Elemental Selenium is toxic to plants and animals in large amounts both convert it to at least Selenomethionine via the methylation cycle (in humans no idea what plants do).

If you do get Selenium from plants (they must be grown in Se rich soil first) it is always in at least the Selenomethionine format. Some like Garlic and Broccoli can take that a step further and create SeMC which goes directly to our cells for cancer fighting, but the same caveat applies…Se in soil first.

Selenium from yeast is just a bunch of elemental Se dumped in a bin with some yeast and the yeast converts it to Selenomethionine for us. The exact ratio of what you buy is unknown but we can most likely say we would get at least a 60:40 Selenomethionine/elemental Selenium mix or better.

But any ingested in elemental form must be converted by our bodies, for some the methylation cycle is already broken for others it’s stretched so taking large doses of elemental selenium is detrimental.
Methionine is so precious that when our bodies break down dead cells they save it inside Homocysteine, a toxic amino acid, so it can be later extracted and recycled.
Good explanation here:
http://aor.ca/int/related_research/homocysteine+.php


In short if you are going to go above RDA Toxic doses of 400mcg you better make sure you use Selenomethionine, one of those is
http://www.iherb.com/ProductDetails.aspx?c=1&pid=818


Some of that is in the FAQ under Selenium, other great posts:
More than you ever wanted to know about Selenium

http://curezone.com/forums/fm.asp?i=918481#i


Methionine rant

http://curezone.com/forums/fm.asp?i=954098#i


Selenium is a lot like a lion tamer in the circus -- it's a virus tamer...

http://curezone.com/forums/fm.asp?i=907466#i


Everything you ever wanted to know about selenium

http://curezone.com/forums/fm.asp?i=838253#i

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