{"product_id":"cosrx-advanced-the-vitamin-c-23-serum-20-g","title":"COSRX Advanced The Vitamin C 23 Serum 20 g","description":"\u003cp\u003eA high-strength vitamin C serum from COSRX with 23% pure vitamin C (ascorbic acid), plus vitamin E (tocotrienols), glutathione, niacinamide and hyaluronic acid. It's made for brightening, smoothing and refining pores, and COSRX recommends it for people who already use vitamin C and want a stronger formula.\u003c\/p\u003e\n\u003ch3\u003eQuick Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat it is:\u003c\/strong\u003e a 23% pure vitamin C serum from the Korean brand COSRX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 20 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e after cleansing and toning, 2–3 drops\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey ingredients:\u003c\/strong\u003e ascorbic acid (23%), 3-O-ethyl ascorbic acid, tocotrienols and tocopherol (vitamin E), glutathione, niacinamide, panthenol, squalane, sodium hyaluronate, adenosine, caffeine, licorice root extract\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e keep refrigerated at 3–10°C and use within 2 months of opening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTesting:\u003c\/strong\u003e non-comedogenic and skin irritation tests completed, according to COSRX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhere to buy it in Egypt:\u003c\/strong\u003e at SkinPop, skinpopeg.com, with delivery across Egypt\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat it's for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrightening dull, tired or uneven skin\u003c\/li\u003e\n\u003cli\u003eFading the look of dark spots, pigmentation and blemish marks\u003c\/li\u003e\n\u003cli\u003eHelping with early signs of aging, like rough texture and loss of firmness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn a 4-week study on 20 adults by Dermacosmetic Skin Science Lab in Korea (3 May to 30 June 2025), COSRX reports radiance up 34.81%, pigmentation area down 17.43% and pore volume down 38.15%. Results vary.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGood for:\u003c\/strong\u003e people experienced with vitamin C, and skin dealing with dullness, dark spots or uneven texture.\u003c\/p\u003e\n\u003ch3\u003eHow to use\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eAfter cleansing and toning, apply 2–3 drops to the whole face.\u003c\/li\u003e\n\u003cli\u003ePat gently to help it absorb.\u003c\/li\u003e\n\u003cli\u003eFollow with moisturizer, and SPF during the day.\u003c\/li\u003e\n\u003cli\u003eAfter opening, replace the cap with the dropper and store it in the fridge.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCautions\u003c\/h3\u003e\n\u003cp\u003eFor external use only. Avoid the eyes. Patch test first, especially if you're new to strong vitamin C. Stop using it if irritation occurs. COSRX recommends not using it alongside copper peptide products or other high-strength actives such as retinol; use them at different times of day. Keep refrigerated at 3–10°C. Shelf life is 24 months from manufacture, or 2 months after opening. Keep out of reach of children.\u003c\/p\u003e\n\u003ch3\u003eQuestions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does it need to be refrigerated?\u003c\/strong\u003e\u003cbr\u003ePure vitamin C breaks down with heat and air. COSRX asks you to keep it at 3–10°C and use it within 2 months of opening, which matters even more in Egypt's heat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs 23% too strong for beginners?\u003c\/strong\u003e\u003cbr\u003eCOSRX describes it as ideal for experienced vitamin C users. If you're new to vitamin C, start every other day and patch test first.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it with niacinamide or retinol?\u003c\/strong\u003e\u003cbr\u003eIt already contains niacinamide. Keep retinol and copper peptides for a different time of day, as COSRX recommends.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does delivery take in Egypt?\u003c\/strong\u003e\u003cbr\u003eDelivery takes 2–5 business days, depending on your area.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePairs well with:\u003c\/strong\u003e the \u003ca href=\"\/products\/cosrx-hyaluronic-acid-intensive-cream-100-g\"\u003eCOSRX Hyaluronic Acid Intensive Cream\u003c\/a\u003e after it, and the \u003ca href=\"\/products\/beauty-of-joseon-relief-sun-rice-probiotics-spf50-pa\"\u003eBeauty of Joseon Relief Sun\u003c\/a\u003e in the morning. More options in our \u003ca href=\"\/collections\/serums\"\u003eSerums collection\u003c\/a\u003e and \u003ca href=\"\/collections\/dark-spots-dullness\"\u003eDark Spots \u0026amp; Dullness\u003c\/a\u003e.\u003c\/p\u003e","brand":"COSRX","offers":[{"title":"Default Title","offer_id":67751560413284,"sku":"CSX-SRM-20G-01","price":1100.0,"currency_code":"EGP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0795\/2295\/5364\/files\/CSX-SRM-20G-01_1.jpg?v=1793220182","url":"https:\/\/www.skinpopeg.com\/products\/cosrx-advanced-the-vitamin-c-23-serum-20-g","provider":"Skinpop","version":"1.0","type":"link"}