It's said that magnesium is better absorbed through the skin. I take it both
ways, capsules of magnesium glycinate, and magnesium oil on skin. From the Weston Price site: "There are many advantages to transdermal magnesium therapy, since the gastrointestinal tract is avoided altogether and there is no laxative effect. Next to intravenous magnesium administration, transdermal therapy provides a greater amount of magnesium to be absorbed than even the best tolerated oral supplements, and can restore intracellular concentrations in a matter of weeks rather than the months required for oral supplementation."
I get magnesium oil from Health and Wisdom. They have a great intro pack with
free extras like magnesium prills to make Prill water. That first order has lasted me a long time.