Eggshell membrane is the thin, fibrous layer inside a chicken eggshell that sits between the hard shell and the egg white, and it is used as a dietary supplement primarily for joint health.
For the full breakdown, see our best Eggshell Membrane Supplement For Dogs guide.
If you’ve ever cracked a raw egg and noticed the thin, clingy film stuck to the inside of the shell, that’s the eggshell membrane. It looks unremarkable, but this natural mesh of proteins and collagen has drawn serious attention from supplement makers and researchers. Most people confuse it with the shell itself, but the membrane is something separate entirely — a tough, flexible inner liner that protects the egg and now shows real promise for easing stiff joints.
What Exactly Is Eggshell Membrane Made Of?
Eggshell membrane is mostly protein — about 90% by weight, according to proteomics studies. The rest breaks down into roughly 3% lipids, 2% sugars, and small amounts of calcium and magnesium. Researchers have identified 472 distinct protein species inside the membrane, including collagen types I, V, and X alongside glycoproteins, proteoglycans, and fibronectin. This rich protein profile is what makes the membrane useful beyond just protecting the egg; it is a dense source of structural compounds that support connective tissues.
How Thick Is Eggshell Membrane?
The membrane is incredibly thin — roughly 0.07 millimeters, or about 70 micrometers. For context, that’s thinner than a human hair. Despite this tiny thickness, it is a double-layered meshwork. Anatomical descriptions often name an outer shell membrane, an inner shell membrane, and a limiting membrane closest to the egg white. This layered structure forms a porous, fibrous scaffold that helps the eggshell calcify during formation and blocks bacteria from sneaking into the developing egg.
Eggshell Membrane for Joint Health: What the Evidence Says
The best-researched use of eggshell membrane as a dietary supplement is for osteoarthritis and joint stiffness. Clinical trials have used 300–500 mg daily for 2 to 12 weeks. Oral use at up to 500 mg daily is considered possibly safe over these short-to-medium durations.
The catch: the scientific support is limited almost entirely to joint pain and stiffness. Claims about skin, advanced collagen synthesis, or inflammation reduction are not well established by good evidence. It is important to distinguish the native membrane from processed, hydrolyzed supplement powders — the two are chemically different, and supplement labels do not always clarify which form is inside the bottle.
Who Should Be Cautious About Eggshell Membrane?
Because eggshell membrane is an egg-derived ingredient, anyone with a known egg allergy should treat it as a potential concern. The research brief does not provide safety data for this group, so it is best to consult a healthcare provider before trying the supplement. The caution applies to both human supplements and any pet version you might bring into your home. Beyond this, the evidence for topical use (creams or ointments) is weak — safety on the skin is not well established, and many advertised cosmetic benefits outrun what the science actually supports.
FAQs
Is eggshell membrane the same as the eggshell itself?
No, they are two completely different materials. The hard, brittle outer shell is mostly calcium carbonate. The membrane is the thin, flexible, paper-like film stuck to the inside of that shell — it is mostly protein and collagen, not calcium.
Can you get eggshell membrane from eating whole eggs?
Not in any meaningful amount. The membrane is so thin and tightly adhered to the shell that you cannot separate it by eating a boiled egg. Supplements use membrane harvested and processed from commercial egg-breaking operations, then dried and powdered for concentrated dosing.
How much eggshell membrane should you take daily for arthritis?
Most clinical studies use 300–500 mg per day, taken as a single dose, for up to 12 weeks. Always start with the lower end and check with your doctor before beginning any new supplement routine, especially if you take other medications.
References & Sources
- NIH / PMC. “Eggshell Membrane: A Review of Composition and Biomedical Applications.” Reviews the membrane’s protein composition and clinical evidence for joint health.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.