(Manna Pro) Rapid Flex Complete Joint Supplement for Horses is clinically proven to improve range of motion and weight bearing in as little as 15 days. Rapid Flex Contains a patented combination of joint-building agents and herbs for joint health and flexibility. Each 2 oz. scoop of Rapid Flex contains 5000 mg glucosamine HCl, 1025 mg mucopolysaccharides, plus yucca, devil's claw and more. Loading dose: 2 scoops per day for 3 weeks, then 1 scoop per day for maintenance. Not recommended for pregnant or lactating mares.