Milk bloats me up like a balloon. As for calcium interfering with ZMA, I think thats more bro-science than actual fact.
Nope, not broscience.
Here's an excerpt from the knowledgable Big Cat regarding the issue:
the deal with calcium is that is has the same transport mechanism as zinc and copper. This mechanism is limited and when more than one of these substances is absorbed one is prioritized over the other. With calcium being the third most important mineral in the body its given high priority over zinc and copper, and likewise zinc is prioritized over copper.
Even if you take high doses of zinc over your calcium, you'd need to get 30 mg more zinc than calcium to get the 30 mg absorption. Now the question is, how effective is the transport mechanism. If you take 50 mg of Ca and 80 mg of Zn (I don't recommend anyone take more than 50 mg at any time however) and the transport can only handle 50 mg, then it will take mostly calcium and there is no way you'll get anywhere near 30 mg in.
The proper way to do it, is to take it on an empty stomach with no calcium present. An empty stomach because that assures no digestive interference and a maximum transport capability since none of these minerals recently passed through. Also its advised to take it before bed because that is when Zn is most effective at improving sleep and boosting LH output. Now a lot of people want to prevent catabolism by having a slow digesting protein shake before bed, because cortisol increases overnight and peaks in the morning. Of course shakes have calcium. The best way to resolve that is to take the ZMA on an empty stomach (60 miutes or longer after last meal depending on what you ate) , but 30 minutes BEFORE you take your shake right before bed. That gives the zinc plenty of time to be absorbed before the calcium hits the stomach without having to lose too much time.
The other way around ruins the effect. Taking the slow-digesting shake first you need to wait up to 2 hours before taking ZMA which knocks nearly 160 minutes off the efficacy of your shake.