By: Biocentric Health Research Staff

Testosterone Tumbling in American Males

A recent study published in the Journal of Clinical Endocrinology and Metabolism reported that testosterone levels among American males has fallen sharply the past two decades. Lead study author Dr. Thomas G. Travison, of the New England Research Institutes, stated that average total testosterone levels in men aged 65 to 69 fell 16% from 503 nanograms/decileter (ng/dL) in 1988 to 423 ng/dL in 2003.

"In 1988, men who were 50 years and older had higher serum testosterone concentrations than did comparable 50-year-old men in 1996." Testosterone is the primary male sex hormone and plays an important role in maintaining bone and muscle mass. Low testosterone levels have been linked to health problems, including lowered libido and diabetes.

It's normal for men's testosterone levels to peak in their late 20s and then start to gradually decline, experts say. But the New England Research Institutes study found that overall testosterone levels are lower than they were 20 years ago. The reasons for this trend are unclear. They noted that neither aging nor certain other health factors, such as smoking or obesity, can fully explain the decline.

One theory is that phytoestrogens and other common chemicals in the environment may be a factor in explaining declining testosterone levels among American males. A common source of these phytoesterogens and harmful chemicals comes from the dry cleaning process and also from the plastic bags used by cleaners.

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These statements have not been reviewed or evaluated by the U.S. Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease or illness.