What is it?
A widely-used preservative considered safer than parabens. Generally well-tolerated at standard concentrations (1% or less) but can cause reactions in sensitive individuals.
Concerns
Rare skin sensitization, potential irritant for eczema-prone skin at higher concentrations
Commonly Found In
Most "clean" beauty products
moisturizers
serums
sunscreens
Safer Alternatives
Sodium Benzoate + Potassium Sorbate combination