GlycoFlex Sport is recommended for adult or maturing dogs, and active dogs needing advanced joint support. GlycoFlex Sport contains a higher quantity of glucosamine, and the inclusion of MSM, manganese, DMG and perna canaliculus, GlycoFlex Sport is formulated to support a lifetime of health joints and joint comfort. Perna is a green-lipped mussel packed with nutrients and a key ingredient in GlycoFlex products. The perna mussel naturally contains glucosamine. chondroitin's 4&6, omega fatty acids and 21 essential fatty acids which makes perna truly a superfood. The perna used in GlycoFlex products is the GlycOmega brand perna canaliculus exclusive to VetriScience Laboratories. The nutrients provided from perna also are known to support other systems in the body including sperm motility, vascular system, bladder function, immune sustem function, and gut health.