Horses that have arthritis (joint damage and or navicular) have an increase in pain in the cold weather. For this reason it is important to supply them with a joint supplement to decrease the inflammation and pain. Stamina Plus has over 30 years of research with the Stamina Plus Equine Flex Plus. The ingredients of this product have stood the test of time in reducing inflammation and pain in cases of arthritis. Stamina Plus has 15 horses in long term studies on arthritis in the research facility in Cody, Wyoming. Besides the research horses we continue to have horses shipped to our research facility, from around the country, for evaluation of their lameness issues. These horses are then diagnosed as to the problem, treated and sent back to their owners.