Steak is one of the richest natural sources of B vitamins, particularly B12, B6, niacin, and riboflavin. A typical serving also delivers meaningful amounts of choline and, if the beef is grass-fed, fat-soluble vitamins A and E. The exact amounts shift depending on the cut, but every steak shares the same core vitamin profile.
B Vitamins: The Headline Nutrients
The B-vitamin family is where steak truly stands out. Per 100 grams of cooked beef (roughly a 3.5-ounce portion), USDA data shows these ranges across common cuts:
- Vitamin B12: 1.4 to 6.2 mcg. The adult daily recommendation is 2.4 mcg, so even the lowest-B12 cuts can get you more than half your daily need in a single serving. Chuck and bottom round cuts tend to land at the high end, delivering two to three times the daily target.
- Niacin (B3): 4.1 to 8.6 mg. Adults need 14 to 16 mg per day, so a serving of steak covers roughly a quarter to over half of that. Niacin helps your body convert food into energy and supports skin and nerve function.
- Vitamin B6: 0.41 to 0.66 mg. With a daily target of 1.3 mg for most adults, one serving of steak provides about a third to half of what you need. B6 plays a role in immune function and the production of mood-regulating brain chemicals like serotonin.
- Riboflavin (B2): 0.14 to 0.38 mg. The daily recommendation sits around 1.1 to 1.3 mg, so steak contributes a more modest share here, roughly 10 to 30 percent depending on the cut.
B12 is the standout. It’s almost exclusively found in animal foods, and steak is one of the most concentrated sources available. Your body uses it to make red blood cells and maintain healthy nerve tissue. People who eat steak regularly are unlikely to develop a B12 deficiency.
Choline: The Overlooked Nutrient
Steak delivers roughly 92 to 110 mg of choline per 100 grams, according to USDA data. That’s a significant contribution toward the daily adequate intake of 550 mg for men and 425 mg for women. Most people in the U.S. don’t get enough choline from their diet, making steak a useful source.
Choline supports cell membrane structure, brain signaling, and liver function. Your body can make small amounts on its own, but not nearly enough to meet its needs. Eggs and liver are among the few foods that beat steak for choline content.
Fat-Soluble Vitamins: A and E
Steak isn’t typically a major source of vitamins A or E, but grass-fed beef changes the picture. Cattle raised on pasture accumulate carotenoids (precursors to vitamin A) and vitamin E from the grasses they eat. Grain-fed beef contains measurably lower levels of both. The yellow-tinted fat you sometimes see on grass-fed cuts is a visual marker of those carotenoids.
Vitamin E acts as an antioxidant, protecting cell membranes from damage. Vitamin A supports vision, immune function, and skin health. If maximizing fat-soluble vitamins matters to you, grass-finished beef is the better choice.
How Vitamin Levels Vary by Cut
Not all steaks are nutritionally identical. The cut you choose affects your vitamin intake more than most people realize. Chuck cuts like the top blade steak pack the most B12 (6.2 mcg per 100 g) and riboflavin (0.38 mg), likely because these heavily worked muscles store more of certain nutrients. The tradeoff is lower niacin: only 4.1 mg compared to 8.6 mg in a tenderloin or strip steak.
Loin cuts like the strip steak and tenderloin are strong across the board for niacin and B6 but carry less B12, typically 1.4 to 1.8 mcg per 100 grams. Round cuts like bottom round split the difference, offering solid B6 (0.66 mg) and B12 (4.4 mcg) alongside respectable niacin levels.
If you’re choosing a steak specifically for its vitamin content, the practical takeaway is that tougher, more affordable cuts from the chuck and round often deliver more B12 than premium loin cuts.
How Cooking Affects Vitamin Content
Cooking reduces the vitamin content of any meat, and B vitamins are especially vulnerable because they’re water-soluble and break down with heat. Thiamine (B1), which is present in steak in small amounts, is the most fragile. Studies on meat cooking show thiamine losses ranging from 73 percent up to a complete loss depending on the method. Riboflavin holds up somewhat better, retaining anywhere from 20 to 58 percent of its original content after cooking.
The key factors are time, temperature, and how much liquid is involved. Quick, high-heat methods like pan-searing and grilling expose the meat to less prolonged heat than braising or stewing, which means better vitamin retention overall. Cooking in liquid draws water-soluble vitamins out of the meat and into the surrounding liquid, so if you’re braising a steak, consuming the sauce or broth recaptures some of those lost nutrients.
B12 is relatively heat-stable compared to other B vitamins, so the amounts listed in USDA data for cooked steak already reflect what survives the cooking process. The numbers above are what you actually get on your plate, not raw values.
What Steak Doesn’t Provide
Steak is not a meaningful source of vitamin C, vitamin D, or folate. Vitamin C is found almost exclusively in fruits and vegetables. Vitamin D comes primarily from sunlight exposure, fatty fish, and fortified foods. Folate is concentrated in leafy greens, legumes, and fortified grains. A steak dinner paired with a salad and some roasted vegetables fills those gaps naturally, which is why nutritional balance across the whole plate matters more than any single food.