I had great luck with purity products' HA formula. without question the health of my knees improved more than i could imagine (i'm an old skier and runner). but their sales tactics are BEYOND absurd. these people are the worst spammers and callers the world has ever known. really, they are horrible and they never stop. even after i got them on my 'do not call' list, THEY CALLED ME with a different company name. i got, 'this is heather at joint health where we specialize in purity products, wanna buy some... read full review »