I ordered the 3000 MG first, and it worked to take away the pain in my shoulder and lower back quickly. I had my husband use it on his knees, because they ache at night, causing him pain and no sleep. He really didn't think it worked that great, so I ordered the 6000 MG black bottle, and what a game changer! My husband is pain free, sleeping at night, and telling others how great it works too!