Eggshells are often thrown away, but they are primarily made of calcium carbonate and can have several practical uses around the home and garden.
What Are Eggshells Made Of?
A typical eggshell contains:
- Calcium carbonate (about 95%)
- Small amounts of magnesium, phosphorus, and other minerals
- Protein-rich membrane lining the shell
1. Garden Fertilizer
Crushed eggshells can add calcium to garden soil.
How to Use
- Rinse the shells thoroughly.
- Allow them to dry completely.
- Crush into small pieces.
- Mix into soil around plants.
This can be especially helpful for calcium-loving plants such as tomatoes and peppers.
2. Compost Booster
Eggshells break down in compost and contribute valuable minerals.
Tip
Crush them before adding to compost to help them decompose more quickly.
3. Natural Pest Barrier
Some gardeners sprinkle crushed eggshells around plants to discourage soft-bodied pests.
4. Homemade Calcium Powder
Some people grind thoroughly cleaned, dried, and baked eggshells into a fine powder for use in recipes or supplements. However, safety and quality can vary, and excessive calcium intake may be harmful.
Always consult a healthcare professional before using eggshell powder as a dietary supplement.
5. Seed Starters
Half eggshells can be used as biodegradable seed-starting containers.
- Fill clean shell halves with potting soil.
- Plant seeds.
- Water lightly.
- Transplant the shell and seedling directly into the garden when ready.
Common Health Claims
You may see claims online such as:
- “Eggshell rebuilds knee collagen.”
- “Eggshell cures arthritis.”
- “Eggshell restores bones instantly.”
These claims are not supported by strong scientific evidence. While eggshells contain calcium, they are not a proven cure for joint pain, arthritis, or collagen loss.
Safety Notes
- Wash eggshells thoroughly before reuse.
- Avoid consuming raw eggshells due to the risk of bacterial contamination.
- If preparing eggshell powder, shells should be properly cleaned and heated to reduce contamination risks.
- Too much calcium from any source can be harmful.
The Bottom Line
Eggshells can be useful in gardening, composting, and other household projects. While they are rich in calcium, claims that eggshells can dramatically restore collagen, cure joint problems, or provide miracle health benefits should be viewed with caution. 🥚🌱✨
