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Mandelic Acid

Generally safe·Moderate evidence

Mandelic acid is a larger-molecule alpha hydroxy acid that tends to penetrate skin more slowly than glycolic acid, which is generally associated with less stinging and redness. It carries the same general AHA cautions around sun sensitivity but is often better tolerated by reactive skin.

Worth knowing

  • Can irritate, especially left on

Questions

Is mandelic acid gentler than glycolic acid?
It is generally considered milder. Its larger molecule size slows skin penetration, and a published comparative study found fewer adverse effects with mandelic acid peels than with salicylic acid peels at the concentrations tested.
Does mandelic acid have its own safety review like glycolic acid does?
Not yet. CIR's alpha hydroxy acid assessment covers glycolic and lactic acid specifically, and mandelic acid has not had its own dedicated panel review, so the general AHA cautions around sun sensitivity still apply.

Products with Mandelic Acid

In our guides

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.