The claim “When your knee loses collagen, eggshells are a lifesaver” is a popular social media health claim, but it is not supported by strong evidence that eggshells can rebuild lost knee cartilage or reverse arthritis.
Eggshells do contain minerals and a small amount of protein-related compounds, including calcium carbonate and components of the eggshell membrane (which contains collagen-like proteins). Some supplements made from eggshell membrane have been studied for joint symptoms, but the evidence is limited and does not show that eating homemade eggshell powder will regrow cartilage or cure knee pain.
What may actually support knee and joint health
- Adequate protein intake
- Provides amino acids your body uses to maintain muscles and connective tissues.
- Vitamin C–rich foods
- Vitamin C is needed for the body’s normal collagen production.
- Omega-3 sources
- Foods like fatty fish, walnuts, and flaxseed may support a healthy inflammatory balance.
- Strengthening exercises
- Building the muscles around the knee can reduce stress on the joint and improve function.
- Healthy body weight
- Reducing excess load on the knees can help many people with knee discomfort.
If you use eggshells as a supplement
Be careful:
- Raw eggshells may carry bacteria such as Salmonella if not properly cleaned and processed.
- Grinding and consuming homemade eggshell powder can pose safety and dosage concerns.
- People with certain kidney problems or calcium-related conditions should avoid extra calcium unless advised by a healthcare professional.
For ongoing knee pain, swelling, stiffness, or reduced mobility, it is better to identify the cause—such as osteoarthritis, injury, inflammation, or another condition—rather than relying on a single “miracle” ingredient.
