Headlines like “Stop throwing eggshells away. Boil eggshells and say goodbye to…” are usually designed to spark curiosity. Boiled eggshells do have some practical uses, but they’re not a cure-all.
Here are some evidence-based uses for eggshells:
1. Garden Fertilizer
Eggshells are made mostly of calcium carbonate. Crushed shells can add calcium to compost or soil, but they break down slowly, so they are not a quick fertilizer.
2. Compost
Eggshells are an excellent addition to a compost pile because they contribute minerals and help improve the finished compost.
3. Calcium Supplement (With Caution)
Some people dry, sterilize, and finely grind eggshells into a powder to use as a calcium source. However:
- The shells should be thoroughly cleaned and heated to reduce the risk of bacteria.
- It’s best to discuss this with a healthcare professional before using homemade calcium supplements, as dosing and contamination can be concerns.
4. Seed Starters
Half eggshells can be used as biodegradable pots for starting seedlings, then planted directly into the soil.
Does Boiling Eggshells Help Plants?
Boiling eggshells releases only a small amount of calcium into the water. The resulting “eggshell tea” is unlikely to provide a meaningful nutrient boost compared with using a balanced fertilizer or compost.
Myths
There is little or no scientific evidence that boiled eggshells:
- Cure arthritis or joint pain.
- Dramatically improve plant growth.
- Eliminate household pests on their own.
- Detoxify the body.
If you saw a headline ending with “say goodbye to…”, tell me what it claimed (for example, pests, weeds, joint pain, or something else), and I can explain whether there’s good evidence behind that specific claim.
