Flexivet start is the first step in the flexivet programme it should be used for 4 weeks before using flexivet go flexivet is a glucosamine food supplement providing nutrients essential for the maintenance of joints and production of healthy cartilage to maintain joint mobilityeach tablet contains glucosamine hydrochloride and chondroitin sulphate unlike other veterinary supplements the chondroitin sulphate is derived from a sustainable marine origin dogs cats weighing 5 15kg half of a