Propylene glycol
Propylene glycol has a long history of safe use. It is used as a humectant and skin conditioning agent in a very wide range of cosmetic, and pharmaceutical, products. Its use in such products is without risk of harm to human health.
It is often quoted that this is an ingredient used in antifreeze. This may or may not be true, but water too is a component of antifreeze. Neither fact is relevant to cosmetic safety, just as the corrosive nature of acetic acid is not relevant in its use as the food 'vinegar'. In fact this claim about propylene glycol is often confused with ethylene glycol, which is the main constituent of common anti-freeze mixtures for motor cars.
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