Tests show it can be a strong skin irritant.
MSDS on Propylene Glycol warns to avoid skin contact as it is systemic and can cause liver abnormalities and kidney damage. Alcohol A colorless, volatile, flammable liquid produced by the fermentation of yeast and carbohydrates. Alcohol is used frequently as a solvent and is also found in beverages and medicine. As an ingredient in ingestible priducts, alcohol may cause body tissues to be more vulnerable to carcinogens. Mouthwashes with an alcohol content of 25 percent or more have been implicated in mouth, tongue, and throat cancers.