Sulwhasoo
Sulwhasoo Essential Balancing Water (자정수) (Korean)This brand publishes no English name for this product. The name above is as printed in Korean.
Key 3-O-Ethyl Ascorbic Acid (#20 on the ingredient list), Niacinamide, Gluconolactone
43 of the 2320 products we've checked feature this as a key ingredient. Products that disclose a concentration or list it near the top of the ingredient list come first.
Back to 3-O-Ethyl Ascorbic Acid
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Sulwhasoo
Key 3-O-Ethyl Ascorbic Acid (#20 on the ingredient list), Niacinamide, Gluconolactone
Veganifect
Key 3-O-Ethyl Ascorbic Acid (#21 on the ingredient list), Niacinamide, Hippophae Rhamnoides Fruit Oil
Key 3-O-Ethyl Ascorbic Acid (#23 on the ingredient list), Niacinamide, Glutathione

Round Lab
It's registered in Korea as a functional cosmetic for brightening and wrinkle improvement.
Key 3-O-Ethyl Ascorbic Acid (#23 on the ingredient list), Hippophae Rhamnoides Water, Niacinamide
Claims, checked
Whitening · Wrinkle Improvement Dual Functional Cosmeticsbacked by evidenceTRIPLE VITA ACTIVER™ 73%backed by evidenceNiacinamide 5% care for surface blemishes that have already surfacedbacked by evidenceCream alone use 4.04% serum+cream together use 10.51% 2.6x UP!backed by evidenceCream alone use 5.63% serum+cream together use 11.62% 2.07x UP!backed by evidenceSkin irritation test completed primary skin irritation evaluation by skin patch test on sensitive skin subjectsbacked by evidenceUnscentedbacked by evidenceRefreshing capsule texture filled with moistureplausible, not testedA capsule-type serum that absorbs quickly without the residue unique to vitamin serums, providing a refreshing and moist finish.plausible, not testedSlightly viscous and wateryplausible, not testedSatisfaction 100%partly backedWith Vitamin C derivative, gentle even for sensitive skinpartly backedThe Vitamin C derivative with low irritation and secured stability helps daily blemish care so it can be used regardless of day or night, not to mention sensitive skin.partly backedTranexamic Acid & Bisabolol care for invisible inner blemishespartly backedSurface melanin improvement (surface blemishes)partly backedMelanin improvement beneath the surface (inner blemishes)partly backedBlotchy skin tone, radiant and even!partly backedImprove skin transparency across the entire face (7POINT)!partly backedRough skin texture, smooth it out!partly backedMoisturizing soothing Panthenol that even catches drynesspartly backed*The more the skin is filled with moisture, the brighter the blue light becomes.partly backedWhen serum & cream are used together, blemish improvement effect 2x UPpartly backedCompleted domestic and overseas skin irritation tests, mild without irritationpartly backedGerman derma test completed 24-hour patch test completedpartly backedMade using soy ink on FSC-certified folding cartons to protect forests.partly backedSensitive + All Skin Typespartly backedNiacinamide and Tranexamic Acid work together to visibly reduce dark spots, while Panthenol helps maintain moisture and comfort.partly backedA Round Lab proprietary ingredient that helps effective blemish care without worrying about irritation through a custom-designed combination of Vitamin Tree Water, Vitamin Tree Fruit Extract, and Vitamin C derivative ingredients.overstatedThe fruit of the vitamin tree grown in regions rich in sunlight is full of various vitamins, and among them is rich in Vitamin C, making it effective for blemish care.overstatedBlemishes that have already formed, and even blemishes that will form in the future! 3-STEP blemish careoverstatedFrom dark blemishes to melanin, cleanlyoverstatedDull skin, evenly and transparentlyoverstatedContains Panthenol so that sensitive skin can also care for blemishes without worrying about irritation, caring for the skin comfortably and moistly.overstatedGlutathione & Idebenone prevent blemishes that have not surfacedno supporting source foundContains ‘Vita Capsule’ for reliable efficacy delivery.no supporting source foundWith Vita Capsules containing Glutathione and Idebenone, active ingredients are delivered densely to the skin, caring for blemishes more effectively.no supporting source foundImprovement in area and number of melasma, blemishes, and frecklesno supporting source foundBlemish Cleaning Swish-!nothing specific to checkVitamin Tree Fruit Extract densely packed with efficacynothing specific to check
APRILSKIN
Key 3-O-Ethyl Ascorbic Acid (#25 on the ingredient list), Aloe Barbadensis Leaf Water, Niacinamide
Claims, checked
Sebum trouble* soothing & tone-up effectpartly backed
numbuzin
Key 3-O-Ethyl Ascorbic Acid (#25 on the ingredient list), Niacinamide, Panthenol
Claims, checked
Niacinamide (50,000 ppm)backed by evidenceNo. 5 Whitening/Blemishplausible, not tested[Blemish Whitening]nothing specific to checkKey 3-O-Ethyl Ascorbic Acid (#25 on the ingredient list), Jojoba Seed Oil, Argania Spinosa (Argan) Kernel Oil
It's registered in Korea as a functional cosmetic for brightening and wrinkle improvement.
Key 3-O-Ethyl Ascorbic Acid (#31 on the ingredient list), Niacinamide, Glutathione
Claims, checked
Wrinkle improvement, whitening dual-functional cosmeticbacked by evidenceCalming. Contains LHA, a low-irritation exfoliating ingredient, which helps to refine skin texture with moisture, and 4 moisture soothing boosters* combine to help soothe sensitized skin.backed by evidence*Limited to raw material characteristics.backed by evidenceSurface pigmentation improvement: 3.63% after 3 days, 8.30% after 2 weeks, 9.74% after 4 weeks.partly backedDeep pigmentation improvement: 9.43% after 3 days, 16.17% after 2 weeks, 17.81% after 4 weeks.partly backedImmediate (temporary) skin tone & skin transparency & skin texture improvement test completed. Skin tone 2.03% improvement, skin transparency 2.82% improvement, skin texture 8.67% improvement.partly backedGlutathiosome × PlusSome® Vita C* × Niacinamide. Contains niacinamide, which helps to alleviate pigmentation on the skin surface, and PlusSome® Vita C and Glutathiosome ingredients help care for invisible deep skin blemishes.partly backedLess stress. Even sensitive skin, without worry, experience clear skin every day.partly backedBrightening care. In just 3 days, one pad solves blemish concerns at once! From skin tone improvement to dark spots and blemish care, experience skin that is even clearer and more transparent.overstatedDeep pigmentation improved by 161.81% with simultaneous use of pad & serum.overstatedGlutathiosome. Glutathiosome = Glutathione + Exosome. Using an exosomization method that encapsulates difficult-to-handle 98% pure glutathione in a plant-derived dual lipid membrane, it helps to effectively absorb active ingredients.no supporting source foundTriple rayon sheet. A vegan-certified triple-layer sheet, filled with more than approximately 20 times its weight in essence, is a soft 7cm large-size triple-layer sheet that adheres tightly to the skin, delivering abundant moisture.no supporting source foundGlutathiosome dark spot pad Vita touchnothing specific to checkKey 3-O-Ethyl Ascorbic Acid (#37 on the ingredient list), Citrus Tangerina (Tangerine) Extract, Niacinamide
It's registered in Korea as a functional cosmetic for brightening and wrinkle improvement.
Key 3-O-Ethyl Ascorbic Acid (#37 on the ingredient list), Citrus Limon (Lemon) Fruit Water 65.5%, Citrus Limon (Lemon) Peel Water 3.5%
Claims, checked
95ml / 3.21 fl.oz.backed by evidenceWhitening, wrinkle improvement dual functional cosmeticbacked by evidenceAdapt Inc.backed by evidence(LEMON) VITA BUBBLE SERUM 95ml 3.21fl.oz.backed by evidenceThe more you layer the refreshing formula, the clearer and more transparent your skin becomesplausible, not tested69% whole lemon water instead of water, clear vitality energypartly backedThe more you apply daily, the more blemishes·complexion improvepartly backedClear vitality energy filled with 69% whole lemon waterpartly backedOrganic lemons grown in Jeju's pristine region are squeezed whole, from flesh to peel, to fill dull skin with vitality and clear radiance.partly backedUltra-fine bubble particles, fine particles, absorb more quickly and deeplyoverstatedWith a vitamin formula that boosts absorption, blemishes·tone improve from withinoverstatedThe single box of this product uses FSC-certified eco-friendly paper materials to protect resources in a sustainable manner.no supporting source foundVEGANno supporting source foundUltra-fine bubble formula, 3-second absorption serumno supporting source foundUltra-fine bubble formula that absorbs in 3 secondsno supporting source foundHigh-efficacy ingredients gently seep in to rapidly recharge vitalityno supporting source foundAbout 4.3 times higher vitamin C content than imported ingredientsno supporting source foundVisible skin changes with 2 weeks of useno supporting source foundPopping lemon bubbles,nothing specific to checkFrom skin tone to radiance all at oncenothing specific to checkMoisture glow coating & clear skin lemon vita serumnothing specific to checkRADIANCE & GLOWnothing specific to checkNo matter how much you cover, dull complexion, are you worried?nothing specific to checkLike coating moisture glow on the skin, complete makeup-absorbing skin!nothing specific to check
Aestura
Key 3-O-Ethyl Ascorbic Acid (#37 on the ingredient list), Hydroxypinacolone Retinoate, Niacinamide
Claims, checked
Retinoid·Peptidebacked by evidence: Blended with Hydroxypinacolone Retinoate (50 ppm), Acetyl Heptapeptide-4, Acetyl Hexapeptide-8, and Acetyl Octapeptide-3.backed by evidence: Contains Niacinamide, Adenosine, 3-O-Ethyl Ascorbic Acid, Glucosyl Hesperidin, and Hydrolyzed Extensin.backed by evidence: Contains Cholesterol, Hydrogenated Lecithin, and Hydroxypropyl Bispalmitamide MEA.backed by evidenceRetinoid Derma Eye Serum that densely fills from the barrier to inner elasticity for sensitive eye areas that are thinner and more delicate.overstatedStrengthens elasticity of sensitive eye area.no supporting source found
Arencia
Key 3-O-Ethyl Ascorbic Acid (#37 on the ingredient list), Niacinamide, Arbutin
Claims, checked
brightening, wrinkle improvementplausible, not tested