Question on MSM/Sulfur

["Tamara Woodcock" <plasmatica@hotmail.com>]

Question o the necessity of sulfur inthe diet:

According to the cute little program that came with the NRC 1989 nutrition 
book, my horses all need sulfur.  Around 10 grams each

My horses are on "city water", nice and filtered <g>.  I have no pasture, my 
horses are effectively on dry lots with free choice hay.  I had the hay 
tested once, but sulfur never showed up on the report.  Sulfur also doesn't 
show up in the feed according to the feed mill's nutritionist.

So at what dose does MSM cease being a normal supplement and become a 
"drug"?  If MSM in any amount is considered a "drug", what other source of 
bio-available sulfur is there?

-Tamara

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