{"product_id":"cosrx-the-vitamin-c-23-serum","title":"COSRX - The Vitamin C 23 Serum (20ml)","description":"\u003cp\u003e\u003cstrong\u003eCOSRX The Vitamin C 23 Serum is a high-strength pure vitamin C serum\u003c\/strong\u003e — potent, well-evidenced, and more demanding about storage and handling than anything else in the range.\u003c\/p\u003e\n\n\u003ch2\u003eThe Vitamin C 23 Serum at a glance\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20ml\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh-strength vitamin C serum\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStrength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e23% pure vitamin C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest for\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDullness, uneven tone, antioxidant protection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMornings, before sunscreen\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCool, dark, tightly closed — it degrades with light and air\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eStrength, stinging, and the colour test\u003c\/h2\u003e\n\n\u003cp\u003ePure vitamin C is one of the best-supported actives available: it brightens, evens tone, and provides antioxidant protection that complements sunscreen against daily environmental damage. Used in the morning under SPF, it earns its place.\u003c\/p\u003e\n\n\u003cp\u003eTwo practical realities come with high concentrations. The first is tolerance — 23% is a lot, and stinging on application is common, particularly on sensitive or compromised skin. It is also worth knowing that absorption does not keep climbing indefinitely with concentration; research generally puts the useful ceiling around the 20% mark, above which you mostly gain irritation rather than effect. If this stings persistently, a lower-strength vitamin C is a reasonable and not inferior choice.\u003c\/p\u003e\n\n\u003cp\u003eThe second is stability. Pure vitamin C oxidises on contact with light, heat and air, and oxidised vitamin C does nothing useful. \u003cstrong\u003eJudge it by colour:\u003c\/strong\u003e fresh product is clear to pale yellow. As it ages it turns deep yellow, then orange, then brown. Once it is orange it has largely degraded — that is the point to replace it, not to push on to the last drop. Keep the cap tight, store it away from the bathroom window, and expect a few months of useful life after opening.\u003c\/p\u003e\n\n\u003cp\u003eA serum that has gone brown is not dangerous, simply spent.\u003c\/p\u003e\n\n\u003ch2\u003eHow to use it\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUse it in the morning\u003c\/strong\u003e on clean dry skin, before moisturiser.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStart every other day\u003c\/strong\u003e if you are new to high-strength vitamin C.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApply a few drops,\u003c\/strong\u003e avoiding the eye area, and let it absorb.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlways follow with sunscreen\u003c\/strong\u003e — vitamin C and SPF work together, and neither replaces the other.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClose the cap tightly\u003c\/strong\u003e and store somewhere cool and dark.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003eBrowse the full \u003ca href=\"\/collections\/cosrx\"\u003eCOSRX range at EmartGCC\u003c\/a\u003e, or the \u003ca href=\"\/collections\/korean-serums-kuwait\"\u003eKorean serums collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eMy serum turned orange. Can I still use it?\u003c\/h3\u003e\n\u003cp\u003eIt has oxidised and lost most of its potency. It is not harmful, but it is no longer doing much — replace it. Clear to pale yellow is fresh.\u003c\/p\u003e\n\n\u003ch3\u003eIs 23% better than a lower percentage?\u003c\/h3\u003e\n\u003cp\u003eNot necessarily. Absorption plateaus around 20%, so beyond that you tend to gain irritation rather than results. A lower-strength vitamin C is a perfectly good option, especially for sensitive skin.\u003c\/p\u003e\n\n\u003ch3\u003eIt stings when I apply it. Is that normal?\u003c\/h3\u003e\n\u003cp\u003eA brief tingle is common with high-strength vitamin C. Persistent stinging or burning means it is too strong for your skin — reduce frequency or switch to a gentler formulation.\u003c\/p\u003e\n\n\u003ch3\u003eMorning or night?\u003c\/h3\u003e\n\u003cp\u003eMorning, under sunscreen. Its antioxidant protection is most useful during daytime exposure.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use it with niacinamide?\u003c\/h3\u003e\n\u003cp\u003eYes. The old advice against combining them came from lab conditions that do not reflect modern formulations. If you prefer, use one morning and one evening.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use it with retinol?\u003c\/h3\u003e\n\u003cp\u003eYes, but not at the same time. Vitamin C in the morning and \u003ca href=\"\/products\/cosrx-the-retinol-0-1-cream-20ml\"\u003eretinol\u003c\/a\u003e at night is the standard, well-tolerated arrangement.\u003c\/p\u003e\n\n\u003ch3\u003eHow should I store it, and how long does it last?\u003c\/h3\u003e\n\u003cp\u003eCool, dark, tightly sealed, and out of a steamy bathroom. Expect a few months of useful life once opened — go by colour rather than the date.\u003c\/p\u003e\n\n\u003ch2\u003eBuying COSRX in Kuwait\u003c\/h2\u003e\n\n\u003cp\u003eEmartGCC supplies 100% original COSRX with free standard home delivery across Kuwait, usually next day. Areas beyond Fahaheel and Jahra carry a 3 KD delivery surcharge. Cash on delivery is available, and unopened items can be returned within 14 days.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"My serum turned orange. Can I still use it?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It has oxidised and lost most of its potency. It is not harmful, but it is no longer doing much — replace it. Clear to pale yellow is fresh.\"}},{\"@type\":\"Question\",\"name\":\"Is 23% better than a lower percentage?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not necessarily. Absorption plateaus around 20%, so beyond that you tend to gain irritation rather than results. A lower-strength vitamin C is a perfectly good option, especially for sensitive skin.\"}},{\"@type\":\"Question\",\"name\":\"It stings when I apply it. Is that normal?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A brief tingle is common with high-strength vitamin C. Persistent stinging or burning means it is too strong for your skin — reduce frequency or switch to a gentler formulation.\"}},{\"@type\":\"Question\",\"name\":\"Morning or night?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Morning, under sunscreen. Its antioxidant protection is most useful during daytime exposure.\"}},{\"@type\":\"Question\",\"name\":\"Can I use it with niacinamide?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The old advice against combining them came from lab conditions that do not reflect modern formulations. If you prefer, use one morning and one evening.\"}},{\"@type\":\"Question\",\"name\":\"Can I use it with retinol?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, but not at the same time. Vitamin C in the morning and retinol at night is the standard, well-tolerated arrangement.\"}},{\"@type\":\"Question\",\"name\":\"How should I store it, and how long does it last?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Cool, dark, tightly sealed, and out of a steamy bathroom. Expect a few months of useful life once opened — go by colour rather than the date.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/emartgcc.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"COSRX\",\"item\":\"https:\/\/emartgcc.com\/collections\/cosrx\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"COSRX - The Vitamin C 23 Serum (20ml)\"}]}\u003c\/script\u003e","brand":"COSRX","offers":[{"title":"Default Title","offer_id":67802137264195,"sku":null,"price":11.0,"currency_code":"KWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/2840\/6083\/files\/7a457c79b3352552af686c228afef258.jpg?v=1793133125","url":"https:\/\/abeerbeauty.com\/products\/cosrx-the-vitamin-c-23-serum","provider":"My Store","version":"1.0","type":"link"}