What is a good supplement for joints(knees)!!!?

I have been cycling for quite some time now my joints especially my knees is starting to hurt,just need a good supplement to keep my joints in good condition,if it doesn't work i will consult a gp!!!
Best answer:
Hey there, I've suffered from that one myself, big time, I pity you. There's this great juice out though that people are using for that problem now, it's so effective it's even been in the news. You can check it out at these two places:
http://www.mangosteenhealth101.com...
http://youtube.com/watch?v=vcnp6z12hu4...

It could help you out

Good luck
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