I know people have questioned the benefits of the ZMA formula, and whether or not it does raise testosterone. Here is a recent study on magnesium used alone. Notice the dosage. With my clients I try to hit 6-10 mgs per kilogram, so relying on a ZMA formula for all your magnesium needs wouldnt be optimal.
Biol Trace Elem Res. 2010 Mar 30. [Epub ahead of print]
Effects of Magnesium Supplementation on Testosterone Levels of Athletes and Sedentary Subjects at Rest and after Exhaustion.
Cinar V, Polat Y, Baltaci AK, Mogulkoc R.
Karaman High Medicine of Physical Education and Sports, Selcuk University, Karaman, Turkey, firstname.lastname@example.org.
This study was performed to assess how 4 weeks of magnesium supplementation and exercise affect the free and total plasma testosterone levels of sportsmen practicing tae kwon do and sedentary controls at rest and after exhaustion. The testosterone levels were determined at four different periods: resting before supplementation, exhaustion before supplementation, resting after supplementation, and exhaustion after supplementation in three study groups, which are as follows: Group 1-sedentary controls supplemented with 10 mg magnesium per kilogram body weight. Group 2-tae kwon do athletes practicing 90-120 min/day supplemented with 10 mg magnesium per kilogram body weight. Group 3-tae kwon do athletes practicing 90-120 min/day receiving no magnesium supplements. The free plasma testosterone levels increased at exhaustion before and after supplementation compared to resting levels. Exercise also increased testosterone levels relative to sedentary subjects. Similar increases were observed for total testosterone. Our results show that supplementation with magnesium increases free and total testosterone values in sedentary and in athletes. The increases are higher in those who exercise than in sedentary individuals.