Estrogen-Progesterone Balance and Cancer Promotion

submitted by: ZRT_Laboratory

Dr. David Zava, ZRT Laboratory President, talks about the balance of progesterone and estrogen, its importance to women's health, and risk of breast cancer.

Estrogen - The Angel of Life or The Angel of Death

submitted by: ZRT_Laboratory

Dr. David Zava, President of ZRT Laboratory, lectures on the importance of estrogen in women's health.