Eggshell membrane: what are the side effects and for whom?

Does eggshell membrane have side effects?

Randomized controlled trials published since 2022 report no significant adverse effects attributed to eggshell membrane. This observation applies to the tested doses, from 300 to 600 mg per day, over durations of 8 to 12 weeks.

Here you are taking a connective tissue reduced to powder, not an isolated molecule at a high dose. The membrane provides collagen of types I, V, and X, elastin, hyaluronic acid, glycosaminoglycans, and glucosamine, in their natural proportions.

This complete matrix explains the dosage. Where marine collagen is consumed by the gram, the membrane is used at 300 mg per day, an amount that mechanically limits the digestive load.

Here's what the three most recent trials report.

Trial	Dose tested	Duration	Participants	Reported tolerance
Cánovas et al., Nutrients, 2022	300 and 500 mg/day	8 weeks	Adults with knee joint discomfort	Dose-dependent response, no tolerance signal reported
Park S. et al., Journal of Functional Foods, 2024	Natural membrane	12 weeks	99 adults	No serious adverse effects associated with intake
Park M. et al., Journal of Functional Foods, 2025	600 mg/day	12 weeks	100 women aged 25 to 60	No adverse effects reported

A meta-analysis published in Nutrients in 2024 grouped seven randomized trials on eggshell membrane, five of which were retained for quantitative analysis. It confirms the consistency of these observations across the entire available body of literature.

The rare discomforts reported in this type of treatment remain digestive and transient: a feeling of heaviness or bloating at the beginning of intake, as with many capsules taken on an empty stomach.

What these data don't say

"No reported side effects" does not mean "no possible side effects." The nuance changes how you should read these numbers.

Combined, the published trials on eggshell membrane involve a few hundred participants. A rare effect, affecting one in a thousand people, would not be detectable in samples of this size.

Duration also matters. Protocols stop at 8 or 12 weeks. No one has published follow-ups over two or three years, so no one can state with certainty what continuous intake over that period yields.

Last point: each trial focuses on a specific extract, from a specific supplier. The results obtained with Spanish Ovomet® or a Korean membrane document the generic ingredient, not a particular brand.

Why egg allergy is the true contraindication

Several French websites claim that the membrane does not contain the proteins responsible for egg allergy, ovalbumin and ovomucoid, because they are concentrated in the white and yolk. Proteomic analyses say otherwise.

Published work on the proteome of eggshell membrane identifies several hundred proteins, including abundant egg white proteins: ovalbumin, ovotransferrin, and lysozyme. The membrane is bathed in the white throughout egg formation.

The consequence is regulatory, not just scientific. Regulation (EU) No 1169/2011 classifies eggs and egg-based products among the fourteen allergens requiring mandatory declaration. A membrane-based supplement must therefore bear the mention "contains egg."

A manufacturer who writes "allergen-free" on an egg membrane-based product creates difficulties with the DGCCRF (French Directorate General for Competition, Consumer Affairs and Fraud Control). We declare the egg allergen on the label and in the list of ingredients.

What this means for you in practice

• Diagnosed egg allergy: Do not take this type of supplement without your allergist's advice.
• History of egg allergy in childhood: Tolerance often changes with age, but the decision rests with your doctor.
• Fish or shellfish allergy: This does not concern egg membrane, which contains no ingredients of marine origin.
• Vegan diet: The membrane is still of animal origin, even without slaughter. It is suitable for ovo-vegetarian diets.

Glucosamine and chondroitin: Anses's opinion concerns different dosages

Anses (French Agency for Food, Environmental and Occupational Health & Safety) published an opinion in March 2019 advising against supplements containing glucosamine and chondroitin sulfate for several populations. This opinion is widely circulated, and it is often incorrectly applied to eggshell membrane.

It is based on 74 reports of adverse effects received by the nutrivigilance system between 2009 and February 2018: digestive disorders, abdominal pain, skin rashes, liver damage.

Anses draws up a list of populations for whom these supplements are not recommended: people with diabetes or pre-diabetes, asthmatics, those treated with vitamin K antagonists, pregnant or breastfeeding women, and children.

The point that no one raises: the supplements in question dose glucosamine and chondroitin by the gram. Eggshell membrane, however, provides them by the milligram.

Molecule	Contribution in 300 mg of membrane	Common dosage of targeted joint supplements	Difference
Glucosamine	6 mg	Around 1,500 mg/day	250 times less
Chondroitin sulfate	6 mg	Around 1,200 mg/day	200 times less

This difference does not eliminate caution; it puts it into perspective. If you are on vitamin K antagonists, diabetic, or asthmatic, discuss it with your doctor before any treatment. They can make a judgment based on figures rather than a product category.

Who should seek medical advice before a course of treatment

Four situations warrant prior medical advice, regardless of the ingredient's tolerance profile.

• Pregnancy and breastfeeding. No clinical trials have been conducted on these populations. The absence of data is not proof of safety, and we advise against taking it without medical advice.
• Children and adolescents. Same reason. The published protocols involve adults, mostly over 40.
• Ongoing anticoagulant treatment. The cases described in the literature concern doses of glucosamine and chondroitin incomparable to those in the membrane. Verification remains the responsibility of your doctor or pharmacist.
• Chronic pathology or long-term treatment. A food supplement is not a medicine and does not replace any treatment. Report it as you would any new intake.

A note on the formula itself: our capsule provides 80 mg of vitamin C, or 100% of the reference nutritional values. If you are already taking a multivitamin complex, add up the intakes rather than ignoring them.

In all other cases, a course of eggshell membrane at the indicated dose does not require any special precautions beyond common sense: one dose, a glass of water, regularity.

Three misconceptions to dismiss

"Eggshell is calcium, so watch out for kidney stones."

The membrane is not the shell. It is the film lining the inside, mechanically separated from the mineral part. Its composition is protein, not calcium.

"It will raise my cholesterol."

Egg cholesterol is found in the yolk. The membrane does not contain any, and 300 mg of powder represents a negligible nutritional intake on a daily scale.

"Natural, so I can increase the doses."

The trial by Cánovas et al. compared 300 and 500 mg per day. Nothing indicates that going beyond provides more, and the tested dosage remains the only one whose tolerance has been documented.

A fourth belief deserves to be corrected in the other direction: "it's recycled waste, so it's poor quality." The membrane comes from eggshells from the egg product industry, meaning eggs already cracked for human consumption.

France produces approximately 40,000 tons of eggshells per year. Reclaiming them changes the trajectory of the co-product, not its biological composition, which is still analyzed batch by batch.

How to conduct your treatment calmly

Take the dose indicated on the label, with a large glass of water. At SuperNutrition, this corresponds to 2 capsules per day, in one or two doses.

If you have a sensitive stomach, take your capsules with a meal rather than on an empty stomach. This is the simplest measure to limit any potential digestive discomfort at the start of the treatment.

Allow 2 months of regular intake before evaluating anything, and 3 months for a more reliable reading. Published protocols last 8 to 12 weeks, and connective tissues regenerate slowly.

Check the label before buying: origin of the membrane, exact quantity in milligrams, mention of the egg allergen, availability of an analysis certificate. These four pieces of information tell you more than any marketing argument.

A useful benchmark: a brand that refuses to publish the breakdown of its active ingredient asks you to take its word for it. We publish ours, milligram by milligram, on the product page.

The rest depends on your habits. For skin as well as joint comfort, sleep, sun protection, and physical activity weigh more than a supplement taken alone.

Frequently Asked Questions

Can it be taken in case of shellfish allergy?

Yes. Glucosamine in classic joint supplements often comes from shellfish shells, which is not the case here: the membrane's glucosamine is native to the egg. Our formula contains no shellfish or fish.

Does eggshell membrane cause weight gain?

No. A daily dose of 300 mg provides less than two calories. No trial has reported weight variation linked to intake.

Can it be combined with other supplements?

Yes, combining it with magnesium, omega-3, or vitamin D poses no known difficulties. Be mindful of duplicate vitamin C intake if you are already taking a formula that contains it.

Should breaks be taken between two treatments?

No data requires a cessation period. Published trials stop at 12 weeks, so continuous intake beyond that is a decision to be made with your doctor.

Capsules or powder: Is there a difference in tolerance?

The form does not change the tolerance of the active ingredient. However, capsules avoid the taste and make it easier to adhere to the dose, which is important for maintaining a two-month treatment.

What to do if bloating occurs?

Take it in the middle of a meal and split it into two doses. If discomfort persists, stop and talk to your doctor or pharmacist.

How to know if a product is properly dosed?

Look for the quantity of membrane expressed in milligrams per daily dose, not a percentage or a "collagen complex" mention. Published protocols place the documented range between 300 and 500 mg per day.

Cited studies

• Cánovas F., Abellán-Ruíz M.S., García-Muñoz A.M. et al. "Randomised Clinical Trial to Analyse the Efficacy of Eggshell Membrane to Improve Joint Functionality in Knee Osteoarthritis". Nutrients, 2022, 14(11), 2340. Consult
• Park S., Ko S.H., Yoon N.K. et al. "Efficacy of natural eggshell membrane for knee osteoarthritis: A randomized, double-blind, placebo-controlled clinical trial". Journal of Functional Foods, 2024, 121, 106449. Consult
• García-Muñoz A.M. et al. "Efficacy of Eggshell Membrane in Knee Osteoarthritis: A Systematic Review and Meta-Analysis". Nutrients, 2024. Consult
• Park M., Won K., Lee J.H. et al. "Effects of oral supplementation with eggshell membrane (Ovoderm®-AS) on skin health: A randomized, double-blind, placebo-controlled trial". Journal of Functional Foods, 2025, 127, 106713. Consult

Regulatory and supplementary sources

• Anses. "Certain joint-focused food supplements not recommended for at-risk populations", March 29, 2019. Consult
• Regulation (EU) No 1169/2011 on the provision of food information to consumers, Annex II (list of allergens requiring mandatory declaration).
• Regulation (EU) No 432/2012 establishing a list of permitted health claims. Collagen is not listed as a nutrient bearing a claim therein.
• Rath N.C. et al. "Chicken Egg Shell Membrane Associated Proteins and Peptides", 2015. Consult

A food supplement is not a medicine. It is part of a healthy lifestyle and is not a substitute for a varied and balanced diet.

The cited works do not constitute authorized health claims within the meaning of Regulation (EC) No 1924/2006 and do not prejudge any individual results.