What Is Methylpropanediol? Methylpropanediol is a skincare and cosmetic ingredient that is used as a solvent and to enhance the absorption of ingredients such as salicylic acid. Methylpropanediol also has the added benefit of hydrating the skin, leaving the skin looking hydrated, dewy, and smooth.  Methylpropanediol is part of a group of compounds called alkane … Continue reading Is Methylpropanediol Safe?