A single large egg contains meaningful amounts of at least eight vitamins, most of them concentrated in the yolk. You’ll get vitamins A, D, E, K, and several B-complex vitamins, plus choline, which is often grouped with B vitamins. Few other single foods deliver this range of nutrients in one package.
Fat-Soluble Vitamins: A, D, E, and K
The yolk carries all four fat-soluble vitamins. Vitamin A supports vision and immune function. Vitamin D helps your body absorb calcium for bone health. Vitamin E acts as an antioxidant, protecting cells from damage. Vitamin K plays a role in blood clotting and bone metabolism. Because these vitamins dissolve in fat rather than water, the natural fats in the yolk actually help your body absorb them. Research published in Frontiers in Nutrition found that fat-soluble vitamins solubilized within yolk lipids are absorbed more efficiently through the intestinal wall than the same vitamins taken as isolated supplements.
Vitamin D deserves special attention because so few foods contain it naturally. A standard large egg provides roughly 6% of the daily value, which is modest but adds up across a typical diet. The amount varies depending on what the hen eats: studies show a direct, linear relationship between vitamin D levels in hen feed and the concentration that ends up in the yolk.
B-Complex Vitamins
Eggs are a strong source of several B vitamins that support energy production, red blood cell formation, and nervous system function.
Riboflavin (B2) is one of the standout nutrients. A large egg supplies roughly 15% of your daily value, helping your body convert food into usable energy and maintain healthy skin and eyes. Pantothenic acid (B5) is present in even higher concentrations per weight, contributing to the production of hormones and the metabolism of fats. Vitamin B12, critical for nerve health and DNA synthesis, shows up almost entirely in the yolk, with very little in the white. One large egg provides a meaningful portion of the daily B12 target, making eggs especially useful for vegetarians who don’t eat meat or fish.
Smaller amounts of folate and thiamin (B1) round out the B-vitamin profile, though cooking reduces these heat-sensitive vitamins. USDA retention data shows that boiling, frying, or poaching an egg preserves about 75% of its folate and 80 to 85% of its thiamin. That’s a moderate loss, but enough of both vitamins survive cooking to still contribute to your intake.
Choline: The Overlooked Nutrient
Choline isn’t technically classified as a vitamin, but it functions like one and most people don’t get enough of it. It’s essential for brain signaling, liver function, and cell membrane structure. During pregnancy, adequate choline intake supports fetal brain development.
One large hard-boiled egg contains 147 mg of choline, which is 27% of the daily value of 550 mg. That makes eggs one of the richest food sources of choline available. You’d need to eat roughly a cup and a half of broccoli or several servings of chicken breast to match the choline in two eggs.
Lutein and Zeaxanthin for Eye Health
Egg yolks contain two carotenoids, lutein and zeaxanthin, that accumulate in the retina and help protect against age-related macular degeneration. Cooked egg yolk provides about 645 micrograms of lutein and 587 micrograms of zeaxanthin per 100 grams. While spinach and kale contain higher absolute amounts, the fat in egg yolk makes these compounds more bioavailable. Your body absorbs a larger percentage of the lutein from an egg than from a low-fat vegetable source.
Yolk vs. White: Where the Vitamins Are
If you’ve been tossing the yolk to cut calories or cholesterol, you’re discarding nearly all of the vitamins. The yolk contains significant amounts of vitamins A, D, E, K, and the full suite of B-complex vitamins, along with iron and zinc. Egg whites, by contrast, consist primarily of protein and water with virtually no fat, cholesterol, or fat-soluble vitamins. The white does contain some riboflavin and small amounts of other B vitamins, but the nutritional gap between the two parts is dramatic.
Eating the whole egg also improves how well you absorb the nutrients it contains. The yolk’s fats act as a built-in delivery system for its own fat-soluble vitamins and carotenoids.
How Cooking Affects Vitamin Content
Heat degrades some vitamins more than others. The fat-soluble vitamins (A, D, E, K) are relatively stable during normal cooking. B12 and riboflavin also hold up well. The most vulnerable nutrients are folate, thiamin, and vitamin C (eggs contain only trace amounts of C to begin with).
Across all common cooking methods, the losses are fairly consistent. Baking, frying, scrambling, hard-boiling, and poaching all retain about 75% of folate and 80 to 85% of thiamin. No single method is dramatically better or worse than another for preserving vitamins. The biggest variable isn’t how you cook the egg but whether you eat the yolk.
Do Pasture-Raised Eggs Have More Vitamins?
The answer is less clear-cut than marketing suggests. Earlier research found that pasture access significantly increased vitamin A and E levels in egg yolks, likely because hens eating grass, insects, and other foraged foods take in more of these nutrients. However, a more recent study published in Foods found no statistically significant differences in vitamin A, D3, or E content between pasture-raised and cage-free eggs when diet composition was controlled. Pasture-raised eggs in that study did trend higher in vitamin E (roughly double the cage-free average), but the variation between individual eggs was too wide to call it a reliable difference.
What does seem consistent is that the hen’s total diet matters more than pasture access alone. Hens fed vitamin-enriched feed produce yolks with correspondingly higher vitamin levels, particularly for vitamin D. If a carton advertises elevated vitamin D or omega-3 content, it’s typically because the feed was supplemented, not simply because the hens went outside.