I Think Barbaro Should Be Put Down

[GenuineRisk]

Originally Posted by paisjpq

depends what part of the coutry you live in...certain areas like the Northeast and nrthwest have soil that is selenium deficient...and many people supplement (although they don't need to since local feed companies cater to the region and add it to their grain mixes)...other parts have adequate amounts in the soil, and there are places that actually have too much, areas of the southwest (New Mexico, Arizona) ...as selenium is toxic...

What does selenium do? (GR happily sits down at her school desk and prepares to learn something... )