1,2-Hexanediol (commonly written 2-hexanediol) is a multifunctional diol used in skincare primarily as a humectant, solvent, and preservative-enhancing agent that improves the antimicrobial efficacy of formulations. It is generally well tolerated and considered a base/formulation ingredient rather than a treatment active.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient skin irritation or stinging | Uncommon | More likely at higher concentrations or on compromised skin barriers. |
| Contact dermatitis / allergic sensitization | Rare | Occasional case reports; patch testing can confirm. |
| Eye irritation on accidental contact | Uncommon | Relevant mainly in leave-on or rinse-off products near the eye area. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.