I take 1/2 teaspoon magnesium citrate mixed in about a quarter glass of warm water daily. It's a product called
Calm and I use it in a powder form, unflavored. Doesn't taste bad at all. I take it each evening before going to bed. For me, it reduces ectopic heartbeats (PACs and PVCs). I do not experience any digestive issues or other noticeable side effects from the Calm product.