Are you looking for a way to get magnesium transdermally (through the skin) as opposed to orally?

I read mrsD's suggestion about trying the Morton epsom lotion but I didn't want anything creamy, so I opted for a magnesium oil spray. I chose Life-flo Pure Magnesium Oil from Amazon. It was reasonably priced and also reasonably pure.

I've been using it for over a week and it seems to be reducing my muscle spasms, so I'm pleased.