This is the study that got everyone interested in melatonin. You can't buy it in the uk, so I haven't been able to try it.
There was also an interesting study on zinc salts http://www.nature.com/ajg/journal/v106/n1/abs/ajg2010327a.html
But it is not in a form that you can buy on the high street. Sadly you get the feeling that the research is about finding a marketable product rather than telling us how to get better by DIY methods.
I'm not sure there's anything concrete about calcium citrate. Calcium is responsible for muscle contraction, whereas magnesium does the opposite. Whatever article I read gave me the impression the calcium citrate would have an immediate effect, but it didn't make me feel any different. I'll see if I can find the article . . . .
New stuff: GERD. Interstitial Cystitis
Lifelong stuff: Food allergies, eczema, asthma