Mandelic Acid: The Slower-Moving AHA, Explained
Mandelic acid is an AHA with a bigger molecule than glycolic acid, so it moves into skin more slowly. Studies on acne-prone skin have used it at 5% to 10%.
TL;DR
- What it does. It loosens dead cells on the surface, so skin looks smoother and clearer.
- Why people like it. Its larger molecule means it moves in slowly and evenly, which is why it is often a first AHA.
- How much. Studies on acne-prone skin used 5% to 10%. The CIR benchmark for AHAs is 10% at a pH of 3.5 or higher.
- Who it suits. Oily or congested skin, and people curious about AHAs who want to start slowly.
- The catch. Slower is not risk-free. Patch test, wear SPF, and ask your GP first if you are pregnant or breastfeeding.
- In our range. We do not use it. Our AHA/BHA range is built as a blend of other acids.
What is mandelic acid?
Mandelic acid is an alpha hydroxy acid (AHA) first isolated from bitter almonds. Its name comes from the German word for almond.
It sits in the same family as glycolic acid and lactic acid. The difference is size: mandelic acid has a larger molecule, so it moves into skin more slowly.
What does mandelic acid do for skin?
Like other AHAs, mandelic acid loosens the bonds between dead skin cells on the surface. That helps skin look smoother and more even, and it helps keep pores clearer.
Researchers describe its slow, even movement into skin as the reason it suits more sensitive routines. It is a good first step into exfoliating acids, not a skip-the-sunscreen shortcut.
Want an exfoliating routine without picking the acid yourself? Our AHA/BHA Exfoliating Tonic blends lactic, glycolic, malic, tartaric and salicylic acids with gluconolactone. It is not for use during pregnancy or breastfeeding.
Not sure where to start? Take the skin quiz.
How strong is mandelic acid, and is it safe?
The Cosmetic Ingredient Review (CIR) reaffirmed in 2017 that glycolic and lactic acid are safe in cosmetics at up to 10%, at a final pH of 3.5 or higher, with sun-protection measures. Mandelic acid is not named in that conclusion, so treat the figure as a benchmark for the AHA family rather than a mandelic acid rule.
Studies on acne-prone skin used mandelic acid at 5% and 10% in everyday cosmetic formulas. Professional peels use higher strengths and belong in a clinic.
Exfoliating acids make skin more sun-sensitive. Wear SPF 30 or higher every morning while you use them.
Who should use mandelic acid, and who should skip it?
Mandelic acid suits oily, congested or bumpy skin, and anyone who wants to try an AHA without starting at the deep end. Begin with a low strength and add it to your routine slowly.
Skip it if your skin is irritated, sunburnt or broken. If you are pregnant or breastfeeding, ask your GP or pharmacist before adding any exfoliating acid.
How do you use mandelic acid?
Follow the directions on the product. Most mandelic acid products are leave-on serums or toners used on clean skin.
Add one acid at a time, and use it only as often as your skin stays comfortable. Moisturise and wear SPF 30 or higher every morning.
What pairs well with mandelic acid?
Niacinamide, hyaluronic acid and panthenol are comfortable partners, because they support hydration while the acid works on the surface. A simple moisturiser after it keeps the routine easy.
Avoid stacking it with other exfoliating acids or retinoids on the same night. Our AHA vs BHA vs PHA guide explains how the different acid families compare.
What does the research say?
A 2015 study in Dermatology Review followed 60 people with papulo-pustular acne for two months. One group used a 5% mandelic acid product and the other used 10%, and both groups improved, though there was no placebo group.
A 2019 randomised study in the Journal of Cutaneous and Aesthetic Surgery compared professional peels in 45 people with acne and post-acne marks. A peel combining 20% salicylic acid with 10% mandelic acid cut acne scores by about 74%, and all three peels tested helped.
Both studies were small and used higher or professional strengths in places. They suggest mandelic acid is worth trying, not that it replaces a plan from your doctor.
Do we use mandelic acid in our products?
We do not currently use mandelic acid in any Dope Skin Co product.
Our formulator builds the AHA/BHA range as a blend, and no single acid is the hero. The AHA/BHA Exfoliating Tonic lists lactic, glycolic, malic and tartaric acids with salicylic acid and gluconolactone.
FAQ
Is mandelic acid good for sensitive skin?
Its larger molecule moves in more slowly, which is why people with reactive skin often start here. Slower is not the same as risk-free, so patch test first.
What is the difference between mandelic acid and glycolic acid?
Glycolic acid has the smallest molecule in the AHA family and works fastest, so it tends to be more intense. Our glycolic acid guide covers it in detail.
Can you use mandelic acid with salicylic acid?
They are paired in the studies above and in clinic peels. At home, introduce one at a time and build up slowly. Our salicylic acid guide explains where it fits.
Does mandelic acid help with dark marks?
The 2019 study saw post-acne marks improve with all three peels tested. Mandelic acid is a supporting player there, and sunscreen does most of the heavy lifting.
Is there a gentler plant-derived acid to try?
Phytic acid is a milder, plant-derived option that appeared as one of the peels in that same 2019 study. Our phytic acid guide covers how it compares.
Related ingredients
Sources
- Cosmetic Ingredient Review, Alpha hydroxy acids re-review conclusion, International Journal of Toxicology 2017
- Debowska et al., Mandelic acid cosmetic formulations for acne skin care, Dermatology Review 2015
- Sarkar et al., Glycolic acid, salicylic-mandelic acid and phytic acid combination peels, Journal of Cutaneous and Aesthetic Surgery 2019
