Ye
Yeast Extract
Yeast Extract
An extract of yeast; the name doesn’t say which yeast it’s from.
What it does
It’s made from yeast cells that are broken open and inactivated, so nothing in it is alive. Products list it to protect and condition skin.
The evidence, graded
expert consensusUS safety reviewers (2024) assessed 56 yeast ingredients, used mostly to protect or condition skin. Yeast extract is a general name that doesn’t say which yeast it comes from. They judged it and 21 other general names safe as used when made from a yeast in their report with both food-use and skin-allergy data. Patch tests of a lotion with 0.0045% yeast extract on 52 people, and of extracts of several named yeasts on 100 or more, found no allergy.Cosmetic 2024 · Cosmetic Ingredient Review ↗
Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.
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