Been giving my 19 year old arthritic mare Fluid-Flex for years but it cannot be shipped to Canada anymore so looking for a new one. Might also be using it for my 10 year old jumper who recently injured her knee pretty bad (if she develops arthritis). I’ve heard great things about Certa-Flex. Does anyone use it? Or can you recommend something else? (Canadian stores only please, shipping from the US costs a ton!)