I have been using natural hormones since I was 48 years old...I'm now 76. My blood work is always excellent, as well as my health. I take no pharmaceutical drugs, I only take natural thyroid and natural hormones. When I have been asked why I look so young, I say: I eat healthily and exercise, but the number one thing is I take natural hormones. When I see all the drugs advertised on TV with all their dreadful side effects, why would I want to take unnatural pharmaceutical hormones?