Betaine Anhydrous is a naturally derived amino acid derivative (trimethylglycine) used in skincare as a humectant and osmoprotectant, helping to attract and retain moisture while protecting cells against osmotic stress. It also imparts a smooth, conditioning feel and can reduce irritation potential of surfactant-based formulas.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient stinging or irritation | Rare | Generally well tolerated; minor irritation possible in sensitive individuals. |
Allergic contact dermatitis | Very rare | Isolated sensitization reports; uncommon for this ingredient. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.