Egg white protein is the collection of proteins found in the clear, viscous part of an egg surrounding the yolk. It delivers about 11.5 grams of protein per tablespoon in dried powder form, with virtually no fat, no cholesterol, and no carbohydrates. This makes it one of the leanest protein sources available, whether you eat it as whole cooked egg whites or as a supplement powder.
What’s Actually in Egg Whites
Egg whites aren’t a single protein. They contain several distinct proteins, each making up a different proportion. The dominant one, ovalbumin, accounts for about 54% of the total protein content and is widely used as a nutrient supplement. Ovotransferrin makes up roughly 12% and plays a role in transporting minerals like iron. Ovomucoid contributes about 11%, and smaller fractions include ovomucin and lysozyme at around 3.5% each. Lysozyme has natural antimicrobial properties and is even used as a food preservative in some products.
Beyond protein, egg whites supply a handful of useful micronutrients. A single tablespoon of dried egg white powder provides about 0.32 mg of riboflavin (vitamin B2), which supports energy metabolism, and 17.5 mcg of selenium, a mineral involved in thyroid function and antioxidant defense. They also contain small amounts of pantothenic acid (vitamin B5). What they don’t contain is just as notable: egg whites carry essentially zero fat and zero cholesterol, since all of an egg’s fat and cholesterol sit in the yolk.
Protein Quality Compared to Other Sources
Not all proteins are created equal. The standard measure of protein quality is the PDCAAS (protein digestibility corrected amino acid score), which rates how well your body can digest and use a protein on a scale from 0 to 1.0. Egg white protein scores a perfect 1.0, meaning it contains all the essential amino acids in the right proportions and your body absorbs them efficiently. Very few whole-food protein sources hit this mark.
This high score comes from egg white’s complete amino acid profile. It contains all nine essential amino acids, the ones your body cannot produce on its own. For comparison, many plant proteins score well below 1.0 because they’re low in one or more essential amino acids. Egg white protein sits in the same top tier as whey and casein for overall quality, but without the dairy.
How It Differs From Whey Protein
The most common protein supplement on the market is whey, which comes from milk. If you tolerate dairy well, whey is a fine choice. But egg white protein has a clear advantage for anyone with lactose intolerance or a dairy allergy. It’s 100% lactose-free and contains no casein, both of which are common triggers for bloating, gas, and digestive discomfort.
Egg white protein is also naturally very low in carbohydrates, making it appealing for people following low-carb or ketogenic diets. The taste and texture differ from whey: egg white protein powders tend to mix slightly thinner and have a more neutral flavor, though this varies by brand. Some people find it gentler on the stomach overall, particularly those who’ve experienced digestive issues with whey concentrates.
How Egg White Protein Is Made Safe
Raw egg whites carry a small risk of bacterial contamination, which is why both liquid and powdered egg white products go through pasteurization. This process uses carefully controlled heat to destroy harmful microorganisms without completely breaking down the protein structure. In the United States, liquid egg whites are typically pasteurized at 56.7°C (about 134°F) for 1.75 minutes. The UK and Australia use slightly different temperature and time combinations.
Raw egg whites also contain a protein called avidin, which binds to biotin (vitamin B7) and prevents your body from absorbing it. Cooking or pasteurization deactivates avidin, so this is only a concern if you’re consuming large amounts of truly raw, unprocessed egg whites. Any commercial egg white protein powder or pasteurized liquid product has already been heat-treated enough to eliminate this issue.
After pasteurization, powdered versions are spray-dried to remove moisture, resulting in a shelf-stable product that retains its protein content and amino acid profile.
How Heat Changes Egg White Protein
Egg white proteins start to change their shape (a process called denaturation) at temperatures above 50 to 60°C (122 to 140°F). This is what makes liquid egg whites turn from clear to opaque white when you cook them. At moderate cooking temperatures between 60 and 90°C, the proteins unfold more extensively and form the firm, solid texture you see in a cooked egg.
This structural change doesn’t destroy the protein’s nutritional value. Your body still breaks it down into the same amino acids whether the egg white is cooked soft or hard. What changes is the protein’s functional behavior: its ability to foam, gel, and emulsify. These properties are why egg whites are used in meringues, soufflés, and as binding agents in baking. The foaming ability comes from proteins trapping air bubbles, while the gelling ability comes from proteins linking together into a solid network when heated.
If you’re using egg white protein powder in smoothies or cold drinks, the proteins remain in their native, undenatured state. If you bake with it, the heat will cause gelling and firming, which can actually improve the texture of protein pancakes, muffins, and similar recipes.
Who Benefits Most From Egg White Protein
Egg white protein fills a specific niche. It’s ideal if you need a high-quality, complete protein but can’t tolerate dairy. It’s also useful if you’re watching your fat and cholesterol intake closely, since you get the protein benefits of eggs without any of the yolk’s lipids. Athletes and bodybuilders have used egg white protein for decades precisely because of its lean profile and high digestibility.
There is one important exception: egg allergy. Ovomucoid, the protein making up about 11% of egg white, is the primary allergen responsible for egg allergies. If you have a diagnosed egg allergy, egg white protein in any form (cooked, powdered, or liquid) is not safe for you. Egg allergy is one of the most common food allergies in children, though many outgrow it by adolescence.
For everyone else, egg white protein offers a versatile, well-absorbed source of all essential amino acids. You can get it from whole egg whites (about 3.6 grams of protein per large egg white), from cartons of pasteurized liquid egg whites, or from dried egg white protein powder that mixes into shakes, oatmeal, and baked goods.