The Sex Change Shampoo: A worrisome finding: Certain grooming products may lower testosterone, increasing your risk of heart disease, erectile dysfunction, and ...boobs! After studying young men with breast-tissue development, National Institutes of health researchers discovered that each had been using a lotion, soap, or shampoo containing lavender or tea-tree oil. The oil causes an increase in estrogen (a female hormone) while decreasing androgens (male hormone). Been lathering up? stay calm: Quit, and any side effects will dissappear in a few months.