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Shop COSRX The Alpha-Arbutin 2 Discoloration Care Serum
Serum
COSRX

The Alpha-Arbutin 2 Discoloration Care Serum

~$17.5· 50 ml
Dark spotsRadianceUneven texture

What it's good for

Key actives from our research database. Click any to read the full evidence dossier.

  • Alpha ArbutinModerate evidenceFull dossier ↗

    A safer, slower-acting alternative to prescription-strength dark-spot faders. Built for long-term use without irritation.

    Good for: Brightening

  • NiacinamideStrong evidenceFull dossier ↗

    A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.

    Good for: Brightening, Barrier repair, Anti-inflammatory

  • Tranexamic AcidStrong evidenceFull dossier ↗

    Fades stubborn dark patches like melasma and deep marks left behind by acne or hormonal shifts. The one to reach for when other brighteners haven't worked.

    Good for: Brightening

  • GlutathioneModerate evidenceFull dossier ↗

    A "master antioxidant" your body already makes. In skincare it gently lightens overall tone and helps fade pigmentation when used consistently over months.

    Good for: Brightening, Antioxidant

Evidence behind the ingredients

Real citations from our research database, one per tracked active in this product. Click any ingredient name to read its full evidence dossier.

Alpha ArbutinModerate evidence5 citations

A safer, slower-acting alternative to prescription-strength dark-spot faders. Built for long-term use without irritation.

Ma ZY, Lu Y, Melanin synthesis and regulation in vivo and commonly used melanin inhibitors from natural products and traditional Chinese medicine, Zhongguo Zhong Yao Za Zhi (China Journal of Chinese Materia Medica) 2020;45(24):5898-5916 — Beijing University of Chinese Medicine review classifies arbutin among tyrosinase-active-site-targeting melanin inhibitors

2020Mechanism onlyPMID:33496130View source ↗

Morag M et al., A double-blind, placebo-controlled randomized trial of Serratulae quinquefoliae folium, a new source of β-arbutin, in selected skin hyperpigmentations, Journal of Cosmetic Dermatology 2015 — 76% of melasma patients showed clinical lightening over 8 weeks

2015Positive (efficacy)PMID:26119285View source ↗

Kim H, Choi HR, Kim DS, Park KC, Topical hypopigmenting agents for pigmentary disorders and their mechanisms of action, Annals of Dermatology 2012;24(1):1-6 — review classifies arbutin among hypopigmenting agents via tyrosinase regulation as a hydroquinone alternative

2012Mechanism onlyPMID:22363147View source ↗
NiacinamideStrong evidence10 citations

A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.

Moro F et al., Skin Cancer Prevention and Antiaging: Role of Nicotinamide, International Journal of Molecular Sciences 2026

2026Mechanism onlyPMID:42278444View source ↗

Passeron T et al., An Investigator-Blinded, Randomized Trial of a Broad-Spectrum Sunscreen Containing Sclareolide and Niacinamide, Dermatology and Therapy (Heidelberg) 2026

2026Positive (efficacy)PMID:41240206View source ↗

Vergilio MM et al., Topical Formulation with Niacinamide Combined with 5 MHz Ultrasound for Improving Skin Ageing, Current Medicinal Chemistry 2025

2025Positive (efficacy)PMID:39171587View source ↗
Tranexamic AcidStrong evidence10 citations

Fades stubborn dark patches like melasma and deep marks left behind by acne or hormonal shifts. The one to reach for when other brighteners haven't worked.

Liang Y et al., Comparative efficacy and safety of tranexamic acid for melasma by different administration methods: A systematic review and network meta-analysis, Journal of Cosmetic Dermatology 2024 — oral TXA + topical agents most effective delivery route

2024Meta-analysis (positive)PMID:38059683View source ↗

Tranexamic Acid Ameliorates Skin Hyperpigmentation by Downregulating Endothelin-1 Expression in Dermal Microvascular Endothelial Cells, Annals of Dermatology 2024;36(3):151-162 — mechanism study showing oral TXA suppresses endothelin-1 in vascular endothelial cells

2024Mechanism onlyPMID:38816976View source ↗

Calacattawi R, Alshahrani M, Aleid M et al., Tranexamic acid as a therapeutic option for melasma management: a meta-analysis and systematic review of randomized controlled trials, Journal of Dermatological Treatment 2024;35(1):2361106 — pooled RCT evidence that tranexamic acid significantly reduces melasma severity via plasmin-inhibition of UV-triggered melanogenesis

2024Meta-analysis (positive)PMID:38843906View source ↗
+1 more ingredient
GlutathioneModerate evidence5 citations

A "master antioxidant" your body already makes. In skincare it gently lightens overall tone and helps fade pigmentation when used consistently over months.

Stanescu C et al., Glutathione in Skin Aging and Tissue Regeneration: A Systematic Review of Molecular Mechanisms, Redox Modulation, and Biomedical Implications, Molecules 2026

2026Meta-analysis (positive)PMID:41900080View source ↗

Sarkar R et al., Glutathione as a skin-lightening agent and in melasma: a systematic review, International Journal of Dermatology 2025

2025Meta-analysis (mixed)PMID:39444151View source ↗

Wahab S et al., Combination of topical and oral glutathione as a skin-whitening agent: a double-blind randomized controlled clinical trial, International Journal of Dermatology 2021;60(8):1013-1018 — 8-week RCT showed combination significantly lowered melanin and raised lightness vs placebo

2021Positive (efficacy)PMID:33871071View source ↗

Sources: 10 clinical journals and regulatory databases across the US, EU, Korea, Japan, and China. Every entry points to a specific document. See methodology for the full list and what each outcome label means.

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