FlexAbility is suitable for working horses to help maintain normal joint function and to protect against the rigors of exercise training. In addition, older animals, especially those prone to being stiff, may benefit from FlexAbility, where cumulative wear and tear is starting to take their toll. WHAT'S DIFFERENT ABOUT FLEXABILITY? For horses with existing problems, if you don't see a response in two weeks then we don't recommend you buy another tub! Our clinical trials suggest for stiff horses, 6-7 out of 10 treated will show a positive response within 14 days on the loading dose. Formulated for maximum effect with superior levels of active ingredients and scientifically evaluated.