Hydrogenated starch hydrolysate is a thick, syrup-like ingredient manufactured from starch. It is first chopped up by enzymes into smaller chunks and then it undergoes a chemical process called hydrogenation. The resulting syrup contains a mixture of sweet-tasting sugars and sugar alcohols.
It is used in concentrations of up to 4% in skincare products and serves as a film-forming ingredient that can also bind water to the skin’s surface (humectant).
Some manufacterures claim it is also able to reduce irritation caused by cleansing agents in the formula.
Science
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CIR Safety Comittee (2015). Safety Assessment of Polysaccharide Gums as Used in Cosmetics.