I use a combo with glucosamine and chondroitin, I get it at CostCo, but you can get it anywhere vitamins are sold. Knox gelatin (jello) you buy at the supermarket. If it hurts, the best thing is rest, take a few days off jogging, ride a bike or something. Allow it to heal properly and come back strong.
I'm new here, but not to juice. Karma is good.