According to this article at http://www.lef.org/magazine/mag2008/dec2008_Harvard-Experts-Recommend-Testosterone-Replacement_02.htm
"Testosterone for Life defines low testosterone as free testosterone blood levels below 15 pg/mL. We at Life Extension suggest that aging men maintain their free testosterone at a level of 20-25 pg/mL to more closely resemble that of a healthy 21-year-old."
Sunday, December 4, 2011
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