redness, or discomfort, discontinue use and consult a healthcare professional; consider lower-concentration vitamin C alternatives if sensitivity persists.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePatch test on the inner arm or behind the ear for 24 hours first.\u003c\/li\u003e\n  \u003cli\u003eReduce frequency (every other day) while skin builds tolerance.\u003c\/li\u003e\n  \u003cli\u003eAvoid contact with open wounds or broken skin; stop if irritation occurs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the antioxidant blend in this serum help my routine?\u003c\/h3\u003e\n\u003cp\u003eThe combination of pure vitamin C, a tocotrienol form of vitamin E, and glutathione creates complementary antioxidant activity that supports protection against free-radical stress and helps improve the skin’s overall appearance. While vitamin C primarily targets brightness and antioxidant support, tocotrienol aids in stabilizing the formula and contributing to barrier resilience, and glutathione is included to help even out skin tone. Together they form a targeted support system for daytime and nightly care when used appropriately.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAscorbic acid: delivers concentrated brightening and antioxidant action.\u003c\/li\u003e\n  \u003cli\u003eTocotrienol (vitamin E): supports skin resilience and formula stability.\u003c\/li\u003e\n  \u003cli\u003eGlutathione: assists in improving the look of uneven pigmentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this product is for: COSRX Advanced Pure Vitamin C 23% Serum is aimed at people comfortable with high-strength active skincare who want to boost radiance, address early signs of uneven tone, and layer a concentrated vitamin C underneath moisturizing and protective steps. It suits those familiar with active ingredients, willing to perform patch tests, and committed to daily sun protection; those with highly reactive or eczema-prone skin may prefer lower-strength vitamin C options first.\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: Can I use this vitamin C serum every day?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—after a successful patch test you can use it once or twice daily; reduce frequency if irritation appears and always use SPF during the day.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Should I refrigerate the serum after opening?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, storing it in the fridge after opening helps slow oxidation and keeps the vitamin C more stable.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"COSRX","offers":[{"title":"Default Title","offer_id":49632556417162,"sku":"B0FWQGLTQV","price":90.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0779\/4825\/6394\/files\/cosrx-serum-front-bottle_ccd8af95-fdd1-4e62-b6f6-92e873e449a3.jpg?v=1782961381","url":"https:\/\/auviraskincare.com\/products\/cosrx-advanced-pure-vitamin-c-serum-23-0-7-oz-brightening-with-vitamin-e-glutathione","provider":"Auvira Beauty","version":"1.0","type":"link"}