I take a calcium/magnesium supplement to help treat muscle spasticity caused by my testosterone injections. I don't find it does much to my mood, personally.

Oddly enough, I started supplementing magnesium and chromium in my horse and have noticed that the combination has really helped him be able to relax more, so I am definitely a believer in its ability to help calm, I just don't feel it personally with my own supplementing.