When knees feel stiff in the morning or stairs become less comfortable than they once were, it is natural to wonder whether nutrition could help.
One unusual ingredient that frequently appears in traditional wellness discussions is the eggshell. Because eggshells contain a large amount of calcium, they are sometimes promoted as a simple way to “rebuild knee collagen” or restore worn cartilage.
That description goes too far. Eggshell calcium does not directly regenerate knee cartilage or activate collagen production. However, eggshells and especially the thin eggshell membrane have attracted scientific interest for very different reasons.
Understanding that distinction can help us appreciate this everyday ingredient without giving it abilities it has not been proven to possess.
Why Do Eggshells Attract So Much Attention?
An eggshell may look like kitchen waste, but chemically it is mostly calcium carbonate, along with much smaller quantities of other minerals and organic material.
Calcium isessential
