Any item not occuring in the natural feed of the the horse, ie: hay, grain, salts, is
considered an "illegal" supplement. Using these "supplements" such as MSM, DMG, Flex Free,
Biotin, etc, etc could be cause for disqualification from a ride.
DMSO is one item I know of that has caused a rider to be disqualified. Cooling gels for legs
are another item that has been discussed as "illegal".
Be careful using any supplement if you are seriously competing! One thing in the horses favor
is that many of these supplements do not test positive on current drug tests.
Ray Santana
UC Davis Medical Center
Network Operations
rtsantana@ucdavis.edu