you can find them at most health food stores. look at the liquid trace mineral products, then carefully read the bottle to see the source. they are usually sourced from the sea, the great salt lake, sometimes the dead sea, or from humic shale which are ancient plant deposits that are highly concentrated in minerals. i have used and recoomended Concentrace brand minerals in the past, and it comes from the salt lake. but recenlty i have learned from moreless that plant derived minerals are best. here is a site that sells humic shale derived minerals, i have never actually used this brand but it looks okay.