Many people who include eggs in their diet for their health benefits usually toss the shells straight into the trash. Why? Simply because most people don’t realize that eggshells themselves have valuable benefits.

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.

Strengthens Teeth

Calcium is just as important for teeth as it is for bones. Finely ground eggshell powder can help strengthen tooth enamel and reduce sensitivity. In fact, some natural toothpaste brands use eggshell powder for its remineralizing properties. With regular use, it may help protect against tooth decay and support oral health.

While eggshells offer several benefits, there are important precautions to keep in mind.

Never swallow large pieces of eggshell, as sharp fragments can irritate or injure your throat and esophagus. Always grind them into a very fine powder before use.

Because eggshells can carry bacteria such as Salmonella enteritidis, boiling them first is essential to reduce the risk of foodborne illness.

Lastly, although natural calcium sources may contain trace amounts of heavy metals like lead or cadmium, research shows that eggshells generally contain lower levels than alternatives such as oyster shells, making them a safer option when properly prepared.

Disclaimer: This content is intended for informational purposes only and should not replace professional medical advice, diagnosis, or treatment. The information is based on current research but may not apply to everyone. Always consult a healthcare professional or registered dietitian before changing your diet, especially if you have existing health conditions or concerns.