I think it is kind of semantical to say ZMA doesn't boost testosterone, only keeps it from being depleted in athletes. If you're an athlete with depleted testosterone, then start taking ZMA, your average testosterone levels will increase.
Obviously they are completely different, but if you are zinc deficient you will see benefit from taking ZMA. If you aren't zinc deficient, you're better off just buying magnesium for dirt cheap from the drug store.
Magnesium and valerian root (which is in a lot of ZMA blends) are very relaxing. After I run out of ZMA, I'll be switching to taking only those as it is about half the cost of a ZMA stack.
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I've found ZMA actually puts me down and will keep me groggy as shit all day if I don't get at least 7 hours of sleep. I've had to be careful with it, because it will interrupt my training by sapping my energy levels and making me sleep through gym hours.
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I actually sort of got that feeling at first. Earlier in the day gym sessions after a night of sleep on ZMA would make me just perform worse. I didn't really notice any other side effects. It also went away after a few weeks of taking it.