Quote Originally Posted by Aggie
It's the same thing. Check it out! Selnium is one of the trace mineral we do not get enough of.
Yes, it's the same selenium.

However, check the labeling on a supplement that contains it -- the Recommended Daily Allowance for selenium (for adults, presumably based on something like 70 kg body mass) is 67 micrograms. As little as two or three times the RDA can be significantly toxic. And 67 micrograms of elemental selenium is a speck that would be almost invisible to the naked eye in a good light (even if your eyes are younger than mine and still accommodate for close vision easily).

In the Northwestern USA, Washington state, there's a wildflower called "Camas" that native Americans used as a winter food stock -- the root stores starch, similar to a potato (only much smaller). Problem is, the very same species is poisonous in some locations, and not in others -- the natives knew which meadows had which kind, but the white settlers didn't, and occasionally ate some of the "Death Camas" by mistake (the flowers, white on the safe plants and purple on the deadly ones, aren't visible in winter when the roots are dug for food). The difference? The purple ones are colored by selenium they've concentrated from the soil where it's available...