Who Should Not Take Egg Protein

Egg white protein powder appeals to people who avoid dairy, want a complete protein with a strong amino acid profile or simply prefer a product with few ingredients. Yet for some people it is unsuitable or even dangerous. Our editorial team explains who should steer clear of egg protein, who should check with a doctor and what to look for on the packet.

Egg protein in brief

Egg protein powders are usually made from dried egg white, sometimes labelled as egg albumen. Removing the yolk leaves a product that is very low in fat and carbohydrate, with roughly 80% protein by weight. Ovalbumin, ovotransferrin, ovomucoid and lysozyme are among the main proteins it contains.

Nutritionally, egg white is a high-quality protein with all essential amino acids and a respectable leucine content. It digests at a moderate pace, slower than whey and faster than casein, which makes it a flexible option across the day.

Because it contains no lactose and no milk proteins, egg protein is often recommended to people with cow's milk allergy or lactose intolerance. It is also suitable for vegetarians who eat eggs, though obviously not for vegans.

All of these strengths come with one major caveat: egg is one of the 14 major allergens that must be emphasised on food labels in the UK. For a significant minority of people, egg protein is simply off the table.

Egg allergy: the clearest reason to avoid it

Egg allergy is among the most common food allergies in young children in the UK. Many children outgrow it by school age, but a proportion remain allergic into adulthood, and some adults develop it later in life. Reactions range from hives and stomach pain to life-threatening anaphylaxis.

Ovomucoid is a particularly important allergen because it is resistant to heat and digestion. Some children who tolerate baked egg in cakes still react to less processed egg, and powdered egg white may be closer to raw egg in allergenic potential than to well-baked products.

Anyone with a diagnosed egg allergy should avoid egg protein powders entirely unless an allergist has specifically advised otherwise. Allergy should not be self-tested at home by trying a scoop, as reactions can be unpredictable.

Cross-contamination is another issue for people with other allergies. Many factories process milk, soy, egg and nuts on shared lines. Look for precautionary 'may contain' statements, which are voluntary but useful, and contact the manufacturer if in doubt.

Kidney disease and very high protein intake

For people with healthy kidneys, current evidence does not show that high-protein diets cause kidney damage. However, in chronic kidney disease (CKD), protein intake is often deliberately managed to reduce the workload on remaining kidney function.

People with CKD, especially stages 3–5 or those not on dialysis, should not add protein supplements without guidance from their renal team and dietitian. The appropriate intake depends on the stage of disease, treatment and other factors such as potassium and phosphate levels.

Egg white is relatively low in phosphorus compared with many other protein foods, which is why renal dietitians sometimes include it in meal plans. This is a tailored clinical decision, not a reason for someone with kidney disease to buy a tub of protein powder on their own.

Digestive tolerance and other concerns

Some people without allergy find egg white powder causes bloating, wind or a sulphurous aftertaste. Egg whites are rich in sulphur-containing amino acids, which can contribute to these effects. Trying smaller servings or a different brand may help.

Raw egg white contains avidin, a protein that binds biotin and can, in large amounts over time, contribute to biotin deficiency. Pasteurisation and processing reduce avidin activity significantly, but people eating large quantities of raw egg white should be aware of this issue.

Food safety matters too. Quality egg protein powders are pasteurised to reduce the risk of Salmonella. In the UK, eggs produced under the British Lion scheme carry low Salmonella risk, but powdered imports should still come from reputable manufacturers.

• Choose pasteurised products from businesses that state a UK or EU address.
• Check the allergen panel and any precautionary labelling.
• Start with a half serving to assess digestive tolerance.
• Store sealed and dry to prevent clumping and spoilage.

Children, pregnancy and special situations

Children and teenagers generally get enough protein from ordinary meals. The British Dietetic Association has noted that most young athletes do not need protein supplements, and foods such as eggs, milk and meat are better choices for their overall nutrition.

During pregnancy, protein needs increase modestly, but they can almost always be met from food. If a pregnant woman chooses a protein powder, it should be pasteurised and free from added herbal ingredients, caffeine or high doses of vitamin A.

People with rare inherited metabolic disorders such as phenylketonuria (PKU) require tightly controlled protein intake, and standard protein powders are unsuitable without specialist guidance.

Finally, anyone taking medicines or managing complex health conditions should discuss major dietary changes with their GP or a registered dietitian rather than relying on general online advice.

Editorial conclusions

Egg white protein is a high-quality, dairy-free option, but people with egg allergy must avoid it entirely.

Those with chronic kidney disease, metabolic disorders or complex medical needs should only use protein supplements with specialist guidance.

For everyone else, choose pasteurised, well-labelled products and start with small servings to judge tolerance.

Our editorial team suggests reading next about comparing whey, casein and egg protein, protein needs in older adults and how to read allergen labels on sports supplements.

References

1. Caubet JC, Wang J. Current understanding of egg allergy. Pediatr Clin North Am. 2011;58(2):427–443.
2. Leonard SA, Sampson HA, Sicherer SH, et al. Dietary baked egg accelerates resolution of egg allergy in children. J Allergy Clin Immunol. 2012;130(2):473–480.
3. Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 Clinical Practice Guideline for the evaluation and management of chronic kidney disease. Kidney Int. 2024;105(4S):S117–S314.
4. Devries MC, Sithamparapillai A, Brimble KS, et al. Changes in kidney function do not differ between healthy adults consuming higher- compared with lower- or normal-protein diets: a systematic review and meta-analysis. J Nutr. 2018;148(11):1760–1775.
5. Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
6. Mine Y, Yang M. Recent advances in the understanding of egg allergens: basic, industrial, and clinical perspectives. J Agric Food Chem. 2008;56(13):4874–4900.