Faex (yeast) extract is derived from yeast fermentation and is rich in amino acids, peptides, beta-glucans, vitamins, and minerals. It is used in skincare to hydrate, soothe, and support skin barrier function, with some claimed antioxidant and skin-smoothing benefits.
| Reported effect | How often | Notes |
|---|---|---|
| Mild irritation or stinging | Uncommon | Transient sensation, more likely on sensitive or compromised skin. |
| Contact allergy / allergic dermatitis | Rare | Possible in individuals sensitized to yeast-derived proteins. |
| Redness or flare in yeast-sensitive or seborrheic-prone skin | Rare | Reported anecdotally; clinical evidence limited. |
| Systemic hypersensitivity reaction | Very rare | Isolated cases in highly yeast-allergic individuals. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.