A meta-analysis of 10 randomized controlled trials of glucosamine and chondroitin alone or in combination and placebo has found these products give no benefit over the placebo for the relief of hip or knee pain. Six of these trials also found they had no effect on joint-space narrowing.
PositiveTip: While apparently safe, strong evidence suggests taking glucosamine and chondroitin supplements is a waste of hard earned money.