1,3-Butylene glycol is a small diol used in skincare as a humectant, solvent, and viscosity modifier that helps retain moisture and improve product texture. It also has mild antimicrobial properties that can aid preservation.
| Reported effect | How often | Notes |
|---|---|---|
| Irritant contact dermatitis | Uncommon | Mild stinging or redness, more likely on compromised or sensitive skin. |
| Allergic contact dermatitis | Rare | Occasional sensitization reported in patch-test studies. |
| Transient stinging or burning | Uncommon | Usually short-lived, especially on broken or irritated skin. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.