I am considering giving our dogs a supplement called Flex-Agility Max. Its main ingredient is Bromelain - which I know is safe. but, it also contains vitamin C (I know thats safe), Japanese Sohora flower, European Elder Berry Extrac, Green Tea (decaffinated) and something called N-Acetylcysteine. Oh - and a blend of hops, ginger ryizome extract and Boswellia. The sales person said that it was safe for dogs, but I want to make sure before giving it to them.