Malic Acid for Skin: What It Does and Who It Suits
Malic acid is a supporting acid, not a star. It's an alpha hydroxy acid (AHA) that helps set a formula's pH and adds to an exfoliating blend, but it's much less studied for skin than glycolic or lactic acid, so we'd never choose a product for malic acid alone.
What is malic acid?
Malic acid is an AHA, the same family as glycolic and lactic acid. In skincare it turns up in exfoliating formulas and helps set a product's pH. The Cosmetic Ingredient Review (CIR) lists its cosmetic functions as a fragrance ingredient and a pH adjuster.
What does malic acid do for skin?
It helps set the pH. In a 2022 amended safety assessment, the CIR Expert Panel lists malic acid as a fragrance ingredient and a pH adjuster, and sodium malate as a skin-conditioning humectant. Acids are used to bring a formula to the pH range it needs, and that matters most in exfoliating formulas.
It adds to the exfoliating blend. AHAs as a group are used to loosen the bond between dead cells at the skin surface so they shed more easily. Most of the published research is on glycolic and lactic acid, so we don't credit malic acid with a specific result on its own.
What it isn't. Malic acid is not a hydrator, a retinoid or a brightener in its own right. In a formula it's one part of a blend.
Why we use malic acid
Our formulator builds the AHA/BHA range as a blend, and no single acid is the hero. The exfoliating effect comes from the formula as a whole rather than from one acid. Malic acid is part of that team.
Who is malic acid good for?
Exfoliating acids tend to suit people who want smoother-feeling skin and who tolerate other AHAs well, used in a product designed with sensible directions.
Care is needed in a few cases:
- Sun exposure. The US Food and Drug Administration notes that applying AHAs to the skin increases UV sensitivity. The increase is reversible and doesn't last long after stopping. Use sun protection while using these products.
- Irritated or broken skin. Avoid exfoliating acids on skin that's already sore, stinging or compromised.
- Several exfoliants at once. Layering multiple acids, scrubs or retinoids can add up. Introduce one change at a time.
- Reactive skin or a skin condition. Patch test first and speak with a doctor or pharmacist. Our patch testing guide shows how.
How do you use it?
Malic acid lives inside a formulated product, so the directions on that product decide your routine. With any exfoliating acid:
- Start slowly and build up only as your skin tolerates it.
- Follow with a moisturiser.
- Wear sunscreen every morning.
- If your skin stings, turns red or feels tight, stop and go back to a simple routine.
Our guide to how often to exfoliate covers frequency in more depth.
What does it pair with?
Malic acid is commonly formulated with other AHAs such as glycolic acid and lactic acid, with salicylic acid (a BHA), and with soothing and hydrating ingredients so the formula stays comfortable. Our AHA vs BHA vs PHA guide explains how the groups differ.
What to avoid stacking: other exfoliating acids, scrubs and retinoids in the same routine without a plan. That's a general rule for all exfoliants, not something specific to malic acid.
What does the research say?
The short version: very little skin research on malic acid itself, mostly safety-panel assessment.
- Burnett et al., Amended Safety Assessment of Malic Acid and Sodium Malate as Used in Cosmetics (CIR Expert Panel, Int J Toxicol, 2022): concluded safe in cosmetics in the present practices of use and concentration, with malic acid listed as a fragrance ingredient and pH adjuster.
- Alpha Hydroxy Acids (US FDA): explains that AHAs increase UV sensitivity and describes the CIR conclusion for glycolic and lactic acid products.
These sources assess the ingredient in general. They don't measure the effect of any Dope Skin Co product.
Safety and regulation
The CIR Expert Panel concluded that malic acid and sodium malate "are safe in cosmetics in the present practices of use and concentration" described in the 2022 report. The report did not set a concentration limit, pH condition or sun protection condition for malic acid.
In the industry survey it cites, malic acid was reported at up to 2.1% in leave-on products (the maximum was in a hair spray) and up to 4% in rinse-off products. The report also notes malic acid and sodium malate are not restricted under the EU rules governing cosmetic products.
A separate, older CIR conclusion on glycolic and lactic acid is often quoted. As described by the FDA, it says products containing them are safe for consumers when the AHA concentration is 10% or less, the final pH is 3.5 or higher, and the product protects skin from increased sun sensitivity or directs daily sun protection. That conclusion was for glycolic and lactic acid, so it doesn't apply to malic acid.
Malic acid in Dope Skin Co products
Malic acid is listed in three of our exfoliating products:
In each, it sits alongside lactic acid, glycolic acid, salicylic acid, citric acid, gluconolactone and tartaric acid, with niacinamide, panthenol and hydrating ingredients. We make our products in-house in Sydney. Follow the directions on each product page, which set the frequency and the order of use.
Not sure where to start? The Dope Skin Co skincare quiz takes about two minutes.
Frequently asked questions
Is malic acid an AHA?
Yes. It's an alpha hydroxy acid, the same group as glycolic and lactic acid.
Is malic acid as strong as glycolic acid?
We won't rank them. How an acid feels depends on its level and the formula's pH, not only the acid's name.
Does malic acid make skin more sensitive to the sun?
AHAs as a group do. The FDA notes that AHAs increase UV sensitivity, so daily sunscreen is part of using them.
Is malic acid from apples?
Not necessarily. The CIR report describes the L-isomer of malic acid as a naturally occurring metabolite of plants, while DL-malic acid is made synthetically. A label doesn't say which form is used, so if the source matters to you, ask the brand.
Can I use malic acid with retinol?
Follow the directions for your specific products. Exfoliating acids and retinoids can add up for some people, so introduce one change at a time.
