Homemade Eggshell Powder

Eggshell powder is one of the simplest, most cost-effective calcium sources a home cook can make, and it's a staple in homemade cat food for good reason. Cats need a steady supply of dietary calcium to support skeletal strength, dental health, and a healthy balance with the phosphorus they take in from meat. Without an added calcium source, even a perfectly chosen blend of muscle meat and organ runs phosphorus-heavy, which over time can strain a cat's kidneys and bones. Eggshell powder fills that gap cleanly: a single ground eggshell is essentially pure calcium carbonate in a form cats absorb well, and it costs nothing beyond what you'd otherwise throw away. The case for making your own is straightforward. It's a whole food rather than a processed powder, which fits the same philosophy behind cooking your cat's meals from scratch in the first place. You know exactly where it came from. It's effectively free, and once you've made a batch, you have months of calcium for the price of an empty container. The recipes on this site were formulated with homemade eggshell powder in mind. Weighing your powder rather than estimating by the spoon keeps each batch consistent, since eggshell powder varies in bulk density depending on how finely it's ground.

Step-by-step instructions are included with the full recipe.