Medically reviewed by Isabel Casimiro, MD, PhD Key Takeaways Progesterone is a female sex hormone that plays a vital role in the menstrual cycle, ovulation, fertility, and pregnancy.While there isn’t ...

This article was reviewed by Julia Switzer, MD, FACOG. If you’re entering perimenopause or menopause, you’ve probably heard about hormone replacement therapy (HRT) — and you might be wondering about ...