Tranexamic acid, explained
A dark-spot ingredient borrowed from medicine and now found in K-beauty serums. Here’s what the research shows for skin over 40.
Good evidence
What it is
Tranexamic acid, often shortened to TXA, is a synthetic version of an amino acid. Doctors have used it for decades, as tablets, to reduce heavy bleeding. In skincare it’s used in much smaller amounts to help fade dark spots and melasma, the patchy brown pigment that often appears in your 40s.
What the research shows
A 2026 analysis pooled 63 randomised trials. Tranexamic acid applied to the skin improved melasma, with noticeable changes from around week 8, and it was generally well tolerated.
Updated systematic review and meta-analysis, Korean Journal of Chemical Engineering, 2026 [1]
An earlier analysis of 22 trials with 1,280 patients also found it reduced melasma. Tablets had the biggest effect, followed by injections and then creams and serums, but the studies varied a lot in how they were done.
Calacattawi and colleagues, Journal of Dermatological Treatment, 2024 [2]
Most trials studied melasma rather than everyday age spots, so results for other dark marks are less certain.
Skincare or tablets?
Serums and creams with tranexamic acid are freely available, with no prescription needed. Tablets are different: they’re a medicine that affects blood clotting and isn’t suitable for everyone, so they should only be taken if a doctor prescribes them.
How to use it after 40
- Apply morning or evening after cleansing, before moisturiser.
- Give it 8 to 12 weeks before judging results.
- Wear sunscreen every day. Sun brings pigment straight back.
- It pairs well with niacinamide (the two are often combined), vitamin C and retinoids. See our pairing guide.
- Patch test first if your skin is sensitive.
We’re adding tranexamic acid products, including the Anua Niacinamide 10% + TXA 4% Serum and the Tosowoong Arbutin 7.0 + TXA 4.0 Cream, to our price comparison soon.
Sources
- Tranexamic acid for melasma treatment: an updated systematic review and meta-analysis of randomized controlled trials. Korean J Chem Eng. 2026.
- Calacattawi R et al. Tranexamic acid as a therapeutic option for melasma management: meta-analysis and systematic review of randomized controlled trials. J Dermatolog Treat. 2024.
This page is general information, not medical advice. Last updated 30 October 2026.
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