The base is the same as the muscle gel which is why we go to maximum hold of 12% active ingredients.
Manganum carbonicum in a homeopathic remedy form is key for the knee structure at 4% of homeopathic active ingredients. Rita is #% and helps mainly with cartilage and tendons. Baryta carbonicum is when the knee feels so weak one would literally prefer to walk on the knee as it feels the knee cannot support the body. Rhus toxicodendron as in the muscle gel comes into play in cases of stiffness of knee. Finally cascara fluoride helps when the cartilages are worn out and cause bone pain.
Pierre Fontaine developed this knee gel after having a knee problem himself. He worked on many different formula until this one gave him instant relief and thanks to this gel he was able to run long distances again.