The thin fibrous layer between an egg white and its shell, separated industrially and dried into a powder. It contains collagen, elastin, glycosaminoglycans and glucosamine in small amounts.
Eggshell membrane is a genuinely elegant idea — an abundant by-product of egg processing that happens to contain most of the connective tissue components sold separately as joint supplements — and a small, narrow evidence base. The trials are almost all of one branded preparation, mostly funded by its manufacturer, and report reductions in joint pain and stiffness within a week or two at 500 mg daily. Independent replication outside that commercial relationship is limited. The dose is strikingly low compared with glucosamine and chondroitin, which is either an argument for an active signalling mechanism or a reason for scepticism, depending on how the trials are read.
Sold as
Capsule, Powder, Combination joint formulas
Standardised to
Branded preparations are defined by their manufacturing process; generic eggshell membrane powder is not standardised — a product without this marker may not resemble what was studied.
Also known as
NEM, Natural eggshell membrane, Ovomet
Regulation: Sold as a dietary supplement in the US with no pre-market efficacy review. Almost all published trials concern one proprietary preparation.
What the research used
The amounts, forms and durations published trials of Eggshell membrane actually administered.
These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.
Studied for Joint pain and stiffness
500 mg
Limited
Eggshell membrane powder, once daily · 4–12 weeks
The dose used across nearly all published trials, most of them of one branded product and most manufacturer-funded. Sample sizes are typically under a hundred.
This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.
When it was taken
Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.
None of the timings below were directly compared in a trial. They reflect how the research happened to dose, or what the pharmacology implies — which is not the same as a timing being better.
🕐Any time
Not enough
Trials dosed once daily without comparing timings. No timing question has been tested.
Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.
The evidence in depth
Best supported: Limited
What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.
Small randomised trials report reduced joint pain and stiffness within one to two weeks at 500 mg daily, including in people with exercise-related joint discomfort. Nearly all of this evidence concerns one proprietary preparation and was manufacturer-funded, and independent replication is limited.
What may be going on: The membrane supplies collagen, elastin, hyaluronic acid and glycosaminoglycans, and has reduced inflammatory cytokine production in laboratory work. The effective dose is far lower than for isolated glucosamine, which the mechanism does not obviously explain.
Limited evidence. Early human work, or mostly lab and animal research.
Deep research mode adds each paper’s own conclusion and stated limitations.
Things to know
Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.
Allergy
Egg allergen
Eggshell membrane carries residual egg white protein, and egg is a major allergen capable of causing anaphylaxis. Anyone with egg allergy should not take it, regardless of processing claims.
Worth knowing
One product, mostly one funder
The trial literature is essentially the evidence base for a single branded ingredient, generated largely with its manufacturer's support. Generic eggshell membrane powder has no evidence of its own.
Worth knowing
Short trials and small samples
Published studies run weeks rather than months, in fewer than a hundred participants each, with self-reported pain as the endpoint. Longer-term data do not exist.
Avoid
No data in pregnancy
There is no safety data in pregnancy or breastfeeding, the usual reason to leave it alone during either.
In the food catalogue
The whole-food form, where one exists. The evidence for a concentrated extract rarely transfers to the food, or the other way round — these are cross-links, not equivalents.