Ingredient profile

Exfoliating acid · best used PM

• Keep mandelic acid apart from AHA/BHA peel.
• Use mandelic acid at a different time of day from retinol, tretinoin, adapalene, vitamin C, benzoyl peroxide or copper peptides, one in the morning and the other at night.
• Mandelic acid with glycolic acid, lactic acid, salicylic acid, azelaic acid, bakuchiol or kojic acid needs care: start slowly or alternate days.
• Mandelic acid sits happily next to niacinamide, hyaluronic acid, ceramides, peptides, vitamin E, ferulic acid, sunscreen, tranexamic acid, alpha arbutin, snail mucin, centella asiatica, squalane and moisturizer.

461

Mixes freely13

Needs timing6

Needs care6

Not together1

What it does

Mandelic acid is a hydroxy acid used as a chemical peel and in leave-on exfoliants. It has antibacterial and anti-inflammatory properties, which is why it has emerged as a peeling agent for acne. Reviews of hydroxy acids list uses in photoaging, acne, pigmentation disorders and other skin conditions.^[1]

Strengths

• In a randomized trial of 50 people with mild to moderate acne, six 45% mandelic acid peels two weeks apart worked about as well overall as 30% salicylic acid peels, with fewer side effects.^[1]
• In that trial salicylic acid did better on blackheads and whiteheads, while mandelic acid had the edge on inflamed spots.^[1]
• In 44 people with acne and post-acne marks, a 20% salicylic plus 10% mandelic acid peel beat a 35% glycolic acid peel for active acne and pigmentation, with fewer side effects.^[2]
• For dark circles, a 70-person study found both 30% mandelic and 30% lactic acid peels improved pigmentation, but lactic acid did better and caused less irritation.^[3]

Who it suits

Mild to moderate acne, especially inflamed spots, and marks left after breakouts. The peel studies were done in Indian patients, which is useful data for medium to darker skin tones.

Who should skip

It is still an acid. FDA advises sun protection for AHA products during use and for a week after, and stopping if a product burns or causes a rash. In the dark circle study, irritation was more frequent with mandelic acid than with lactic acid.^[2]

How to start

1. The strongest data come from in-clinic peels at 30 to 45%, given every two weeks for several sessions. Home serums are far weaker, so the study results do not transfer directly.^[1][3]
2. For post-acne marks, the combination peel in the glycolic comparison paired 20% salicylic acid with 10% mandelic acid and was given every two weeks for six sessions. Both peels helped, but the combination did better on active spots and pigmentation, which is why clinics often use mandelic acid in blends rather than alone.^[2]
3. Around the eyes, results in the 70-person study came after three peels at weeks 0, 2 and 4. Side effects in both groups were mild redness and swelling, with more peeling from lactic acid and more irritation from mandelic acid. The authors noted the study was small and short and called for larger trials.^[3]
4. FDA recommends sunscreen, protective clothing and limited sun while using an AHA product and for a week afterwards.^[5]
5. Because salicylic acid suited blackheads and mandelic acid suited inflamed spots in the head-to-head trial, the two are often sold together; see their pair page.^[1]
6. For combining it with other acids, see the glycolic and lactic acid pair pages.
7. If you use a retinoid or benzoyl peroxide, the pair pages cover scheduling.

Which mandelic acid products to buy

Verified listings whose published ingredient lists carry mandelic acid and none of the actives that clash with it. Each product page shows what else it mixes with.

Pairing grid

In tracked products

1 of the 144 products we track list mandelic acid as a key active; In their ingredient lists it sits at a median position of #2, from #2 in mandelic acid 10% + HA to #2 in mandelic acid 10% + HA; It is among the first five ingredients in 1 of them, meaning a main ingredient rather than a trace; The actives it most often shares a bottle with: hyaluronic acid (1); Water is the first ingredient in 1 of them; the rest are oil, silicone or solvent-based. Product by product: Mandelic Acid 10% + HA lists it at #2 of 10 next to a stated 10% on the label.

Moisturizer order

Before moisturizer. Full layering steps.

Guides

All tracked products with mandelic acid

Sources

Products with mandelic acid, in pairs

• The Ordinary Niacinamide 10% + Zinc 1% + The Ordinary Mandelic Acid 10% + HAYes
• Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant + The Ordinary Mandelic Acid 10% + HAYes, with care
• The Ordinary Mandelic Acid 10% + HA + The Ordinary Retinol 0.5% in SqualaneYes, with timing