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Fight Depression by Raising Free Testosterone
Testosterone’s effects can be felt above the belt, too. A 2008 Archives of General Psychiatry study found that older men with the lowest levels of free testosterone were at a higher risk for depression than men with the highest levels. Researchers haven’t pinpointed the link, but other studies have shown [...]

“Bioavailable testosterone refers to the ‘free’ testosterone of the hormone unbound to carrier proteins which is able to act directly upon target tissues.”
You can not maintain or build muscle mass without having free, unbound testosterone in your body.