Can you use lactic acid with tranexamic acid?
The chemistry
Lactic acid improves the skin surface and, at higher strengths, deeper layers. Twice-daily 12% lactic acid for three months made skin smoother and firmer and reduced the look of lines, while 5% produced similar surface changes (Smith 1996). In a longer pilot, 25% glycolic, lactic or citric acid lotion on one forearm for about six months thickened the skin by roughly a quarter compared with placebo, without inflammation (Ditre 1996). Tranexamic acid targets melasma and dark patches. A meta-analysis of 22 randomized trials found it lowered melasma severity, with topical use behind oral and injected forms (Calacattawi 2024). The two have never been combined in a study, and nothing suggests they cancel each other out.
Chemistry
No known interaction between an AHA and tranexamic acid.
Irritation
Lactic acid can sting, especially at 10% and higher.
Order
Lactic acid, wait until dry, tranexamic acid, moisturizer.
Common mistakes
Using a 25% lactic lotion because a study did is a common jump. The Ditre trial was on forearms, not faces, and was supervised. Face products in the 5% to 10% range are a safer start, and the FDA notes safety panel limits of 10% or less for consumer AHA products (FDA AHA page). Another error is expecting the acid to fade melasma on its own; tranexamic acid is the ingredient with trial data for that here. Keep daily sunscreen, since AHAs raise sunburn risk.
Your routine
Morning
- Gentle cleanser
- Tranexamic acid serum
- Moisturizer
- Broad-spectrum SPF 30+
Evening
- Cleanse and dry
- Lactic acid 2 to 3 nights a week
- Tranexamic acid serum
- Moisturizer
Sample week
Fine every morning too.
Go slower if
Hold off the acid on sunburned, cracked or freshly waxed skin. See a dermatologist for melasma that keeps spreading despite treatment.
Evidence strength
Limited for the pair. Lactic acid has controlled human data (Smith 1996; Ditre 1996), and tranexamic acid has a meta-analysis (Calacattawi 2024).
Products with lactic acid
The Ordinary Lactic Acid 10% + HA
Picked for lactic acid
10% lactic acid paired with glycerin and hyaluronic acid crosspolymer.
Buy on Amazon (opens in a new tab)FAQ
Does lactic acid fade dark spots?
Our sources show texture and firmness changes, not pigment results (Smith 1996). Tranexamic acid is the pigment step here.
Is a 25% lactic acid lotion safe for my face?
The 25% study used forearms (Ditre 1996). The FDA page describes 10% or less as the consumer safety limit.
Can I use both on the same night?
Yes, acid first, then tranexamic acid once the acid has dried.
Why use sunscreen for a week after stopping lactic acid?
The FDA's AHA sunburn alert advises it, because sun sensitivity lasts a short while after you stop.
Related combinations
- RetinolYes
- Vitamin CYes
- NiacinamideYes
- RetinolYes, with timing
- TretinoinYes
- Vitamin CYes, with timing
- NiacinamideYes
- Salicylic AcidYes
Sources
- Smith WP. Epidermal and dermal effects of topical lactic acid. J Am Acad Dermatol. 1996;35(3 Pt 1):388-391.
- Ditre CM, Griffin TD, Murphy GF, et al. Effects of alpha-hydroxy acids on photoaged skin: a pilot clinical, histologic, and ultrastructural study. J Am Acad Dermatol. 1996;34(2 Pt 1):187-95.
- 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;35(1):2361106.
- U.S. Food and Drug Administration. Alpha Hydroxy Acids. Cosmetic ingredients. Content current as of 11/22/2022.