Sara Szal, MD (formerly Gottfried), is a Harvard-, MIT-, and UCSF-trained physician and four-time New York Times bestselling author with over 30 years of clinical practice and research in women's hormonal health and longevity. She writes about what conventional medicine has missed about female physiology, from hormonal dysregulation to the gap between what women's bodies can do and what the medical system has taught them to expect. She is the author of The Hormone Cure and Women, Food, and Hormones, among others, and writes on Substack at The Female Edge. She lives in Mill Valley, California.