Yeast extract is a biologically active ingredient derived from yeast cells (commonly Saccharomyces), rich in amino acids, peptides, beta-glucans, vitamins, and minerals. It is used in skincare for its soothing, hydrating, antioxidant, and skin-conditioning properties, and may support barrier function and the appearance of skin.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or stinging | Uncommon | Transient redness or tingling possible, especially on sensitive skin. |
Allergic contact dermatitis | Rare | Sensitization to yeast-derived proteins or other components can occur in predisposed individuals. |
Flare in individuals with yeast sensitivity | Rare | Those with known yeast hypersensitivity may react to topical exposure. |
Acneiform or follicular reactions | Very rare | Rarely reported; relationship to ingredient unclear and formulation-dependent. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.