VetriScience Laboratories GlycoFlex Plus, Hip and Joint Supplement for Dogs GlycoFlex Plus delivers effective joint supporting nutrients in a delicious duck flavored soft chew. GlycoFlex Plus is clinically proven to alleviate joint discomfort and mobility issues due to normal activity in dogs of all ages GlycoFlex Plus Joint Supplement for Dogs provides effective joint support for working, competitive and senior dogs. Our formula is clinically proven to increase hind leg strength up to 41% in just four weeks*. Active Ingredients in GlycoFlex Plus include glucosamine, chondroitin, Perna caniliculous, MSM and DMG VetriScience products are manufactured in the U.S.A. and are backed by a 100% Satisfaction Guarantee.