Multi-Flex Gold for horses, ponies and donkeys is formulated to maintain and support: flexible joints and muscles a healthy circulatory system those prone to laminitis optimal mobility whatever the age Multi-Flex Gold is a fast-absorbing liquid supplement containing herbs such as devil’s claw root and nettle. It’s dry equivalent, Multi-Flex, was the first supplement formulated by medical herbalist/co-director Hilary Self, and together they are some of our best-selling herbal supplements for horses and ponies. After initial use, you can move on to dry Multi-Flex (we do not suggest administering both together).