What it is
Erythritol is a small, highly water-soluble polyol that binds moisture and can give formulas a light, fresh feel along with a mild cooling sensation as it dissolves. In sunscreens and other leave-on products it functions primarily as a humectant and skin-conditioning agent, often paired with other polyols such as glycerin. It is non-volatile and contributes to the sensory and hydration profile rather than to UV protection.
Safety & warnings
Erythritol is generally well tolerated on skin and is not considered a common sensitizer or comedogenic at typical use levels. It is a small humectant rather than an oil, so it poses little pore-clogging concern.
Origin & sourcing
Erythritol is typically produced by fermentation of glucose derived from corn or other starches using yeast or fungi, making the cosmetic-grade material a fermentation-derived ingredient. It also occurs naturally in some fruits and fermented foods.
Questions everyone asks
What does erythritol do in a sunscreen?
It acts as a humectant, helping the formula attract and retain water so the product feels hydrating and pleasant on the skin.
Is erythritol the same as the sugar substitute?
Yes, it is the same sugar alcohol used as a sweetener in foods; in cosmetics it is used for its water-binding properties rather than for taste.