Boil eggshells and say goodbye to the …

Boil for 10 minutes to sterilize.

Dry completely (in sunlight or an oven).

Grind into a fine powder using a blender.

Store in a clean jar and use small amounts (½ teaspoon per day) in smoothies or soups.

For plants:

Boil crushed eggshells in water for 10–15 minutes.

Let the mixture cool, strain it, and use it to water your plants.
This provides calcium and helps balance soil acidity.