My parents-in law take this. They say this is quite effective. The major problem is this product is not available in HK. they have to ask the relatives in the US to get them a box whenever they come back to HK.
My mum and parents-in-law are taking Blackmores Glucosamine and it does work! However it's not available in HK. You may ask if any relatives/ friends who travel to Australia to get you this. It costs around AUD29 @ in Pharmacy when it's on sale.