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Koehler K, Parr MK, Geyer H, Mester J, Schänzer W.
1Institute of Biochemistry, German Research Centre of Elite Sport, German Sport University Cologne, Cologne, Germany.
Objectives:To investigate whether the administration of the zinc-containing nutritional supplement ZMA causes an increase of serum testosterone levels, which is an often claimed effect in advertising for such products; to monitor the urinary excretion of testosterone and selected steroid hormone metabolites to detect potential changes in the excretion patterns of ZMA users.Subjects:Fourteen healthy, regularly exercising men aged 22-33 years with a baseline zinc intake between 11.9 and 23.2 mg day(-1) prior to the study.Results:Supplementation of ZMA significantly increased serum zinc (P=0.031) and urinary zinc excretion (P=0.035). Urinary pH (P=0.011) and urine flow (P=0.045) were also elevated in the subjects using ZMA. No significant changes in serum total and serum free testosterone were observed in response to ZMA use. Also, the urinary excretion pattern of testosterone metabolites was not significantly altered in ZMA users.Conclusions:The present data suggest that the use of ZMA has no significant effects regarding serum testosterone levels and the metabolism of testosterone in subjects who consume a zinc-sufficient diet.European Journal of Clinical Nutrition advance online publication, 19 September 2007; doi:10.1038/sj.ejcn.1602899.
PMID: 17882141 [PubMed - as supplied by publisher]
i have a question about zma.... i always hear about that you not supposed to take with any kind of a dairy product, mine even says that on the label. how important is that, because im sure most everybody taking it would have somekind of a casein supplement also before bed. How are you supposed to avoid mixing them.
I thihk ZMA is very good supplement!
Be very careful when taking it, as it seems to be inhibited by calcium sources(take at least 2h appart, best on empty stomach).
Also, be sure not to take just ANY ZMA! Not all are the same(some companies put calcium in their tabs as a "bond material" out of ignorance but convinience as well). So if not working, don't diss the supp just like that, try with various companies.
Victor Conte, owner of Balco Labs(company who patented ZMA) sells a genuine zma. That should be fine. I had a phone nr somewhere from where it could be ordered. If you're interested, i could look it up.