Good question, but I don't know thw answer. I take a cal/mag/K supplement and have been doing it for years without questioning it. I think I've been more afraid of breaking my hip than heart disease. Dairy products are not exactly the best source of calcium. Magnesium has to be present for it ot be effective

There was a comment on it by Mrs. Yogi today. She takes it before bed, says it helps her sleep.

I've read that it helps prevent teeth grinding while sleeping if you take it before bed. There's also other reasons it's good to take, but I can't remember them!

Karen