What it is
Isopentyldiol is a low-molecular-weight branched glycol used as a multifunctional solvent and humectant in cosmetics. It helps dissolve other ingredients, draws and holds moisture, and can improve the sensory feel of a formula while supporting the stability and efficacy of preservative systems. It is commonly found in Japanese sunscreen and skincare formulations.
Safety & warnings
Isopentyldiol is generally well tolerated at typical use levels and is considered a low-irritation ingredient. It is not a recognized fragrance allergen and is not comedogenic.
Origin & sourcing
Synthetic. It is a manufactured branched diol.
Questions everyone asks
What is isopentyldiol used for?
It is used as a solvent and humectant that dissolves ingredients, holds moisture, and can support a formula's preservative system.
Is isopentyldiol the same as pentylene glycol?
No. They are different glycols; isopentyldiol is a branched diol also known as 3-methyl-1,3-butanediol.