Propylene Glycol
Not used — health & safety concerns
Propylene glycol is a synthetic humectant and solvent widely used in personal care, cleaning products, food, and pharmaceuticals. While generally regarded as safe by the FDA, it is a documented contact allergen and not the best fit for plant-derived formulations. This page covers what propylene glycol is, where it appears, the dermatological sensitization data, and why Natural Flower Power uses vegetable glycerine instead.
