If the joint pain if a strained tendon, I like Magnesium (citrate, malate or glycinate). Magnesium makes tendons more flexible.
Enzymes like bromelain and serrapeptase are good too.
DMSO is a sulfur compound that has powerful antioxidant effects and kills pain. This gets rubbed right on the joint.
Anything needed for collagen production will be beneficial: zinc, copper, silicon, sulfur, manganese, vitamin C, oligomeric proanthocyanidins (grape seed extract, pinebark extract, bilberry), Arginine, Glycine