07-05-2012, 09:14 AM
Join Date: Feb 2012
Bah, ZMA is useless too. People don't understand the context of most studies. Zinc is good for testosterone among many things, but excess zinc will not give you more results. Zinc is just involved in many processes that require you to get sufficient amount in order to be able to maintain normal bodily processes. People deficient in zinc don't maintain these processes. You can avoid wasting your money by eating a healthy diet. The only reason North Americans lack zinc is because of the unhealthy fast food diets many of them lead. Even beef has plenty of zinc but fast food places do not use real sources of beef but highly processed meat sources.
Supplement companies use these studies out of context to sell their stuff.
Show me a study that shows increase in testosterone for men who already get enough zinc and add extra through supplementation.
The studies done were on deficiency, as this one shows.
Zinc status and serum testosterone levels of healthy adults.
Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ.
Department of Internal Medicine, Wayne State University School of Medicine, Detroit, Michigan, USA.
Zinc deficiency is prevalent throughout the world, including the USA. Severe and moderate deficiency of zinc is associated with hypogonadism in men. However, the effect of marginal zinc deficiency on serum testosterone concentration is not known. We studied the relationship between cellular zinc concentrations and serum testosterone cross-sectionally in 40 normal men, 20 to 80 y of age. In four normal young men (27.5 +/- 0.5 y), we measured serum testosterone before and during marginal zinc deficiency induced by restricting dietary zinc intake. We also measured serum testosterone in nine elderly men (64 +/- 9 y) who were marginally zinc deficient before and after 3 to 6 mo of supplementation with 459 mumol/ d oral zinc administered as zinc gluconate. Serum testosterone concentrations were significantly correlated with cellular zinc concentrations in the cross-sectional study (lymphocyte zinc versus serum testosterone, r = 0.43, p = 0.006; granulocyte zinc versus serum testosterone, r = 0.30, p = 0.03). Dietary zinc restriction in normal young men was associated with a significant decrease in serum testosterone concentrations after 20 weeks of zinc restriction (baseline versus post-zinc restriction mean +/- SD, 39.9 +/- 7.1 versus 10.6 +/- 3.6 nmol/L, respectively; p = 0.005). Zinc supplementation of marginally zinc-deficient normal elderly men for six months resulted in an increase in serum testosterone from 8.3 +/- 6.3 to 16.0 +/- 4.4 nmol/L (p = 0.02). We conclude that zinc may play an important role in modulating serum testosterone levels in normal men.
If you feel you do not get enough zinc, fine, but man people will do anything to avoid healthy diets.
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