Most people crack an egg, prepare breakfast, and throw the shells straight into the trash. But eggshells are more useful than they might appear. Made primarily of calcium carbonate, they can be reused in several practical ways around the home and garden.

Instead of wasting them, you can turn clean eggshells into a useful addition to your compost, try them in certain gardening projects, or use them for creative crafts. They are inexpensive, easy to collect, and offer a simple way to reduce household waste.

However, not every popular eggshell tip is supported by science. For example, eggshells are not a proven treatment for stronger bones, healthier skin, or whiter laundry. Some uses also require careful preparation to avoid contamination or damage.

Here are 12 practical ideas for giving eggshells a second life, along with important precautions.

1. Add Eggshells to Your Compost

One of the easiest ways to reuse eggshells is to add them to your compost pile. Eggshells contain calcium carbonate, which can eventually contribute calcium to the finished compost.

Rinse away any remaining egg, allow the shells to dry, and crush them into small pieces before adding them to your compost. Grinding them more finely helps them break down faster.

Remember that eggshells decompose slowly, especially when left in large pieces. They are best treated as one small ingredient in a balanced compost mixture rather than a complete fertilizer.