一種存在於皮膚的脂肪酸，可以作為清潔劑或增稠劑，在清潔劑中，可能會與產品的其他成分及酸鹼質造成皮膚過度乾燥，在保濕產品中，它可以強化皮膚的天然障壁功能，讓皮膚更光滑。與強鹼類皂化後即形成肥皂。
A kind of fatty acid existing in the skin can be used as a cleanser or thickener. In the cleanser, it may cause excessive dryness of the skin with other ingredients and acid-base of the product. In moisturizing products, it can strengthen the natural barrier function of the skin and make the skin smoother. Soap is formed after saponification with strong alkali.
ref.
Biophysical Chemistry, August 2010, pages 144-156
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