Diglycerin

Humectant that boosts hydration within skin

Can also be used as a solvent or to improve foaming properties of a formula

Related to glycerin but noted as less sticky

May offer longer-lasting hydration than glycerin due to its higher molecular weight

Diglycerin is a highly beneficial ingredient for individuals with dry or dehydrated skin, thanks to its humectant properties that enhance water retention within the skin. Besides its moisturizing capabilities, diglycerin serves as an effective solvent and can improve the viscosity of foam in personal care products. You can find this versatile ingredient in various products such as cleansers, lotions, shaving creams, shampoos, and makeup items.

Created by bonding two glycerin molecules together, diglycerin suppliers claim it provides longer-lasting hydration compared to glycerin, owing to its higher molecular weight, which slows down penetration and allows it to remain on the skin for an extended period. Additionally, diglycerin is less sticky than glycerin, contributing to a more aesthetically pleasing user experience. That said, cosmetic chemists familiar with glycerin’s aesthetic drawbacks know how to combine it with other ingredients, such as dimethicone, for an improved sensorial experience.

While the Cosmetic Ingredient Review (CIR) has not yet finalized their safety report on diglycerin, it is helpful to note that previous assessments for glycerin by the CIR concluded it as safe for cosmetic use. As of 2022, the highest reported concentration of diglycerin usage was 28% in skin cleansing products and up to 5% in non-spray face and neck products.

In its raw form, diglycerin is a colorless to slightly yellow viscous liquid at room temperature.

See: Glycerin