You may have seen headlines like “Stop throwing them away! Boil eggshells and say goodbye to…” followed by bold health claims. Some versions of this article include confusing or mistranslated passages that make it hard to separate fact from fiction.
Let’s cut through the noise with science-based, practical information about eggshells—what they can (and can’t) do, how to prepare them safely, and when to talk to a healthcare provider.
What Eggshells Actually Contain
Eggshells are primarily composed of **calcium carbonate **(~90–95%), along with small amounts of:
Magnesium
Phosphorus
Trace minerals (strontium, fluoride, selenium)
A thin protein membrane (the “skin” inside the shell)
Fact: Calcium carbonate is a well-established, bioavailable form of calcium used in many dietary supplements.
Important: While eggshells contain calcium, consuming them requires careful preparation to avoid contamination or injury.
What Science Says About Eggshell Calcium
Potential Benefits (When Properly Prepared)
Claim
Evidence Status
Notes
Supports bone health
Supported
Calcium is essential for bone density; eggshell calcium has been studied as a supplement in clinical trials
May help prevent osteoporosis
Preliminary
Some studies show benefit, but larger, longer-term research is needed
Natural, low-cost calcium source
True
Especially valuable in resource-limited settings
Contains additional trace minerals
True
But amounts are small; not a primary source of these nutrients
What Eggshells Cannot Do:
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