DHEA is a natural hormone precursor to testosterone. As you age, your body produces less and less DHEA. Supplemental DHEA can often help bring testosterone into the normal range. A typical dosage for men is 25-50 mg per day. Try Lindberg DHEA 50 mg.
ZMA combines special forms of zinc and magnesium aspartate with vitamin B-6. Two studies show it can raise total and free testosterone up to 33% in athletes. Many bodybuilders feel that ZMA improves recovery from strenuous training sessions. ZMA is usually taken at bedtime and many users report that it helps them sleep better. Fitness Labs ZMA is our best seller. ISS Research ZMA or Twinlab ZMA Fuel are other good choices.