Eating a single raw egg is unlikely to make you sick, but it does carry a real risk of Salmonella infection and gives your body significantly less protein than a cooked egg would. Most people who swallow a raw egg in cookie dough or a smoothie will be perfectly fine. The concern is that when things go wrong, they can go wrong fast.
The Salmonella Risk
Salmonella bacteria can live both on the shell and inside the egg itself. Contamination rates vary by region and farming practices, but studies of commercial eggs have found Salmonella in roughly 3 to 4% of egg contents tested, with even higher rates on the outer shell. In the United States, the odds of any single egg being internally contaminated are lower than in many other countries thanks to washing and refrigeration standards, but the risk is never zero.
If you do get unlucky, symptoms typically start 6 hours to 6 days after eating the contaminated egg. The illness usually involves diarrhea, stomach cramps, fever, and sometimes vomiting, and it lasts 4 to 7 days in most people. It’s unpleasant but self-limiting for healthy adults. For young children, elderly people, pregnant women, and anyone with a weakened immune system, the infection can become severe enough to require hospitalization.
You Absorb Much Less Protein
One of the most common reasons people eat raw eggs is for the protein, especially in shakes or smoothies. The irony is that cooking dramatically improves how much protein your body actually uses. Protein digestion from raw eggs is around 40% lower than from cooked eggs. So if you’re cracking a raw egg into a glass for a protein boost, you’re getting roughly half the benefit you’d get from scrambling it.
Heat changes the structure of egg proteins in a way that makes them easier for your digestive enzymes to break apart. This is why the “Rocky Balboa” approach to raw eggs is more theatrical than practical. Cooking is the simplest way to get the full nutritional value.
Biotin Deficiency From Regular Consumption
Raw egg whites contain a protein called avidin that binds tightly to biotin (vitamin B7) in your gut and prevents your body from absorbing it. One raw egg here and there won’t matter, but regularly consuming raw egg whites over weeks or months can lead to what’s sometimes called “egg white injury syndrome.” Symptoms of biotin deficiency include hair thinning, skin rashes, brittle nails, and fatigue.
Cooking solves this completely. Heat breaks down avidin so it can no longer latch onto biotin. This is only a concern with raw whites specifically, and only with chronic, repeated consumption. If you ate a raw egg once, biotin deficiency is not something you need to worry about.
Alcohol and Acid Don’t Make Raw Eggs Safe
Plenty of classic recipes use raw eggs: Caesar salad dressing, homemade mayonnaise, eggnog with spirits, mousse. A common belief is that mixing raw eggs with alcohol or acidic ingredients like lemon juice or vinegar kills any bacteria present. There’s no reliable evidence that this works. Neither the alcohol concentration in cocktails nor the acidity in salad dressings is strong enough to reliably destroy Salmonella.
The FDA specifically recommends using pasteurized eggs for any recipe where the egg won’t be fully cooked. Pasteurized shell eggs have been heat-treated at a temperature high enough to kill Salmonella but low enough to keep the egg raw in texture. They’re sold in most grocery stores, and their cartons will typically say they’ve been treated. Regular, unpasteurized eggs are required to carry safe handling instructions that include cooking yolks until firm.
What Happens in Your Body Right After
If you swallow a raw egg and it’s not contaminated, you’ll digest it without incident. You might notice the texture is unpleasant going down, especially the slippery egg white, but there’s no immediate physical reaction. Your stomach acid begins breaking down the proteins, though less efficiently than it would with a cooked egg. You’ll absorb the fat-soluble vitamins in the yolk (A, D, E, K) normally, since those aren’t affected the same way the protein is.
If the egg was contaminated, you won’t know right away. There’s a lag of at least several hours, sometimes nearly a week, before symptoms appear. During that window you’ll feel completely normal. This delay is part of why people assume raw eggs are safe after eating them: they feel fine and conclude there was no risk, when in reality they simply got an uncontaminated egg.
How to Reduce the Risk
If you choose to eat raw or undercooked eggs, a few things lower your odds of getting sick:
- Use pasteurized eggs. This is the single most effective step. Pasteurized eggs can be used raw in any recipe with minimal risk.
- Keep eggs refrigerated. Salmonella multiplies rapidly at room temperature. Eggs left out on the counter for hours carry a higher bacterial load than cold ones.
- Check for cracks. Bacteria enter more easily through damaged shells. Discard any cracked eggs.
- Use fresh eggs. The closer to the pack date, the better. As eggs age, their natural protective barriers weaken.
For the average healthy adult, eating a raw egg is a low-probability gamble rather than a guaranteed illness. But the payoff is also low: you get less protein, you risk a miserable week of food poisoning, and the taste isn’t doing you any favors. Cooking for even a few minutes eliminates nearly every downside.