“Preservative chemicals found in samples of breast tumours probably came from underarm deodorants, UK scientists have claimed.

Their analysis of 20 breast tumours found high concentrations of para-hydroxybenzoic acids (parabens) in 18 samples. Parabens can mimic the hormone estrogen, which is known to play a role in the development of breast cancers. The preservatives are used in many cosmetics and some foods to increase their shelf-life.” —New Scientist