So let’s begin with the basics: what exactly are eggshells? Surprisingly, they are one of the most affordable and efficient natural sources of calcium you can find.
Eggshells are made up of about 95% calcium carbonate, along with trace amounts of magnesium, potassium, zinc, and iron. These are the same minerals your body uses to build and maintain strong bones, teeth, and nails. Structurally, eggshells have three protective layers: a tough outer shell formed by calcium crystals and two inner membranes rich in keratin proteins that help protect against bacteria.
Although many people get enough calcium through regular meals, a large number struggle due to limited food access or restrictive diets. For these individuals, eggshells can offer a low-cost, sustainable calcium alternative.
The good news is that there’s no need to buy expensive eggshell powder from the store—making it at home is incredibly easy.
That said, eggshells are not a cure or a direct prevention for diseases. However, when prepared and used properly, they can support overall health in several indirect ways.
Supports Bone Strength
Eggshells provide a simple, budget-friendly way to help maintain healthy bones. Because they are almost entirely calcium carbonate, they serve as a natural substitute for commercial calcium supplements. Research published in the International Journal of Food Science and Nutrition suggests that powdered chicken eggshells can be an effective calcium source right from your kitchen. Some studies even show that calcium from eggshells may be absorbed better than synthetic supplements.
Helps Lower Osteoporosis Risk
While aging is unavoidable, maintaining adequate calcium intake can slow bone loss and help preserve bone density. Studies have shown that people who consumed eggshell membrane powder experienced improvements in bone density, indicating its potential role in reducing osteoporosis-related bone weakening.
Promotes Collagen Production
The thin membrane inside eggshells contains collagen, a protein essential for skin elasticity and joint flexibility. As we age, collagen production naturally decreases, contributing to wrinkles and joint stiffness. Research suggests that extracts from eggshell membranes can help boost the body’s collagen levels.