My chiropractor suggested I take magnesium and zinc for the following: Magnesium: for stiff muscles, heart palpitations. Zinc: because I have a low sex drive Please Register or Log in to view the hidden image! He said to take them both on an empty stomach. I do fine with the magnesium on an empty stomach, but the zinc makes me vomit. How long before I can expect results? How long should I go before and after taking the magnesium to eat? Is it useless to take the zinc if I have to take it with food?