I've been taking this supplement from Higher Nature.
http://www.highernature.co.uk/ShowProductFamily.aspx?ProductFamilyID=347The reason I got into it was because minerals help me with anxiety, mental clarity etc and I can't stand the gelcaps with fillers on a paleo diet - they make me feel sick. I notice a big difference when I take it in terms of mental state. Sure some would say placebo, but I'm convinced.
What are your opinions of taking it longer term? It could boost minerals and be a way of hedging my bets against low magnesium paleo diet etc.
It comes from sea water ultimately from the salt lake in Utah. So sea water is not a 'food' and may have dangers. At least it doesn't have a load of crap in it though.