Tyrosine is an amino acid that serves as the natural substrate for melanin synthesis in the skin. In cosmetics it is sometimes added to tanning products with the claim of promoting or accelerating pigmentation, though topical efficacy is poorly supported by evidence.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or redness | Rare | Occasional sensitivity at site of application, generally transient. |
Contact allergic reaction | Very rare | Isolated reports; uncommon as a sensitizer. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.