Testosterone!

March is the month for auto-immune diseases. People who
suffer from such diseases often know a great deal about their own disease,
for example diabetes 1, multiple sclerosis, lupus, Hashimoto, etc. But looking at all of these
as a whole can give insights, as well . In particular the fascinating fact that almost 80% of sufferers
are women! And that the occurrence of such diseases is linked to a deficit of testosterone.
Not something one hears about very often...

http://www.futura-sciences.com/magazines/sante/infos/actu/d/medecine-maladie-auto-immunes-10/

http://cirrie.buffalo.edu/encyclopedia/fr/article/118/