When your knee loses collagen, eggshells are a lifesaver.
There’s a kernel of truth in that idea, but it’s overstated.
Eggshells are mostly calcium carbonate, and the thin membrane inside the shell contains small amounts of collagen, glucosamine, chondroitin, and other proteins. Some supplements made from Eggshell membrane have shown modest benefits for joint pain and stiffness in people with osteoarthritis.
What they don’t do is directly “replace” lost collagen in the knee. Your body digests collagen and proteins into amino acids first, then rebuilds tissues as needed. Joint health is influenced by many factors: age, weight, activity, inflammation, injuries, muscle strength, and overall nutrition.
If someone wants to support knee health, the evidence is generally stronger for:
- Regular strength training and mobility work
- Maintaining a healthy body weight
- Adequate protein intake
- Vitamin C (important for collagen synthesis)
- Managing inflammation and avoiding overuse injuries
- Physical therapy when pain persists
Some people do try:
- Bone broth
- Hydrolyzed collagen peptides
- Eggshell membrane supplements
Results tend to be mild rather than dramatic.
One important caution: eating raw crushed eggshells isn’t ideal because of contamination risk and sharp particles. If using eggshell-derived products, standardized supplements are safer than homemade powders.