Lactic Acid
2-hydroxypropanoic Acid, Milk Acid
Formula: C3H6O3 Molecular Weight: 90.08 Cas No:50-21-5
Buffering agent; Humectant; Skin conditioning; Astringent.

One of the mild fruit acid (Alpha Hydroxy Acid), which is commonly extracted from dairy products, can inhibit the formation of tyrosinase to achieve the effect of lightening spots and whitening, and can make the outer layer of the skin The viscous substance is soft and exfoliates. It has the functions of promoting cell regeneration and whitening, often used in skin products and is slightly irritating. Some people will produce red spots after using it.

In general, the acidity is usually adjusted to medium to weak acidity. If the formula containing fruit acid is not emphasized, it can only be regarded as an acid-base regulator and has no real effect of fruit acid [1].
[1] 張麗卿,『我就是化妝品化達人』,健行出版社,2007/04/10。
Chemical formula
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Lactic Acid 的 cas no:為50-21-5沒錯

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Natural products avoid to use Lactic acid.

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Reference:藥妝品學 Cosmeceuticals, 2nd edition

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