The ZRT Laboratory Blog

The ZRT Blog is an extensive resource for patients and health care providers searching for health and hormone testing information. Here, you can read about ZRT’s cutting edge research, advances in testing, wellness advice, and health industry highlights.



L. Kroon, Editor

Mr. Kroon is the editor of The Official Website of John R. Lee, M.D. Right up to the moment of his death in 2003, Dr. Lee, dedicated his life to helping women and men overcome health issues related to hormone imbalances. His books have made millions aware that there are safe, natural alternatives to synthetic hormones and their dangerous side effects. The Official Website of John R. Lee, M.D. is dedicated to continuing Dr. Lee’s groundbreaking work. Its goal is to help both women and men achieve hormone balance and experience optimal health through safe, natural means. You can visit the website at www.JohnLeeMD.com.


Recent Posts

New Research Shows Natural Progesterone Can Help Treat Breast Cancer (Part 2)

Posted by L. Kroon, Editor on Friday, 11 December

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This article is republished courtesy of The Official Website of John R. Lee, M.D. If you missed part one of the article, read it here.

A Recipe for Beating (and Preventing) Breast Cancer

The latest research on natural progesterone and breast cancer clearly indicates how important it is for women to maintain healthy, normal levels of progesterone that are in proper balance with estrogen. Doing so could not only increase many womens’ chances of recovering from breast cancer – as the latest research indicates – but could also help them to avoid getting breast cancer in the first place.

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New Research Shows Natural Progesterone Can Help Treat Breast Cancer (Part 1)

Posted by L. Kroon, Editor on Tuesday, 01 December

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This article is republished courtesy of The Official Website of John R. Lee, M.D. This is part one. Part two of this article can be found here.

Two months ago, a large team of scientists working on multiple continents published a research study that came to startling conclusions about breast cancer and natural progesterone. The team determined that unlike synthetic progestins, which increase breast cancer risks, natural progesterone has the potential to slow the growth of many breast cancer tumors or even shrink them.

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