Is propylene glycol safe for human health? Can it for example give me a migraine, cause erythema or other allergic reactions?
There might be very individual personal conditions in a body that result in a highly sensitive reaction to any kind of chemical substance. However, propylene glycol USP/EP (pharmaceutical grade) has been safely used for decades in a large variety of consumer products, including more than 4000 cosmetics and toiletry products. Over this long period of time and large of variety of products there has been no evidence of such effects.
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