Ingredient
Propylene Glycol
1,2-Propanediol
Propane-1,2-diol
What it is
A small synthetic diol widely used as a humectant and solvent that helps other ingredients dissolve and keeps formulas from drying out.
How it works
Its two hydroxyl groups hydrogen-bond with water, drawing and holding moisture at the skin surface, while also acting as a carrier solvent that improves the solubility and spreadability of other ingredients.
What it does
Humectant
Solvent
Skin conditioning
Concerns to know
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Potential irritant
May cause irritation for sensitive skin, particularly at higher concentrations.