[quote]daMOJO wrote:
Also, you should note that taking ZMA with calcium will diminish the effects of the ZMA.
That’s because Zinc and Calcium compete for absorption in your body.
So no multi-vitamins or dairy products within, say, an hour of taking ZMA.[/quote]
Yeah, or you could just quit believing everything some of these new-agey T-Nation people think and take your ZMA with a huge glass of milk.
Am J Clin Nutr. 1984 Dec;40(6):1213-8. Links
Effect of calcium and phosphorus on zinc metabolism in man.
- Spencer H,
- Kramer L,
- Norris C,
- Osis D.
Calcium and phosphorus have been shown to inhibit the availability of zinc for absorption in animal studies, but limited information is available on this subject in man. In the present study, the effect of both calcium and phosphorus on zinc metabolism was investigated in adult men by determining metabolic balances of zinc during three intake levels of calcium of 200, 800, and 2000 mg/day, and during two intake levels of phosphorus of 800 and 2000 mg/day. The analyzed dietary zinc intake was normal and was kept constant throughout all study phases. Increasing the calcium intake from 200 mg to two higher intake levels up to 2000 mg/day did not significantly change the urinary or fecal zinc excretions or the zinc balance. Also, increasing the phosphorus intake from 800 to a high intake of 2000 mg/day did not have any effect. The simultaneous use of the high calcium and high phosphorus intake also had no effect on zinc excretions and on the zinc balance.
J Nutr. 1982 Jan;112(1):136-43. Links
Effect of dietary calcium and phosphorus levels on the utilization of iron, copper, and zinc by adult males.
- Snedeker SM,
- Smith SA,
- Greger JL.
Iron, copper, and zinc utilization were examined in nine adult males fed a moderate calcium-moderate phosphorus diet (MCaMP), a moderate calcium-high phosphorus diet (MCaHP), and a high calcium-high phosphorus diet (HCaHP) during a 39-day balance study. The moderate and high calcium diets contained 780 mg and 2382 mg calcium daily, respectively. The moderate and high phosphorus diets contained 843 and 2442 mg phosphorus daily, respectively. The calcium supplements were fed as calcium gluconate, while the phosphorus supplements were fed as glycerol phosphate. Subjects lost more iron and copper in their feces and apparently retained less iron and copper when fed the HCaHP diet than when fed the other two diets, but these effects were not statistically significant. Urinary iron and copper excretion were significantly affected by the dietary treatments. Dietary treatments had no effect on subjects’ fecal and urinary losses of zinc nor on their apparent retention of zinc. Plasma iron, zinc, copper, and transferrin levels and serum ferritin levels were not affected by the dietary treatments.