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solvent · humectant

Methylpropanediol

Generally safe·Moderate evidence

A small glycol used as a solvent and to boost the absorption of actives, and to help preservatives work at lower levels. It is well tolerated and graded low concern in published assessments.

Questions

What is methylpropanediol used for in skincare?
Methylpropanediol is a humectant and preservative booster that draws moisture into the skin and supports formula stability. It is commonly used in serums, toners, and hydrating products.
Is methylpropanediol safe in cosmetics?
Published safety reviews do not identify concerns with methylpropanediol at typical skincare concentrations. It is similar to glycerin in function but offers a lighter feel and better spreadability in formulas.
Does it have any side effects?
At standard use levels, published data does not document broad adverse effects. Some individuals may experience mild stinging if applied to broken skin or at unusually high concentrations; patch testing is reasonable if you have reactive skin.

Products with Methylpropanediol

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.