Yeast extract is a biologically active ingredient derived from yeast cells, rich in amino acids, peptides, vitamins, and beta-glucans. It is used in skincare for its hydrating, soothing, and skin-conditioning properties and is sometimes claimed to support skin barrier function and wound healing.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation (redness, stinging) | Uncommon | Most often mild and transient, especially in sensitive skin. |
Allergic contact dermatitis | Rare | Possible in individuals sensitized to yeast-derived proteins. |
Flare in yeast-sensitive or seborrheic-prone skin | Rare | Reported anecdotally; clinical evidence limited. |
Systemic hypersensitivity reactions | Very rare | Exceptional; mainly relevant to those with known yeast allergies. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.