Did you know that eggshells made of 95% calcium carbonate? Not surprisingly, people have been relying on eggshells for years as a great way to get their daily recommended calcium intake. Eggshell calcium benefits the body in a number of ways, most notably by promoting bone density and healthy teeth. But eggshell calcium also promotes joint, digestive and immune system health. Due to popular demand, we’ve reintroduced this historic form of calcium with Swanson Ultra Eggshell Calcium with Vitamin D-3. Our eggshell calcium supplement comes with added vitamin D to ensure maximum absorption.