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Acti-Flex 4000 improves performance of all joints, repairing and preventing damage. Works with remarkable speed, making noticeable improvement within 5 days. In fact, results may be seen in as little as 48 hours. Key substances in Acti-Flex 4000 work together to improve performance by increasing the horse's supply of joint-lubricating synovial fluid, which repairs and strengthens body parts that running puts under high stress.