Have any of you used magnesium flakes in lotion making? My son (who plays college football) uses a spray of magnesium oil after every work out for muscle cramps etc. I soak in epsom salt baths all the time and was wondering if I could use magnesium in lotion for the same effect. My google search however did not turn up any official usage rates and I want to make sure and NOT use to much. Side effects are unpleasant (think milk of magnesia). I think this would also be helpful for people with restless leg syndrome......fishing for any info if you are willing to share. Thanks in advance!