Natural betaine (trimethylglycine), often derived from sugar beet, is a small osmolyte that attracts and retains water in the skin and helps protect cells against osmotic and environmental stress. It is used in skincare and cosmetics primarily as a moisturizing agent and to improve product mildness and texture.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Rare | Generally considered well tolerated; mild stinging or redness occasionally reported, often formulation-dependent. |
Allergic contact dermatitis | Very rare | Isolated sensitization reports; betaine is not a common contact allergen. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.