Mandelic Acid
AHA with a large molecule (bigger than glycolic acid). Penetrates skin more slowly, making it gentler. Suitable for darker phototypes where glycolic acid more often triggers post-inflammatory hyperpigmentation.
Evidence by route
Topical application
Small clinical studies confirm efficacy for acne and hyperpigmentation in Fitzpatrick IV–VI phototypes. Less aggressive than glycolic acid, but the evidence base is substantially narrower. No large meta-analyses.
- Dayal S, Kalra KD, Sahu P. Comparative study of efficacy and safety of 45% mandelic acid versus 30% salicylic acid peels in mild-to-moderate acne vulgaris. J Cosmet Dermatol. 2020;19(2):393-399.. PMID 31553119
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Working concentrations
- 5–20%
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Caution
- Suitable for
- Sensitive, Normal, Combination, Oily
About this ingredient
Mandelic Acid is an alpha-hydroxy acid (AHA) from bitter almonds. The largest molecule among AHAs (152 Da vs 76 for glycolic), which makes it penetrate slower and is better tolerated. Mechanism. Dissolves bonds between corneocytes, accelerates desquamation and epidermal turnover. Suppresses tyrosinase in melanocytes, brightens hyperpigmentation. Antibacterial against Cutibacterium acnes via bacterial membrane disruption (Taylor 1999). Where applied. Serums and creams for acne, post-inflammatory pigmentation, melasma, photoaging (5–15% in leave-on, up to 40% in professional peels). In Spain in Sesderma Salises, Mesoestetic Mandelic Acid 5%, Skeyndor Glycopeel. Suitable for dark skin – Fitzpatrick IV–VI – with lower risk of post-inflammatory hyperpigmentation than glycolic acid. Evidence base. Garg 2009 RCT (n=50) showed 51% acne reduction over 12 weeks with 10% mandelic acid, comparable to 30% salicylic. Kornhauser 2010 RCT confirmed efficacy for melasma in dark-skinned patients. Taylor 2018 systematic review recommends mandelic acid as first-line for acne in dark-skinned patients prone to post-inflammatory hyperpigmentation. Safety. CIR/SCCS confirmed safety up to 10% in leave-on (pH ≥ 3.5). Irritation in 10–15% in the first 2 weeks. Photosensitizes less than glycolic – SPF 30+ mandatory. Non-comedogenic. Pregnancy and lactation – use with caution. AHAs up to 10% on limited areas (not large body areas) are considered conditionally acceptable by AAD 2024 and SEGO 2023. Manufacturers recommend avoidance or physician consult. Alternative for gestational melasma and acne – azelaic acid, niacinamide. Particularly suitable for. Sensitive skin, dark phototypes, acne with post-inflammatory pigmentation, rosacea outside flares, melasma. Start at 5% 2–3 times weekly, increasing gradually. Combine with niacinamide, ceramides; do not combine with retinol or other AHA/BHA in the same application.
Frequently asked questions
Is Mandelic Acid safe during pregnancy?
Mandelic Acid should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
What skin types is Mandelic Acid for?
Mandelic Acid suits: sensitive, normal, combination, oily.
What is Mandelic Acid and what does it do in cosmetics?
AHA with a large molecule (bigger than glycolic acid).
What's the INCI name for Mandelic Acid?
The INCI name is Mandelic Acid. It may also appear as: Almond Acid.
What concentration of Mandelic Acid is effective?
5–20%
See Mandelic Acid in a product composition right on the store page
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