That said, some research suggests collagen peptides may modestly help pain and function in certain people when taken consistently for weeks or months. A 2017 study published in the American Journal of Clinical Nutrition found that vitamin C-enriched gelatin taken before exercise increased markers related to collagen synthesis. That is interesting, but it does not mean the knee is healed immediately.
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Plain gelatin is digested into amino acids, which your body uses where needed. It does not travel straight to the knee and rebuild tissue on command. Still, when paired with movement, it may support the body’s natural repair processes better than taking it alone.
Common forms people ask about
Option What research suggests Typical timeline
Hydrolyzed collagen peptides May modestly improve pain and function in some people Weeks to months
Undenatured type II collagen May help some people by affecting immune response in the joint Gradual
