What is Malic Acid?
Malic Acid is an alpha hydroxy acid (AHA) found naturally in apples and many other fruits. The name comes from the Latin word for apple. It is what gives green apples their sour taste.
In skincare, malic acid is rarely the only acid in a product. It is most often used as one part of a multi-acid blend, where it adds to exfoliation and helps balance the formula's pH. It is usually described as gentler than glycolic acid.
Source
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Found in |
Malic Acid (INCI name) |
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Origin |
Occurs naturally in apples and other fruits; cosmetic grade is typically produced synthetically or by fermentation |
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Also known as |
AHA, fruit acid, apple acid |
Top features and benefits
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Gently loosens dead skin cells |
Often used in multi-acid blends |
Helps support formula pH |
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Generally milder than glycolic acid |
Can help smooth rough texture |
Part of the AHA family |
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Natural fruit-acid origin |
Found in toners, serums and peels |
Works at low strengths |
How Does It Work?
Like other AHAs, malic acid works by loosening the glue that holds dead cells to the skin's surface. Once the dull outer layer sheds, skin feels smoother and can look brighter. The effect builds gradually with regular use.
Malic acid's molecules are bigger than glycolic acid's, so it is generally thought to act more slowly and cause less stinging. It is also often mixed with other acids, such as glycolic or lactic acid, so that each acid can be used at a lower level while exfoliation stays balanced.
Beyond this, there is not much independent research on malic acid alone. Most of what is known comes from the wider AHA research and from how formulators use it, so it is sensible to treat it as a supporting acid rather than a proven standalone treatment.
Research note: Much of what is published about malic acid's strength and typical use levels comes from brand-authored pages rather than independent trials. This page therefore avoids quoting specific percentages and relies on the wider AHA literature.