<snort> as if Kathy. I remember reading it somewhere and have no clue where now. There's also magnesium that plays a role in there as well. That's why I said a bit of the layer feed as I know 'it's in there'. I used to have a chart as a cheat sheet, no idea what happened to it but it sure would be handy to have posted near this computer, lol. Selenium is another but I really hesitate to mention that one. That's a good one if your ground is low in it, but if it isn't it's easy to cause an overdose.