Absolutely cannot recommend this "medication." Took 500mg dose for 7 days and suffered: inflamation of the Achilles; muscle spasms in legs; cramps in in the thighs and the glutes; stiffness in leg joints; shoulder and neck pain; and then acne-like breakouts on the forehead and body-wide itching. Of course these were all noted side effects. I stopped taking the meds, looked into homeopathy remedies and cleared up the problem myself. Continued to have stiffness in the legs for several weeks but found glucosamine and chondroitin helped quite a bit. I'm sure this works for some people...but not me.