Glucosamine Question

[mtnridr@pacbell.net]

Good morning!

My vet wants me to start giving my 18-year-old Arab mare a joint 
supplement. So now I've got all my catalogs out and I've been 
poring over the various products out there these days.  I found a 
supplement that is pure glucosamine--no Vitamin C, E, yucca, 
L-methionine, manganese, etc. (my vet recommended glucosamine 
only--not chondroitin sulfate). 
Question #1:  Is pure glucosamine with no additives an effective 
way to give joint supplements, or is there a synergestic thing 
going on that requires the additional vitamins?  She is already on 
Dynamite, and being fed oat/timothy/alfalfa hay and 
oats/corn/barley (dry). 
Question #2:  I am told that glucosamine sulfate is much more 
effective than glucosamine hydrochloride.  Any ideas?

Thanks!
Chris


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