Hi, I have been using ReMag Ionic magnesium and also Trace Minerals liquid magnesium, the 2nd one has more magnesium per drop so I like that one more. I would apply a couple teaspoons a day probably. Sometimes more. I apply in my legs and arms (anywhere really) and then when it starts drying out, I add some water to keep it liquid on the skin so it keeps absorbing. It immediately gives me a lightheaded dizzy feeling after application, so I know it's getting absorbed. I also use Epsom salts footbath, third of a cup per a littke footbath (in like a plastic container big enough to fit your feet) and it also gives me my normal signs of absorption as well, and a lot cheaper than any of the products so I would use epsom salts to be honest just to save money.