Halibut: Nutrition Facts, Health Benefits, and the Lean Fish With an Unusually Strong Vitamin D Profile

Halibut occupies a genuinely unusual nutritional position among white fish. Most lean, low-fat fish provide very little Vitamin D, since this fat-soluble vitamin is typically concentrated in fattier fish like salmon and mackerel. Halibut breaks that pattern — at just 1.5g of fat and 111 calories per 100g, it still delivers 27% of daily Vitamin D alongside an exceptional 85% of daily selenium, 50% of B12, 39% of B6, and 34% of phosphorus. Combined with 23g of complete, easily digestible protein, it is one of the more nutritionally distinctive lean fish available, and one of the largest flatfish in the ocean, with some specimens growing to several hundred kilograms.

Halibut Nutrition Facts (per 100g, cooked)

Halibut Nutrition Facts (per 159g serving — approximately one standard fillet)

A standard fillet weighs approximately 159g:

A single fillet provides more than a full day’s selenium requirement at under 180 calories.

Vitamins in Halibut (per 100g, cooked)

Standout: Halibut’s Vitamin D content (27% DV per 100g) is genuinely unusual for such a lean fish, since Vitamin D is a fat-soluble nutrient typically found in much higher concentrations in fattier fish. This makes it one of the few lean white fish that contributes meaningfully to Vitamin D intake, a nutrient a large proportion of the population is insufficient in, particularly during winter months. Combined with B12 (50% DV) and B6 (39% DV), halibut delivers a genuinely strong vitamin spread for a 111-calorie food.

Minerals in Halibut (per 100g, cooked)

Standout: Halibut’s selenium content (85% DV per 100g) is among the highest of any lean fish, supporting glutathione peroxidase antioxidant enzyme function and thyroid hormone activation. Phosphorus at 34% DV and potassium at 435mg per 100g round out a strong mineral profile from a fish containing almost no fat.

Halibut’s Unusual Vitamin D Story

This is genuinely worth explaining, because it goes against the typical pattern most people understand about fish and Vitamin D.

Vitamin D is fat-soluble, and the conventional nutritional wisdom is that fattier fish — salmon, mackerel, sardines — are the strongest fish-based Vitamin D sources, while leaner white fish like cod or haddock contribute comparatively little. Halibut doesn’t fit this pattern as neatly: despite containing only 1.5g of fat per 100g, dramatically less than salmon’s roughly 13g, it still provides 27% of daily Vitamin D, a meaningfully stronger contribution than most other lean white fish manage.

The explanation lies in where halibut’s Vitamin D is stored and how it accumulates through the marine food chain, rather than in the muscle fat content of the fillet itself, which is why a fish can be simultaneously very lean and a genuinely useful Vitamin D source. For anyone trying to combine a very low-fat protein choice with meaningful Vitamin D intake from food rather than fattier fish, halibut is one of the more practical options available.

Health Benefits of Halibut

Exceptional Selenium for Antioxidant Defense

At 85% DV per 100g, halibut’s selenium content supports glutathione peroxidase, one of the body’s primary antioxidant enzyme systems that neutralizes hydrogen peroxide and lipid peroxides, protecting cell membranes and DNA from oxidative damage. Selenium is also required for the deiodinase enzymes that convert thyroid hormone T4 into its active T3 form, directly relevant to metabolic rate regulation.

Vitamin D in a Genuinely Lean Food

As detailed above, the 27% DV Vitamin D per 100g is a distinctive strength for such a low-fat fish, supporting calcium absorption, bone mineralization, immune function, and the broader range of cardiometabolic benefits consistently associated with Vitamin D sufficiency.

Strong B12 and B6 for Neurological and Metabolic Health

The 50% DV B12 supports myelin synthesis, red blood cell formation, and homocysteine regulation, while the 39% DV B6 is required for amino acid metabolism and neurotransmitter synthesis — particularly relevant given halibut’s substantial protein content, since B6 is needed to metabolize the protein it’s delivered alongside.

Exceptional Protein-to-Calorie Ratio

At 23g of protein for just 111 calories, halibut offers one of the leanest, most calorie-efficient complete protein sources available from any whole food, providing all 9 essential amino acids with excellent digestibility and minimal fat or calorie burden.

Phosphorus for Bone and Energy Metabolism

At 34% DV per 100g, phosphorus works alongside calcium as a structural bone mineral while also serving as a literal component of ATP, the molecule every cell relies on to store and transfer energy.

Modest but Genuine Omega-3 Contribution

While considerably lower than fattier fish, halibut’s roughly 0.3g of omega-3 per 100g still contributes to overall dietary intake of these anti-inflammatory fatty acids, and its very favorable omega-6 to omega-3 ratio (roughly 15:1 in favor of omega-3, the reverse of what most modern diets typically provide) means what little fat halibut does contain is weighted heavily toward the beneficial side of that balance.

Heart Health Through Multiple Pathways

Selenium protects LDL cholesterol from oxidative damage, a critical step in atherosclerotic plaque formation. B6 and B12 work together to regulate homocysteine, an independent cardiovascular risk factor when elevated. Potassium (9% DV per 100g) counteracts sodium’s blood pressure-raising effects. Very low saturated fat (0.3g per 100g) and modest sodium (60mg per 100g) round out a genuinely heart-healthy profile.

Halibut for Athletes and Active People

A Genuinely Efficient Cutting-Phase Protein

At 23g of protein for 111 calories, halibut competes directly with the leanest whole-food protein sources available, making it a strong choice during fat loss phases where maximizing protein relative to calorie intake is the priority.

Selenium for Exercise Recovery

Intense training increases free radical production and oxidative stress; halibut’s exceptional selenium content supports the glutathione peroxidase activity that helps manage this exercise-induced oxidative load, contributing to the antioxidant defenses that support recovery between sessions.

B Vitamins for Energy Metabolism and Protein Utilization

The combination of niacin, B6, and B12 supports both the cellular energy production pathways that underpin training capacity and the protein metabolism required to make full use of halibut’s own substantial protein content.

Vitamin D for Bone and Immune Resilience During Training

For athletes who train indoors or in lower-sunlight climates and are at elevated risk of Vitamin D insufficiency, halibut’s unusually strong Vitamin D contribution for a lean fish makes it a useful dietary tool alongside other strategies for maintaining adequate levels.

Halibut vs Other Lean White Fish

Halibut stands out clearly for its Vitamin D content, which is notably stronger than every other lean white fish in this comparison, and its selenium figure leads the group as well — a genuinely distinctive combination among fish that are otherwise broadly similar in calorie and protein profile.

A Note on Halibut Size and Sustainability

Atlantic halibut is one of the largest bony fish in the ocean, with mature specimens capable of reaching several hundred kilograms — far larger than most commercially eaten fish. This size, combined with a slow growth rate and late sexual maturity, made Atlantic halibut historically vulnerable to overfishing, and wild Atlantic halibut populations were significantly depleted through the 20th century.

Pacific halibut, a separate but related species, has a considerably better-managed fishery, with catch limits and quotas that have kept the population at healthier levels, and is generally the more sustainable choice where labeling allows you to distinguish between the two. Farmed halibut is also increasingly available and offers another more sustainable alternative to wild Atlantic stock specifically.

For anyone choosing halibut regularly, checking for Pacific origin or a sustainability certification (such as the Marine Stewardship Council label) is a reasonable, practical way to make a more environmentally sound choice without sacrificing the nutritional profile described throughout this page.

How to Cook Halibut

Halibut’s firm, meaty texture and very low fat content mean it can dry out if overcooked, unlike fattier fish that have more built-in moisture buffer.

Pan-searing — a hot pan with a small amount of oil produces a good crust quickly; because halibut is so lean, searing for a shorter time than you might use for salmon helps avoid drying it out.

Baking — gentle baking at a moderate temperature, often with a small amount of butter or oil and lemon, helps compensate for the fish’s natural leanness.

Poaching — a particularly good method for halibut specifically, since the surrounding liquid keeps the lean flesh moist throughout cooking.

Avoid prolonged high heat — given its minimal fat content, halibut moves from perfectly cooked to dry and tough more quickly than fattier fish; checking for doneness slightly earlier than you might with salmon is a sensible habit.

Practical Ways to Include Halibut in Your Diet

Pan-seared with lemon and herbs — a simple preparation that lets the fish’s mild, clean flavor stand on its own, finished with a small amount of butter or olive oil to add moisture and help with fat-soluble nutrient absorption.

Baked with vegetables — halibut fillets baked alongside tomatoes, peppers, or asparagus make a complete, low-effort, high-protein meal.

In fish tacos — halibut’s firm texture holds up well to grilling or pan-frying for tacos, paired with cabbage slaw, avocado, and lime.

Poached in a light broth — particularly effective for keeping the lean fish moist, served alongside vegetables or grains.

Post-workout meal — paired with a carbohydrate source such as rice or sweet potato, halibut provides a lean, complete-protein recovery meal with minimal calorie burden.

Potential Considerations

Mercury content — like most larger, longer-living fish, halibut contains more mercury than smaller fish lower on the food chain, though generally less than top predators like swordfish or shark. Most health authorities still consider halibut safe for regular consumption at typical serving frequencies (around 2 servings per week) for most adults, though pregnant women and young children are often advised to be more mindful of total intake across higher-mercury fish species.

Cost — halibut is typically one of the more expensive white fish options, which may limit how practical it is as a frequent dietary staple compared to cheaper alternatives like cod or tilapia.

Sustainability sourcing — as discussed above, checking for Pacific origin or sustainability certification is worthwhile given the more depleted status of historic Atlantic wild stocks.

Allergies — fish allergy is distinct from shellfish allergy and can cause severe reactions; people with a diagnosed fish allergy must avoid halibut regardless of preparation method.

Texture if overcooked — as discussed, halibut’s low fat content means it dries out and becomes tough more readily than fattier fish if cooked too long.