Faex Extract (yeast extract) is derived from yeast cells, typically Saccharomyces, and is used in skincare for its skin-conditioning, soothing, and antioxidant properties due to its content of amino acids, beta-glucans, vitamins, and minerals. It is often included to support skin barrier function and hydration.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation (redness, mild stinging) | Uncommon | May occur in sensitive individuals or at higher concentrations. |
| Allergic contact dermatitis | Rare | Sensitization to yeast-derived proteins has been reported in isolated cases. |
| Worsening of yeast-sensitive conditions (e.g., seborrheic dermatitis flares) | Rare | Theoretical concern in individuals reactive to Malassezia/yeast components; limited evidence. |
| Urticaria / immediate hypersensitivity | Very rare | Isolated reports, typically in those with known yeast allergy. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.