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Arthritis or another medical condition could be the cause of a stiff knee. Overuse of the joints and muscles in your knee can also cause stiffness. Strengthening your hamstrings, quadriceps and other knee-supporting muscles protects your knees from stress and the shock of impact, according to American Academy of Orthopaedic Surgeons. Stretching your muscles improves flexibility, which can prevent stiffness and injury.
Calcium is helpful in reducing joint pain and inflammation and is one of the best supplements for knee joints. 8) Vitamin C: Vitamin C is an anti-oxidizing agent that helps protect connective tissues like the ligaments, tendons, and skin, not to mention the bones and joints. Vitamin C helps make collagen which is important for the flexibility of muscles and blood vessels.