If your knees crack, hurt when climbing stairs, or feel stiff after sitting for a while, you’re not alone. These symptoms become more common with age and may be related to normal wear and tear, muscle weakness, or conditions such as osteoarthritis. Social media often claims that eggshell powder can rebuild knee collagen, but the truth is more nuanced.
Important: There is no strong scientific evidence that eating eggshell powder can restore knee cartilage or rebuild collagen. However, eggshells are a natural source of calcium, and a specialized ingredient called eggshell membrane has shown some promise in research for mild joint discomfort.
Why Do Knees Crack?
Occasional knee cracking without pain is usually harmless and may occur because:
- Tiny gas bubbles pop inside the joint fluid.
- Tendons or ligaments move over bone.
- Natural joint movement creates harmless sounds.
However, cracking with pain, swelling, or instability should be evaluated by a healthcare professional.
Common Causes of Knee Pain
Knee discomfort may be caused by:
- Osteoarthritis
- Muscle weakness
- Previous injuries
- Overuse
- Tendinitis
- Excess body weight
Proper diagnosis is important because treatment depends on the underlying cause.
Can Eggshells Help?
Eggshells are mostly made of calcium carbonate, which can help meet calcium needs if processed safely and appropriately. The thin eggshell membrane contains collagen, glucosamine, chondroitin, and other proteins.
Some studies suggest eggshell membrane supplements may modestly reduce joint pain and stiffness in people with osteoarthritis. However:
- Research has focused on commercially prepared eggshell membrane supplements, not homemade eggshell powder.
- Homemade eggshell powder has not been proven to rebuild cartilage or cure arthritis.