Black caviar is one of the most nutrient-dense foods you can eat. A single ounce (28 grams) delivers 236% of your daily vitamin B12, over 1,000 mg of omega-3 fatty acids, and a concentrated dose of selenium, iron, and high-quality protein. The trade-off is that it’s also high in sodium and cholesterol, so portion size matters.
What’s in a Serving
A typical serving of black caviar is about 1 ounce (28 grams), roughly two tablespoons. In that small amount, you get around 70 calories, 7 grams of protein, and 5 grams of fat. The nutrient density is where caviar stands apart from most foods. That single ounce covers more than twice your daily need for vitamin B12, a third of your selenium requirement, and nearly a fifth of your daily iron.
Per 100 grams, black caviar from sturgeon species ranges from 235 to 283 calories depending on the variety, with protein content between 24 and 28 grams and fat between 13 and 19 grams. Beluga caviar lands near 273 calories per 100 grams with 24.4 grams of protein and 18.6 grams of fat. Siberian sturgeon caviar is leaner at 235 calories, with 26.8 grams of protein and 13 grams of fat. Carbohydrates are negligible across all varieties, typically 1 to 6 grams per 100 grams.
Omega-3s: The Biggest Health Draw
Black caviar is among the richest food sources of EPA and DHA, the two omega-3 fatty acids your body uses most readily. A single tablespoon (16 grams) contains about 1,046 mg of combined EPA and DHA. That’s more than most people get in a full day, and roughly equivalent to taking a high-strength fish oil capsule.
These omega-3s reduce inflammation, lower triglycerides, and support the flexibility of blood vessel walls. Research on beluga caviar specifically found that the ratio of omega-3 to omega-6 fatty acids is favorable at roughly 2:1 to 3:1, which is the direction most health experts want people to shift their diets. Both wild and farmed sturgeon caviar scored low on atherogenicity and thrombogenicity indexes, meaning their fat profile is unlikely to promote plaque buildup or blood clots. Farmed beluga caviar performed nearly as well as wild on these measures.
DHA, which makes up about 24% of the total fatty acids in sturgeon caviar, is a critical building block for brain cell membranes. Adequate DHA intake throughout life is linked to better cognitive function and may help protect against age-related mental decline. Few foods deliver as much DHA per bite as caviar does.
Vitamin B12 and Selenium
The vitamin B12 content is remarkable. At 236% of the daily value per ounce, caviar outperforms most other whole foods for this nutrient. B12 is essential for nerve function, red blood cell production, and DNA synthesis. People who are older, vegetarian, or have absorption issues are commonly low in B12, and even small servings of caviar can meaningfully boost levels.
Selenium, at 34% of the daily value per ounce, acts as an antioxidant and plays a key role in thyroid function and immune defense. Iron, at 19% of the daily value, comes in the heme form found in animal foods, which your body absorbs more efficiently than the iron in plants or supplements.
Sodium and Cholesterol: The Downsides
Caviar is salt-cured, and it shows. A single tablespoon contains about 240 mg of sodium, roughly 10% of the recommended daily limit. Two tablespoons pushes you to nearly 500 mg from one small appetizer. If you’re managing blood pressure or following a low-sodium diet, this adds up quickly, especially since caviar is often served on salted crackers or blini with other salty accompaniments.
Cholesterol is also high. One ounce delivers about 167 mg, which is more than half of what the older 300 mg daily guideline recommended. Current dietary guidelines are less strict about cholesterol from food, since most people’s blood cholesterol responds more to saturated fat than to dietary cholesterol itself. Caviar is relatively low in saturated fat, so for most healthy people, the cholesterol content is not a major concern in typical serving sizes. But if your doctor has specifically told you to limit dietary cholesterol, it’s worth noting.
Heavy Metals and Safety
Like all seafood, caviar can accumulate heavy metals from the water where sturgeon live. A study analyzing Persian sturgeon caviar found mercury levels of 1.44 mg per kilogram, which exceeded maximum permissible limits for that contaminant. However, the overall health risk index for adults and children remained within safe limits, largely because people eat caviar in such small quantities compared to fish fillets.
The tiny serving sizes that are standard for caviar (15 to 30 grams as an appetizer, rarely more than 50 grams even as a main course) work in your favor here. Eating an ounce of caviar occasionally is very different, from an exposure standpoint, than eating several ounces of a high-mercury fish multiple times a week. Farmed sturgeon caviar, which makes up the majority of what’s commercially available today, generally comes from more controlled environments than wild-caught varieties.
How Much to Eat
Most people eat caviar as a treat rather than a staple, and that pattern actually aligns well with its nutritional profile. At 15 to 30 grams per sitting (about half an ounce to one ounce), you capture the B12, selenium, and omega-3 benefits without taking on excessive sodium. Eating it a few times a month gives you a meaningful nutrient boost. Eating it daily in large quantities would tip the sodium and cholesterol balance in the wrong direction.
If you’re eating caviar specifically for the omega-3s, keep in mind that fatty fish like salmon, mackerel, and sardines deliver comparable amounts of EPA and DHA at a fraction of the cost and with lower sodium. Caviar’s advantage is nutrient concentration per gram and its unusually high B12 content, not that it does something no other food can do.