I've had problems with the knee of my left leg ever since i was young although it doesn't actually cause pain or anything everytime i bend it and extend something cracks/crackles. Also when my knee bends too much from pulling my leg back something pops a little. I've been more cautious lately and i was wondering if supplements could help strengthen my joints? I'm not really sure what i should do and surgery really isn't what i'm looking at, no point unless i actually feel pain which never has happened.