You could get a plain zinc supplement for quite a bit cheaper. Their is some evidence for its use and it's not doping.

http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
Both resting and exhaustion total and free testosterone levels following 4-week zinc supplementation were found significantly higher than the levels (both resting and exhaustion) measured before zinc supplementation (p<0.05). CONCLUSION: Findings of our study demonstrate that exhaustion exercise led to a significant inhibition of both thyroid hormones and testosterone concentrations, but that 4-week zinc supplementation prevented this inhibition

http://www.ncbi.nlm.nih.gov/sites/en...ubmed_RVDocSum
t the end of the supplementation period, the parameters of the subjects in groups 1 and 3 were significantly higher than those of group 2, both before (p<0.005) and after (p<0.05) exercise. These results suggest that zinc supplementation has a positive effect on hematological parameters in athletes.