1,3-Propanediol

1,3-Propanediol is a clear, multifunctional cosmetic ingredient widely used as a humectant, solvent, and penetration enhancer. It helps attract and retain moisture in the skin, improves product spreadability, and enhances the performance of other active ingredients.

INCI Name: Propanediol

Solubility

Water-soluble

Miscible with water, alcohol, and glycerin

Recommended Usage Rate

1 – 10%

Typical usage:

Leave-on products: 2 – 5%

Rinse-off products: 3 – 10%

pH Compatibility

Stable across a wide pH range: pH 3 – 10

Compatible with most cosmetic formulations

Function

Humectant (moisture retention)

Solvent

Penetration enhancer

Texture and feel enhancer

Preservative booster

Key Benefits

For Skin:

Helps attract and retain moisture

Improves skin softness and hydration

Enhances delivery of active ingredients

Gentle and suitable for sensitive skin

For Formulations:

Improves spreadability and skin feel

Helps dissolve difficult actives

Can support preservative efficacy