I had a major cartilage injury and suffered from lots of pain over the 3 months. Finally the doctors said that there is no longer chance for natural recovery and I will require surgery. However they only gave me 30% of chance that after surgery I will be more mobile or without the pain. I decided to try all what possible to rebuild the cartilage and get back on my legs. The ingredient in Tiens Advanced Formula Calcium are formulated in such way that they have all that is needed to rebuild the connective tissue and it worked for me so well! I have taken double dose for 1 month and normal dose for another 3 months, but the first improvements I could feel after 2 weeks. By the time my surgery's appoitment arrived I didn't need it!