Researched by Helena DeMaria-Williams
Formula IngredientHumectant, SolventINCI: 1,2-Hexanediol
1,2-Hexanediol is a short-chain diol (two hydroxyl groups on a six-carbon chain) used in cosmetics as a humectant, solvent, and antimicrobial booster. It helps retain moisture in the skin and contributes a soft, pleasant skin feel. It is also widely used to enhance the efficacy of traditional preservatives, allowing formulators to reduce their concentration.
Category
Humectant, Solvent
Irritation Risk
Low
Skin Types
all skin types, oily, acne-prone, sensitive, combination, dry
moisturisation, skin conditioning, solvent for active ingredients, antimicrobial preservative boosting, improves skin feel, pigment dispersion in makeup
Well-tolerated at cosmetic concentrations (typically 0.5–2%). No EU CosIng Annex II or III restrictions apply. At higher concentrations it may cause mild transient irritation, but this is uncommon in standard formulations. Sensitisation potential is considered very low.
1,2-Hexanediol does not increase photosensitivity. No sun protection precautions are needed based on its presence in a formulation.
No specific reproductive or developmental toxicity concerns have been identified in cosmetic use databases. However, dedicated pregnancy safety studies are limited. At typical cosmetic concentrations (0.5–2%), systemic absorption is very low and risk is considered minimal. Consult a healthcare provider if concerned.
1,2-Hexanediol is a short-chain diol (two hydroxyl groups on a six-carbon chain) used in cosmetics as a humectant, solvent, and antimicrobial booster. It helps retain moisture in the skin and contributes a soft, pleasant skin feel. It is also widely used to enhance the efficacy of traditional preservatives, allowing formulators to reduce their concentration.