I can't find any reference in my notes to making it.

Re using it to make a lotion:
http://www.integratedhealth.com/hpdspec/magnesium-oil.html
An excellent body lotion may be made using 1/3 magnesium oil, 1/3 *organic coconut oil* <http://www.integratedhealth.com/hpdspec/coconut-oil.html>, and 1/3 organic aloe vera gel (whole leaf). Mix these in equal parts into a shaker bottle. Shake well. Apply liberally to skin whenever desired.

http://magnesiumforlife.com/transdermal-magnesium/combining-oral-with-transdermal/