Professional Strength Cosequin ASU Joint Supplement. Cosequin ASU goes above and beyond the traditional glucosamine/chondroitin sulfate products on the market. Cosequin ASU contains NMX1000™ avocado/soybean unsaponifiables (ASU) formulated with FCHG49® glucosamine hydrochloride and TRH122® low molecular weight chondroitin sulfate. Plus the addition of high purity MSM! This sets Cosequin ASU apart from any other joint health supplement for horses. And all in a tasty, easy to administer powder!