I’ve been taking ZMA every night for the past 5 or 6 days. Last night I woke up in the middle of the night with the worst cramps in my calf. They wouldn’t go away for anything.
Here is my thinking. I have heard that calcium before bedtime can help relieve leg cramps. Magnesium competes with calcium for absorption. Therefore, taking magnesium before bed may result in depleted calcium causing cramps.