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Adequate testosterone levels are vital for maintaining muscular growth, libido, and energy levels.
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Thus, supplement companies have toiled to produce elaborate concoctions aimed at elevating testosterone, and some have been scientifically proven to work. Interestingly, a study published in Biological Trace Element Research suggests that taking a daily calcium supplement may provide testosterone support in those who exercise to exhaustion.

Using a basic research design, 30 healthy males between the ages of 17-21 were randomly assigned to one of the following three groups: Group 1- 35 mg/kg/day calcium gluconate, without training; Group 2- 35 mg /kg/day of a calcium gluconate, exhaustive training 90 min/day, 5 days/week; and Group 3- exhaustive training 90 min/day, 5 days/week, without calcium supplementation. Although exercise is known to increase testosterone levels, the scientists reported that calcium supplementation provided increases in testosterone beyond that of exercise alone. Although calcium-induced increases in testosterone were modest, this evidence supports the use of daily calcium in athletes to (at least) maintain post-exercise testosterone levels.


Reference:
Cinar V, Baltaci AK, Mogulkoc R, Kilic M. Testosterone levels in athletes at rest and exhaustion: effects of calcium supplementation. Biol Trace Elem Res. 2009 Summer;129(1-3):65-9.