I love experiments like that smile emoticon They're on me,
  they're safe enough, and I *know* if they work because.. it's
  me. [even if it's placebo, I don't care. Placebo is powerful
  stuff too]. But I throw as much Science as I can at the question
  so that I feel confident if nothing else smile emoticon It led
  me to a new habit as well: occasional zinc and magnesium
  together. I got reasons I could ramble about but it's related to
  anxiety, immune system, creative-thinking combined with memory
  retention (one of my obsessions) and stuff like that. Oh, heart
  health too. We get calcium (and now VitD) shoved into us by
  media promotions but where's the relaxer? Calcium tenses,
  magnesium relaxes (well, "opens" or "releases"). You get your
  mag from the chloryphill in green veggies but I don't always eat
  as much greens as I want (even though I love salad). So if I
  feel my veg intake is low, I take some magnesium.