{"product_id":"cosrx-refresh-aha-bha-vitamin-c-booster-serum-30ml-mirai-skin-cosrx-refresh-aha-bha-vitamin-c-booster-serum-30ml","title":"COSRX Refresh AHA\/BHA Vitamin C Booster Serum 30ml","description":"\u003ch2\u003eCOSRX Refresh AHA\/BHA Vitamin C Booster Serum: Three Actives for Texture and Tone\u003c\/h2\u003e\n\u003cp\u003eCOSRX's Refresh AHA\/BHA Vitamin C Booster Serum combines three of the most effective brightening and exfoliating actives into a single serum: ascorbic acid (vitamin C), glycolic acid (AHA), and salicylic acid (BHA). At $24.96 for 30ml, this is aggressively priced for a triple-active formulation. Most brands sell each active separately; COSRX's approach is consolidated routine simplification.\u003c\/p\u003e\n\u003cp\u003eThe trade-off with combined-active formulations is concentration limitations (you can't have high concentrations of all three actives in the same formula without severe irritation) and pH conflicts (vitamin C prefers pH 3.5 while BHA needs pH 4 for activity). COSRX has formulated this at a compromise pH around 3.5 to 4, which means moderate activity for each active but genuine functionality across the board. For users who want multi-pronged routine simplification, this delivers.\u003c\/p\u003e\n\u003ch3\u003eWhat It Does\u003c\/h3\u003e\n\u003cp\u003eAscorbic acid brightens and provides antioxidant protection. Glycolic acid (AHA) exfoliates the skin surface, fading pigmentation and smoothing texture. Salicylic acid (BHA) penetrates pores to address congestion and blackheads. The combined action addresses both surface pigmentation and pore concerns. Over 4 to 8 weeks of use (typically at every-other-day application), visible brightening, texture smoothing, and reduced pore appearance.\u003c\/p\u003e\n\u003ch3\u003eWho It's For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-concern skin:\u003c\/strong\u003e Primary target. Pigmentation plus pores plus texture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoutine simplification seekers:\u003c\/strong\u003e Three products in one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive-experienced users:\u003c\/strong\u003e Not a starter serum; pre-acclimated skin recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue shoppers:\u003c\/strong\u003e Three actives at single-active pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombination skin with uneven tone:\u003c\/strong\u003e Addresses both oily and pigmented areas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVolume: 30ml\u003c\/li\u003e\n\u003cli\u003ePrice: $24.96\u003c\/li\u003e\n\u003cli\u003eHero actives: ascorbic acid (vitamin C), glycolic acid (AHA), salicylic acid (BHA)\u003c\/li\u003e\n\u003cli\u003eTexture: lightweight serum\u003c\/li\u003e\n\u003cli\u003epH: approximately 3.5 to 4\u003c\/li\u003e\n\u003cli\u003eFragrance: very mild\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cp\u003eStart every other evening, moving to nightly if tolerated. Apply 2 to 3 drops to clean dry skin after toner. Wait 15 minutes before next step, which should be a calming or hydrating layer (not another active). Always follow with sunscreen the next morning. Do not layer with retinol, aggressive BHA, or other acids on the same evening.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch4\u003eWill it sting?\u003c\/h4\u003e\n\u003cp\u003eInitial applications: mild to moderate tingling for 30 to 60 seconds. This is normal for active serums at this pH. If stinging is severe or lasts longer than 5 minutes, the product is too strong for your skin; step down to a single-active serum first.\u003c\/p\u003e\n\u003ch4\u003eCan I use it every day?\u003c\/h4\u003e\n\u003cp\u003eFor beginners, no. Start every other evening. After 3 to 4 weeks if tolerating well, move to nightly. Don't rush the ramp-up; barrier damage from aggressive active use is difficult to reverse.\u003c\/p\u003e\n\u003ch4\u003eHow does it compare to The Ordinary AHA\/BHA Peel?\u003c\/h4\u003e\n\u003cp\u003eThe Ordinary's peel is a rinse-off weekly treatment at much higher acid concentrations. COSRX is a leave-on daily-use serum at lower concentrations. For intensive weekly treatment: The Ordinary. For daily gradual improvement: COSRX.\u003c\/p\u003e\n\u003ch4\u003eShould I use this AM or PM?\u003c\/h4\u003e\n\u003cp\u003ePM only. Vitamin C plus AHA plus BHA increases sun sensitivity. Always apply SPF 50+ the next morning. Some users split: vitamin C AM and AHA\/BHA PM, using different products. This combined serum is PM-only.\u003c\/p\u003e\n\u003ch4\u003eSafe during pregnancy?\u003c\/h4\u003e\n\u003cp\u003eNo. Salicylic acid at this concentration is generally avoided during pregnancy. Skip during pregnancy and return post-partum.\u003c\/p\u003e\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cp\u003eFollow with COSRX Hydrium Moisture Cream as the calming, sealing moisturizer. Browse the full COSRX collection or related: Korean exfoliants, vitamin C products.\u003c\/p\u003e\n","brand":"mirai-skin","offers":[{"title":"Default Title","offer_id":51741072326944,"sku":"51816165572980","price":12.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1004\/8333\/4432\/files\/227bc5b230ca63de0cea6fe73886084f.webp?v=1779694390","url":"https:\/\/usmirai-skin.com\/products\/cosrx-refresh-aha-bha-vitamin-c-booster-serum-30ml-mirai-skin-cosrx-refresh-aha-bha-vitamin-c-booster-serum-30ml","provider":"usmirai-skin.com","version":"1.0","type":"link"}