There is a great deal of medical research on Hormone Replacement.
I’m suggesting several good books that you can pick up at the bookstore.
Dr. R. LeConey

Stopping the Clock, author Dr. Ronald Klatz
Grow young with HGH, author: Dr. Ronald Klatz
Brain Fitness, author: Dr. Ronald Goldman
The Anti-Aging Zone, author: Dr. Barry Sears
The Testosterone Syndrome, author: Dr.Eugene Shippen
The Sexy Years, author: Suzanne Somers
Natural Hormone Balance for Women, author: Dr. Uzzi Reiss