So consuming large amounts of eggshell powder simply because it contains calcium isn’t a good idea.

What About Eggshells and Stronger Bones?

There is some interesting research here, but it needs to be interpreted carefully.

A controlled study involving postmenopausal women investigated meals fortified with eggshell powder and vitamin D. The researchers reported a reduction in the decline of femoral-neck bone density in the intervention group. (PubMed Central (PMC))

But notice an important detail:

The participants weren’t simply drinking homemade eggshell water.

They consumed a controlled food preparation containing measured eggshell calcium and vitamin D.

That distinction is critical.

It provides evidence that eggshell-derived calcium can potentially be used as a calcium source under controlled conditions. It does not prove that a homemade eggshell drink will prevent osteoporosis.

The Food-Safety Problem

Eggshells aren’t sterile.

Eggs can carry microorganisms, including Salmonella, and the shell can become contaminated from the environment or during handling.

Research examining eggshell use as a food ingredient has specifically identified microbiological contamination as an important safety concern. (PubMed Central (PMC))

That’s one reason researchers investigating eggshell calcium have used controlled preparation methods.

If you’re reusing eggshells in the garden, this is much less concerning than trying to consume them.

If You Want to Reuse Eggshells, the Garden Is the Simpler Option

For most households, one of the easiest uses is simply:

Step 1: Rinse the shells

Remove remaining egg material.

Step 2: Let them dry completely

You can air-dry them thoroughly.

Step 3: Crush them

Break them into small pieces.

Step 4: Add them to compost or soil

Mix them into compost or incorporate finely crushed shells into garden soil.

This gives the shells another purpose instead of sending them straight to the garbage.

Can Eggshells Get Rid of Garden Pests?

You’ve probably seen another popular claim that eggshells create a protective barrier against slugs and snails.

This claim is frequently repeated online, but crushed eggshells shouldn’t be considered a reliable pest-control method.

If you’re dealing with serious slug or snail damage, proven garden-management strategies are more dependable than relying on a ring of eggshells.

What About Cleaning With Eggshells?

Some people also use crushed eggshells as a mild abrasive for cleaning bottles or containers.

The idea is simple: small particles can help physically loosen residue when combined with water and agitation.

But this isn’t appropriate for every surface.

Avoid using abrasive material on delicate, easily scratched cookware, glass, or nonstick coatings.

Don’t Throw Eggshells Into the Sink

Even though eggshells are small, sending them down a kitchen drain isn’t a great habit.

Pieces can accumulate with other food debris and potentially contribute to drainage problems.

It’s much more useful to put them into compost or save them for garden use.

A Better Way to Think About Eggshells

The most accurate message isn’t:

“Boil eggshells and say goodbye to every health problem.”

It’s this:

Eggshells are a calcium-rich kitchen byproduct that can be reused—but the use matters.

For gardening, composting, and certain household applications, they’re an easy way to reduce waste.

For human consumption, however, preparation, dosage, contamination, and individual health circumstances matter considerably.

What You Shouldn’t Believe About Eggshells

Be cautious when you see claims saying eggshells can:

Cure arthritis
Reverse osteoporosis
Repair damaged joints
Clean arteries
Cure stomach problems
Eliminate kidney disease
Replace calcium supplements
Treat high blood pressure
Prevent every bone problem

These are far stronger claims than the available evidence supports.

Calcium is important for normal health, but that doesn’t make eggshells a universal treatment.

The Bottom Line

Eggshells really are more useful than they look.

They’re primarily made of calcium carbonate, and researchers have investigated processed eggshell powder as a potential source of dietary calcium. (PubMed)

But the viral advice to simply boil eggshells and drink the water should not be presented as a proven cure or guaranteed health remedy.

If your goal is to avoid waste, crushed eggshells can be particularly useful in compost and gardening.

If your goal is to increase calcium intake, established foods such as dairy products, calcium-fortified foods, certain vegetables, tofu, and fish with edible bones provide much more predictable nutritional sources. (ODS)

And if you’re considering consuming eggshell powder specifically as a calcium supplement, it’s better to discuss it with a healthcare professional rather than guessing at the dose or preparation.