Ask the Doctor: Are Covid Vaccines Risky for Men Receiving Hormone Injections?

Question for Dr. Rona:

If a man in his early to mid 60’s takes a testosterone shot once a month, is it dangerous to take the Covid shot and booster shots as well?  I have tried to find out but get conflicting answers from different sources. Thank you so much, Louise D.

Dear Louise:

The issue of an interaction between the Covid-19 vaccines and testosterone injections has not been fully studied. What is known, however, is that testosterone injections can cause polycythemia (high red cell counts) in about 20% of men receiving the hormone injections. This increases the risk of abnormal or excessive blood clotting leading to strokes, heart attacks, deep vein thrombosis and possible pulmonary embolus. This occurs because testosterone can stimulate the production of erythropoietin (EPO), a hormone made by the kidneys that stimulates the production of red blood cells.

Both Covid-19 infections as well as the Covid-19 vaccines have been reported to cause elevations in the protein known as fibrin-D-dimer which increases the likelihood of the same abnormal clotting phenomenon. This has been reported to be rare.

Theoretically then, testosterone shots, Covid-19 infections, and the Covid-19 vaccines could be associated with an increased blood clotting risk. Although there is no evidence of a direct interaction between testosterone and the vaccines, the risk of abnormal blood clotting phenomena – rare as that might be – is there.

Periodic testing of the complete blood count (CBC) and testosterone levels could be done to rule out the polycythemia side effect and the dose of the injections modified based on the lab results. Similarly, abnormal blood clotting can be determined by laboratory testing if symptoms such as leg pain and breathing difficulties occur. Hopefully this answers your question.


Zoltan P. Rona, M.D., M.Sc.


Dr. Zoltan P. Rona is a graduate of McGill University Medical School (1977) and has a Masters Degree in Biochemistry and Clinical Nutrition from the University of Bridgeport in Connecticut (1984). He is the author of 11 books on natural medicine – three of which are Canadian bestsellers, The Joy of Health (1991), Return to the Joy of Health (1995), and Childhood Illness and The Allergy Connection (1997). He is co-author with Jeanne Marie Martin of The Complete Candida Yeast Guidebook (1996) and is medical editor of the Benjamin Franklin Award-winning Encyclopedia of Natural Healing (1998). He has had a private medical practice in Toronto for the past 42 years, has appeared on radio and TV as well as lectured extensively in Canada and the U.S. Visit his website for appointments, call (905) 764-8700; Office: 390 Steeles Ave. W. Unit 19, Thornhill, ON

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