Mandelic Acid
- Effective dose
- 5–10 %
- Evidence
- 3/5· Moderate
Last updated June 1, 2026
What it is
Mandelic acid is an alpha hydroxy acid derived from bitter almonds with a relatively large molecule. Its size slows penetration into the skin, so it exfoliates dead surface cells and helps regulate keratinization more gradually than smaller AHAs, which tends to make it better tolerated on sensitive skin.
Benefits
Improves acne, uneven texture, and post-acne hyperpigmentation; leave-on products typically use about 5-10%, while in-office peels are studied at much higher strengths (around 30-45%).
When to take it
Best applied at night, with broad-spectrum SPF the next morning because AHAs raise UV sensitivity. Introduce slowly and increase frequency as the skin adjusts.
Side effects
May cause mild stinging, dryness, or redness, though irritation and post-inflammatory hyperpigmentation tend to be lower than with stronger AHAs. As an AHA, it increases sun sensitivity.
Sources
Products containing Mandelic Acid
No products in our database contain this ingredient yet.