{"product_id":"cosrx-the-vitamin-c-23-serum-20ml","title":"COSRX The Vitamin C 23 Serum 20ml","description":"\u003ch2\u003eWhat is COSRX The Vitamin C 23 Serum?\u003c\/h2\u003e\n\u003cp\u003eCOSRX The Vitamin C 23 Serum is a high-strength antioxidant serum built around 23% pure vitamin C in its most researched form, L-ascorbic acid. It comes in a small 20ml bottle on purpose: pure vitamin C is powerful but delicate, so a compact size means you finish it while it is still fresh. COSRX pairs the vitamin C with vitamin E (tocopherol and tocotrienols), panthenol, sodium hyaluronate and allantoin to keep the formula as comfortable as a strong active can be.\u003c\/p\u003e\n\u003cp\u003eIn practical terms, this is a brightening step for skin that looks dull, tired or uneven, and a daily antioxidant shield that works alongside your sunscreen. It is one of the strongest vitamin C serums you can buy in a K-beauty routine, which is exactly why so many people in Pakistan search for it after trying gentler vitamin C products and wanting more visible glow.\u003c\/p\u003e\n\u003ch3\u003eWhat does 23% vitamin C actually mean?\u003c\/h3\u003e\n\u003cp\u003eThe number refers to the concentration of ascorbic acid in the formula. Most everyday vitamin C serums sit between 5% and 15%. At 23%, this serum is at the very top of the range, so it delivers a lot of antioxidant power per drop. That strength is great for experienced skin, but it is also why the serum can tingle for a minute after you apply it, and why beginners should build up slowly.\u003c\/p\u003e\n\u003ch3\u003eIs it a serum, an essence or a treatment?\u003c\/h3\u003e\n\u003cp\u003eIt is a treatment serum. It is slightly thicker than water, a little silky from the dimethicone and squalane, and it belongs after toner and before moisturiser. Think of it as the active step in your morning routine rather than a hydrating layer.\u003c\/p\u003e\n\n\u003ch2\u003eCOSRX The Vitamin C 23 Serum benefits: what it does for your skin\u003c\/h2\u003e\n\u003cp\u003ePure vitamin C works on several fronts at once, which is why dermatologists so often recommend it as a morning step. Here is what you can realistically expect from consistent use.\u003c\/p\u003e\n\u003ch3\u003eBrighter, more radiant skin\u003c\/h3\u003e\n\u003cp\u003eVitamin C helps skin look fresher and more luminous. Within the first couple of weeks most people notice that their face looks less flat and grey, especially in the cheeks and forehead, which tend to look tired after long days in traffic, heat and dust.\u003c\/p\u003e\n\u003ch3\u003eA more even-looking tone\u003c\/h3\u003e\n\u003cp\u003eWith regular use, ascorbic acid helps soften the look of dark spots, sun marks and the brown marks left behind by old breakouts. It does not change your natural skin colour; it simply helps uneven patches blend in better with the rest of your face.\u003c\/p\u003e\n\u003ch3\u003eAntioxidant support against sun and pollution\u003c\/h3\u003e\n\u003cp\u003eUnder Pakistan's strong UV and city pollution, skin is constantly exposed to free-radical stress. Vitamin C helps neutralise that stress, and it works best layered under a broad-spectrum sunscreen, where the two support each other.\u003c\/p\u003e\n\u003ch3\u003eFirmer, smoother-looking skin over time\u003c\/h3\u003e\n\u003cp\u003eVitamin C supports the skin's own collagen processes. You will not see this overnight, but over several months skin can look smoother and more resilient, and fine lines around the eyes may look softer.\u003c\/p\u003e\n\n\u003ch2\u003eCOSRX The Vitamin C 23 Serum key ingredients\u003c\/h2\u003e\n\u003cp\u003eThe formula is short on fillers and long on supporting ingredients that keep a very strong vitamin C as tolerable as possible.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eIngredient\u003c\/th\u003e\n\u003cth\u003eWhat it does\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAscorbic acid (23%)\u003c\/td\u003e\n\u003ctd\u003eThe pure, active form of vitamin C: brightens, evens tone and provides antioxidant defence\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthyl ascorbyl ether\u003c\/td\u003e\n\u003ctd\u003eA stable vitamin C derivative that adds longer-lasting brightening support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTocopherol and tocotrienols\u003c\/td\u003e\n\u003ctd\u003eVitamin E family antioxidants that work hand in hand with vitamin C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePanthenol and allantoin\u003c\/td\u003e\n\u003ctd\u003eSoothing helpers that make the tingle easier to live with\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSodium hyaluronate and squalane\u003c\/td\u003e\n\u003ctd\u003eLight hydration so the serum does not feel tight or drying\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlutathione and niacinamide (small amounts)\u003c\/td\u003e\n\u003ctd\u003eSupporting antioxidants for a more even-looking complexion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhy vitamin C and vitamin E belong together\u003c\/h3\u003e\n\u003cp\u003eVitamin E helps stabilise vitamin C and extends its antioxidant work, so the pair is more effective together than either one alone. That is why the most respected vitamin C formulas almost always include it.\u003c\/p\u003e\n\u003ch3\u003eDoes it contain fragrance?\u003c\/h3\u003e\n\u003cp\u003eThere is no added perfume listed. The serum may have a faint, slightly metallic scent, which is normal for pure ascorbic acid.\u003c\/p\u003e\n\n\u003ch2\u003eIs COSRX The Vitamin C 23 Serum good for your skin type?\u003c\/h2\u003e\n\u003cp\u003eStrength is the deciding factor here. This serum rewards skin that is already comfortable with actives and asks a little patience from everyone else.\u003c\/p\u003e\n\u003ch3\u003eIs COSRX The Vitamin C 23 Serum good for oily skin?\u003c\/h3\u003e\n\u003cp\u003eYes, oily and combination skin usually loves it. The texture absorbs quickly and does not leave a greasy film, so it sits well under a light gel moisturiser and sunscreen even in July humidity. Many oily-skin users find that pure vitamin C gives them the glow they want without the shine they do not.\u003c\/p\u003e\n\u003ch3\u003eIs COSRX The Vitamin C 23 Serum good for acne-prone skin?\u003c\/h3\u003e\n\u003cp\u003eIt can be, with care. Vitamin C does not treat breakouts directly, but it helps the marks they leave behind look less obvious. If your skin is actively inflamed, irritated or peeling from acne treatments, introduce it slowly and keep the rest of your routine gentle, for example with the \u003ca href=\"\/products\/cosrx-low-ph-good-morning-cleanser-150ml\"\u003eCOSRX Low pH Good Morning Cleanser\u003c\/a\u003e and a calming hydrator.\u003c\/p\u003e\n\u003ch3\u003eDry and normal skin\u003c\/h3\u003e\n\u003cp\u003eNormal skin generally does well from the start. Dry skin may feel the strength more, so follow it with a richer moisturiser and do not stack it with other strong actives in the same routine.\u003c\/p\u003e\n\u003ch4\u003eWho should patch-test first or skip it\u003c\/h4\u003e\n\u003cp\u003eVery sensitive or reactive skin, rosacea-prone skin, and anyone whose barrier is currently damaged should patch-test on the jawline for a few days first, or begin with a lower-strength vitamin C. If you are pregnant or breastfeeding, check any new active with your doctor.\u003c\/p\u003e\n\n\u003ch2\u003eHow to use COSRX The Vitamin C 23 Serum (morning and night)\u003c\/h2\u003e\n\u003cp\u003eThe way you introduce a 23% vitamin C matters more than the product itself. Go slowly and your skin will thank you.\u003c\/p\u003e\n\u003ch3\u003eIn your morning routine\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eCleanse and pat your face completely dry; vitamin C on damp skin can sting more.\u003c\/li\u003e\n\u003cli\u003eShake the bottle gently, then apply two or three drops to your fingertips.\u003c\/li\u003e\n\u003cli\u003ePress it over your face, working from the centre outwards and avoiding the eye area.\u003c\/li\u003e\n\u003cli\u003eWait a minute, then apply moisturiser.\u003c\/li\u003e\n\u003cli\u003eFinish with a broad-spectrum sunscreen every single morning.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCan I use vitamin C serum twice a day?\u003c\/h3\u003e\n\u003cp\u003eWith a serum this strong, once a day is enough for almost everyone. Morning use makes the most sense because vitamin C supports your sunscreen against daytime stress. If you prefer evenings, that works too, but there is no extra benefit in using it both morning and night, and twice-daily use raises the risk of irritation.\u003c\/p\u003e\n\u003ch3\u003eHow much and how often\u003c\/h3\u003e\n\u003cp\u003eTwo or three drops cover the face. Start two or three mornings a week for the first fortnight, then move to daily if your skin stays comfortable. A short tingle that fades within a minute is normal; lasting stinging, burning or redness is a sign to cut back.\u003c\/p\u003e\n\u003ch3\u003eWhat to pair it with\u003c\/h3\u003e\n\u003cp\u003eHydrating layers work beautifully on top. The \u003ca href=\"\/products\/cosrx-advanced-snail-96-mucin-power-essence\"\u003eCOSRX Advanced Snail 96 Mucin Power Essence\u003c\/a\u003e can go on before it to cushion the skin, and the \u003ca href=\"\/products\/cosrx-advanced-snail-92-all-in-one-cream\"\u003eAdvanced Snail 92 All in One Cream\u003c\/a\u003e makes a comfortable moisturiser afterwards.\u003c\/p\u003e\n\u003ch3\u003eWhat not to mix it with\u003c\/h3\u003e\n\u003cp\u003eKeep retinoids and exfoliating acids for the evening, on alternate nights, rather than layering them over vitamin C. If you also use niacinamide, such as the \u003ca href=\"\/products\/anua-peach-70-niacinamide-serum-30ml\"\u003eANUA Peach 70% Niacinamide Serum\u003c\/a\u003e, many people find it most comfortable to use it in the evening while vitamin C stays in the morning.\u003c\/p\u003e\n\n\u003ch2\u003eCOSRX The Vitamin C 23 Serum results: how long until you see a difference?\u003c\/h2\u003e\n\u003cp\u003eExpect a little extra glow within the first one to two weeks, simply because skin looks fresher. A more even-looking tone and softer-looking marks usually take six to twelve weeks of consistent daily use, alongside sunscreen. Collagen-related smoothness is a longer project of several months. If you skip sunscreen, results stall, because new sun exposure keeps darkening the same areas.\u003c\/p\u003e\n\n\u003ch2\u003eDoes COSRX The Vitamin C 23 Serum have side effects?\u003c\/h2\u003e\n\u003cp\u003eThe most common reaction is a mild, short-lived tingle. Some people notice a little redness or dryness during the first weeks, especially if they apply it to damp skin or use it daily from day one. Stop and give your skin a break if you see persistent burning, swelling or rash. Very occasionally pure vitamin C can leave a faint orange tint on the skin or pillow if it has oxidised, which is another reason to finish the bottle within a few months of opening.\u003c\/p\u003e\n\u003ch3\u003eCan vitamin C make my skin more sensitive to the sun?\u003c\/h3\u003e\n\u003cp\u003eVitamin C itself is not known to make skin burn more easily, but any brightening routine is wasted without sun protection, so daily sunscreen is non-negotiable.\u003c\/p\u003e\n\n\u003ch2\u003eCOSRX The Vitamin C 23 Serum vs The Vitamin C 13 Serum\u003c\/h2\u003e\n\u003cp\u003eCOSRX makes two pure vitamin C serums, and the right one depends on how experienced your skin is.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eVitamin C 23\u003c\/th\u003e\n\u003cth\u003eVitamin C 13\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVitamin C strength\u003c\/td\u003e\n\u003ctd\u003e23% ascorbic acid\u003c\/td\u003e\n\u003ctd\u003e13% ascorbic acid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eSkin already used to actives, stubborn dullness and marks\u003c\/td\u003e\n\u003ctd\u003eFirst-time vitamin C users and sensitive skin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTingle\u003c\/td\u003e\n\u003ctd\u003eMore noticeable at first\u003c\/td\u003e\n\u003ctd\u003eGentler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed of visible glow\u003c\/td\u003e\n\u003ctd\u003eFaster for tolerant skin\u003c\/td\u003e\n\u003ctd\u003eSteadier, slower build\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eChoose Vitamin C 23 if you have used vitamin C before without irritation and want stronger results. Choose a lower strength if this is your first vitamin C serum or your skin reacts easily.\u003c\/p\u003e\n\u003ch3\u003eWhat percentage of vitamin C should be in a serum?\u003c\/h3\u003e\n\u003cp\u003eFor most people, 10% to 20% gives a good balance of results and comfort. Strengths above 20%, like this serum, suit experienced skin. More is not automatically better: the best percentage is the highest one your skin tolerates every day.\u003c\/p\u003e\n\n\u003ch2\u003eCOSRX The Vitamin C 23 Serum price in Pakistan\u003c\/h2\u003e\n\u003cp\u003eIt comes in one size, a 20ml bottle, and the current price is shown live at the top of this page. A 20ml bottle used at two or three drops each morning typically lasts around two months, which is ideal because pure vitamin C is best used fresh. Buying the original matters even more with vitamin C than with most products, because a poorly stored or fake serum can arrive already oxidised and do nothing for your skin.\u003c\/p\u003e\n\n\u003ch2\u003eOriginal vs fake COSRX The Vitamin C 23 Serum: how to check\u003c\/h2\u003e\n\u003cp\u003eA genuine bottle has clean, sharp printing, a batch number and expiry date that match on the box and the bottle, and a seal that is intact when it arrives. The serum itself should be clear to very pale; a dark yellow or brown colour on a new bottle suggests oxidation or a counterfeit. Be wary of unusually cheap offers, missing outer boxes and sellers who cannot tell you where their stock comes from.\u003c\/p\u003e\n\u003cp\u003eYESBEAUTY is an authentic seller of COSRX in Pakistan. Every bottle is sourced directly from COSRX's official distribution channels in Seoul, Korea, imported through the brand's own route and stored away from heat until it ships. As part of the Korean Skincare group, we have been delivering authentic K-beauty for 10 years, and if a product is ever found inauthentic you are covered by our 7-day return guarantee. You can read how we protect every order in the \u003ca href=\"\/pages\/authenticity-promise\"\u003eYESBEAUTY Authenticity Promise\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eBest vitamin C serum for oily skin in Pakistan: where Vitamin C 23 fits\u003c\/h2\u003e\n\u003cp\u003eFor oily, tolerant skin that wants maximum glow, Vitamin C 23 is one of the strongest options available. If your priority is calming breakouts and oil rather than brightening, a niacinamide serum such as \u003ca href=\"\/products\/the-ordinary-niacinamide-10-plus-zinc-1-serum\"\u003eThe Ordinary Niacinamide 10% + Zinc 1%\u003c\/a\u003e may suit you better, and it pairs well with vitamin C on alternate routines. For evening renewal, a retinoid like the \u003ca href=\"\/products\/celimax-the-vita-a-retinol-shot-tightening-serum-30ml\"\u003ecelimax The Vita-A Retinol Shot Tightening Serum\u003c\/a\u003e completes a brightening routine. You can compare every option in our \u003ca href=\"\/collections\/ing-vitamin-c\"\u003evitamin C collection\u003c\/a\u003e, explore the full \u003ca href=\"\/collections\/serums\"\u003eserums edit\u003c\/a\u003e or browse the whole \u003ca href=\"\/collections\/cosrx\"\u003eCOSRX range\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eStoring your vitamin C serum in Pakistan's heat\u003c\/h2\u003e\n\u003cp\u003eHeat, light and air are the enemies of pure vitamin C. Keep the cap tightly closed, store the bottle in a cool cupboard rather than a sunny bathroom shelf or a hot car, and finish it within about two to three months of opening. If the serum turns noticeably darker, it has lost much of its strength and it is time for a fresh bottle.\u003c\/p\u003e","brand":"COSRX","offers":[{"title":"20ml","offer_id":67806488002951,"sku":"CSX-SR-005-20ML","price":6780.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1112\/5620\/7751\/files\/cosrx-the-vitamin-c-23-serum-20ml-1.jpg?v=1793180262","url":"https:\/\/yesbeauty.pk\/products\/cosrx-the-vitamin-c-23-serum-20ml","provider":"YESBEAUTY","version":"1.0","type":"link"}