MVP K9 DOUBLE STRENGTH FLEX K-9 JOINT FORMULA (90 COUNT TABLETS) Formula Flex K9 Joint Supplement is formulated to support hip, joint, and connective tissue functions in Formula Flex K9 Joint Supplement contains 5 active ingredients to combat against joint issues. Chondroitin, Glucosamine, Methylsulfonylmethane (MSM) , Vitamin C, Manganese