Boron helps certain types of arthritic joint pain. I take 3mg once or twice a day in pill form, along with Magnesium 400mg / D3 at 5,000 IU / and some Calcium (as I don't eat dairy). I know that taking CA is under dispute by some - but I find that I get muscle aches when I don't take it for a few days, so I must need it to some degree. I try to take less CA than I do MG however.
Boron is the key to relieving joint pain though - It is nothing short of amazing.
Google "Boron and Arthritis" to read about it. Lots of info here on EC too.