I woke up this am noticing my ringing is improved. I've been taking magnesium for a few months and wondered if it could have anything to do with it. I came across this forum during my search for studies. I take much less than that given in the study. I've been waiting for another magnesium product to come in the mail with the plan to increase my intake so this gives me added incentive. I've been using several types of supplements, but the magnesium oil is my favorite and I've been using mostly that lately. I get Dr. Barbara Hendel's Mag. Oil, which is a Swanson's product, on Amazon. It's supposed to be the same thing as a more expensive brand. I usually spray it behind my knees, but just learned the torso is even More absorptive and I sprayed it there last night. It got rid of a leg cramp and really helps me sleep after decades of insomnia. You get 100 mg magnesium per seven sprays, apparently. i slept even More soundly last night from spraying it on my tummy and back. If it stings it will go away after a while, but putting aloe juice on first will prevent it. Dr. Carolyn Dean says the oil is best, but also recommends Natural Vitality cal-mag with a 1to 1 ratio of calcium to mag, which is what I'm waiting for in the mail. Google her for more info. I've also read that silica may hellp. I've just started taking that and I wonder if that could be helping. I take it for bone health, but it's good for other things. Unfortunately, I have to order it from the UK. It's LLRG-5 Organic Silica and I get it online from Plant Spirit. There are other brands, but this is the only one I personally trust for now. There is an interesting history behind it, which you could Google. I hope this helps someone. Oh, in regard to calcium causing heart attacks, it could be because we don't take enough magnesium, which helps calcium absorb into the bones rather than the tissues. See Dr. Carolyn Dean for more info.