Estrogen is the female hormone, but using it in hormone replacement therapy (HRT) can be a two-edged sword. Too little and menopausal symptoms aren’t relieved. Too much and breast cancer risk increases. Which hormones are natural and which are synthetic? How can I use estrogen in bioidentical hormone replacement (BHRT)? How much is safe and what’s best, the pill or patch? These questions and more are answered in the estrogen articles below. You’ll find plenty of research, questions and answers, and frequently asked questions about estrogen.