Modern research shows douching is very unhealthy for a woman’s hygiene. It unbalances a woman’s pH, which is self-cleaning.^\9]) Many antiseptic douche products being sold at the time contained very strong chemicals, such as mercury), and packaging provided little information on how to reduce the effect of the chemicals. Many women felt that the stronger the mixture, the more likely it would be to prevent pregnancy, which increased the health risks. In addition to mercury, there were various other chemicals being used as birth control, and these different solutions could result in burns to a woman’s vagina, ectopic pregnancies, and other serious effects that could potentially lead to hospitalization.

Ah, yes. Good 'ol mercury. That said, at least it's not crocodile dung.