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Seal: an oil that trims triglycerides a little and leaves LDL alone

Seal oil is the part of the animal most people outside the Arctic will ever meet, and its effect on blood fats is small. In a meta-analysis of 9 randomized trials in 626 people, seal oil supplements lowered triglycerides by 17 mg/dL (95% CI -27 to -7.1; metric: 0.19 mmol/L, -0.30 to -0.08), which the authors rated of modest to trivial clinical importance, with low certainty of evidence. LDL cholesterol did not change significantly, -2.7 mg/dL (95% CI -7.3 to 1.9; metric: -0.07 mmol/L, -0.19 to 0.05). Over 14 months in 120 adults with high cholesterol, 1 tbsp (15 mL) of seal oil a day did not lower cholesterol, and neither did cod-liver oil, in a trial whose control group got no placebo. The meat itself is dense food. Raw bearded seal meat gives 12.9 mg iron and 26.7 g protein per 3.5 oz (100 g) in single USDA records of Alaska Native foods. Dried, it reaches 49.6 mg iron per 3.5 oz (100 g) only because water falls from 69.6 g to 11.6 g. Seal is also where much of the Arctic contaminant load sits. In Greenland, seal muscle, liver, kidney and blubber were the dominant sources of contaminants in the traditional diet. The liver needs the most care. In 5 spotted seals from Alaska, a 3.5 oz (100 g) serving of liver carried about 9 times the adult upper limit for vitamin A raw and about 10 times fried, and EFSA advises women who are planning a pregnancy or are pregnant not to eat liver or offal at all.

Every statement here is tied to a source. The badge says what kind of evidence stands behind it: A is a meta-analysis or systematic review, E is the position of an expert body without its own analysis. How we verify →

The numbers, per 3.5 oz (100 g)

USDA entrykcalProteinFatCarbsFiber
Seal, bearded (Oogruk), meat, dried (Alaska Native)35182.6 g2.3 g0 g0 g
Seal, bearded (Oogruk), meat, dried, in oil (Alaska Native)36735.3 g25.1 g0 g0 g
Seal, bearded (Oogruk), meat, low quadrant, raw (Alaska Native)18623.6 g10.2 g0 g0 g
Seal, bearded (Oogruk), meat, partially dried (Alaska Native)27062.4 g2.31 g0 g— g
Seal, bearded (Oogruk), meat, raw (Alaska Native)11026.7 g0.4 g0 g— g
Seal, ringed, liver (Alaska Native)11618.6 g3.3 g2.9 g— g
Seal, ringed, meat (Alaska Native)14228.4 g3.2 g0 g— g

These are the USDA entries that are seal, not foods made from it; they differ in cut, part, pack or preparation. Linked names have a page with the full profile and per-portion figures.

How much is actually in it

What a real portion looks like

What your body absorbs

What cooking and storage change

What it does to your health

Safety, limits and interactions

What people believe that the data does not support

Who this works differently for

What is still unknown

The bottom line

Single trials of the oil look better than the pooled result. In 48 adults with high triglycerides, 1 g a day of omega-3 from seal oil for 6 weeks cut triglycerides by 14% and systolic pressure by 8 mmHg, a small and short study. In 134 patients in China with fatty liver and high blood lipids, 24 weeks of seal oil omega-3 cleared the fatty liver completely in 19.7% (13 of 66) against 7.35% (5 of 68) on placebo, in one trial whose abstract does not describe blinding. Twenty grams of seal oil a day for 42 days raised EPA in the blood phospholipids of 19 healthy men 4.3-fold, at a dose above the 8 to 9 g Inuit usually eat. For nutrients, ringed seal liver held retinol at levels comparable to market liver in Canadian Inuit communities. A 1978 analysis of Arctic Bay foods, on small numbers of samples, found seal meat similar to beef in protein and fat, with vitamin C present in meaningful amounts only in baby seal liver. The cautions are real. In coastal Chukotka, seals were the main dietary source of every persistent toxic substance measured, and mercury and cadmium were high mostly in organ meats. A single case report describes an Inupiaq boy with moderate anaphylaxis after bearded seal and bowhead whale meat, confirmed by specific IgE, and how common this is remains unknown. From 1947 to 1985 every foodborne botulism outbreak in Alaska occurred among Alaska Natives and was tied to traditional foods, though the abstract does not say which foods, seal included, or how they were prepared, and this page has no card on handling fermented or raw seal foods safely. Among 1,300 Nunavik Inuit, each two extra servings a month of seal liver went with a prevalence ratio of 1.01 to 1.02 for Toxoplasma antibodies, a small association that was clearer in some statistical models than in others. This page has no card on Toxoplasma in pregnancy or on how cooking affects it, so it cannot say how to make raw seal liver or meat safe, and nothing on it shows that raw seal liver or meat is safe to eat in pregnancy. In 117 ringed seals from Nunavut, most livers exceeded the European reference value for cadmium, and muscle did so less often. Pregnancy and childhood carry the clearest limits. EFSA keeps the upper limit for preformed vitamin A at 3,000 micrograms a day for adults, set to prevent birth defects, and it applies to pregnant and breastfeeding women. EFSA estimates that liver or offal eaten once a month or less keeps intake under that limit, but it made that estimate for European liver portions, not marine mammal liver. Health messages in Nunavut in 2012 told women of childbearing age to avoid ringed seal liver because of its mercury and to eat ringed seal meat instead, and that guidance is now under review. Greenland advises pregnant and nursing women and children to be cautious with aged seals. One risk-benefit model for Inuit women in Ulukhaktok put the weekly maximum at about 4.4 oz (125 g) of ringed seal liver or 6.1 oz (172 g) of meat, each with 1 g of blubber, and its authors say it is not a general recommendation. EFSA confirmed in 2026 its tolerable weekly intake for methylmercury of 1.3 micrograms per kg of body weight. A scoping review found that most research on Inuit country food in pregnancy looked at contaminants and few studies at food safety. For the oil, EFSA judged supplemental EPA and DHA up to 5 g a day safe for adults without a rise in bleeding risk, and FDA concluded that up to 5 g a day from supplements is unlikely to cause excessive bleeding, with the risk above 5 g unclear. We found no study of seal oil taken with blood thinners, so anyone on a blood thinner or an antiplatelet drug should talk to a doctor before taking seal oil. In the US, supplements do not go through FDA approval the way medicines do, and the same advice holds for anyone pregnant or with a chronic illness. The label for prescription omega-3 capsules notes that some trials showed prolonged bleeding time, within normal limits.

More from the same food group (lamb, goat, game)

Sources

  1. seal-daily-r5-12 · food composition analysis
    Caribou and seal meats were similar in protein and fat content in comparison with beef. Arctic char was above the average in protein and fat content for fish. Ascorbic acid was present in significant amounts only in baby seal liver.
    J Am Diet Assoc, 1978 · checked 2026-09-28
  2. seal-daily-r5-13 · food composition data
    Seal, bearded (Oogruk), meat, raw (Alaska Native) (FDC 167610, SR Legacy): iron 12.9 mg, protein 26.7 g, fat 0.4 g, water 69.6 g per 100 g · Seal, bearded (Oogruk), meat, dried (Alaska Native) (FDC 168020): iron 49.6 mg, protein 82.6 g, water 11.6 g per 100 g
    USDA FoodData Central, SR Legacy 2018, FDC 167610 and 168020 · checked 2026-09-28
  3. seal-daily-r5-19 · food composition analysis
    In 8 cases, seal tissues exceeded nutrient ULs for a single serving: total fat in rendered blubber (104%), omega-3 PUFA in raw and rendered blubber (511% and 393%, respectively), vitamin A in raw and fried liver (913% and 1050%), and cholesterol in fried liver (162%) and raw and boiled kidney (149% and 240%).
    Int J Circumpolar Health, 2009 · checked 2026-09-29
  4. seal-daily-r5-18 · agency risk characterization
    The Panel considers that the UL for preformed vitamin A is not expected to be exceeded in European populations if consumption of ‘liver, offal and products thereof’ is limited to once per month or less. However, a higher frequency of offal consumption, and/or the consumption of high‐dose supplements, may lead to intakes above the UL (Section 3.5.1 and Sections thereof).
    EFSA NDA Panel, EFSA Journal 2024;22(6):e8814 · checked 2026-09-29
  5. seal-daily-r5-26 · risk-benefit assessment
    In summary, we would advise female Inuit of childbearing age from Ulukhaktok to confine their weekly consumption of marine mammalian tissue to 172 g ringed seal meat or 125 g ringed seal liver if consumed together with 1 g blubber tissue each.
    Front Nutr, 2017 · checked 2026-09-29
  6. seal-daily-r5-05 · randomized controlled trial
    EPA levels in serum phospholipid and NEFA increased by 4.3- and 2.7-fold, respectively, in the seal oil supplemented group.
    Thromb Res, 1999 · checked 2026-09-28
  7. seal-daily-r5-07 · retrospective outbreak review
    All outbreaks occurred in Alaska Natives and were associated with eating traditional Alaska Native foods.
    J Infect Dis, 1988 · checked 2026-09-28
  8. seal-daily-r5-10 · cross-sectional study
    Each increase of two consumptions per month of beluga (PR ranged from 1.01 to 1.03), seal liver (PR ranged from 1.01 to 1.02) and goose (PR ranged from 1.01 to 1.02) were also associated with seropositivity, albeit more clearly in models 2 and 3, while drinking water mainly from natural (PR of 1.47) or municipal (PR = 1.42) sources compared to bottled water, was correlated with seroprevalence, although results were compatible with the null.
    Zoonoses Public Health, 2021 · checked 2026-09-28
  9. seal-daily-r5-02 · randomized controlled trial
    Plasma triglycerides remained unchanged in the placebo group, whilst reductions of 7 and 14% (P < 0.05) were seen in the fish oil and seal oil groups respectively. Systolic blood pressure improved by 8 and 5 mmHg with seal oil and fish oil respectively (P < 0.05).
    Lipids, 2009 · checked 2026-09-28
  10. seal-daily-r5-03 · randomized controlled trial
    After treatment, complete fatty liver regression was observed in 19.70% (13/66) of the patients, and an overall reduction was found in 53.03% (35/66) of the patients in group A. In contrast, in group B, only five patients (7.35%, 5/68) achieved complete fatty liver regression (P=0.04), whereas 24 patients (35.29%, 24/68) had a certain improvement in fatty liver (P=0.04).
    World J Gastroenterol, 2008 · checked 2026-09-28
  11. seal-daily-r5-06 · case report
    A patient with moderate anaphylaxis to bowhead whale and bearded seal meat demonstrated serum specific IgE by means of immunoblot and positive skin prick test results.
    Ann Allergy Asthma Immunol, 2007 · checked 2026-09-28
  12. seal-daily-r5-08 · exposure assessment
    The evaluation of contaminant intake in this study points to seal muscle, seal liver, seal kidney, seal blubber and whale blubber as the dominant contributors of contaminants in the traditional diet.
    Sci Total Environ, 2004 · checked 2026-09-28
  13. seal-daily-r5-20 · agency position
    Based on the data from these studies, we conclude that ingestion of less than or equal to 5 g/day of EPA and DHA from dietary supplements is unlikely to cause excessive bleeding. With little or no data on intakes over 5 g/day, the potential effects on bleeding risk at those levels of intake are less clear.
    FDA, Letter of Enforcement Discretion: EPA and DHA and Reduction of Blood Pressure, June 19, 2019 · checked 2026-09-29
  14. seal-daily-r5-21 · agency risk assessment (UL)
    Long-term supplemental intakes of EPA and DHA combined up to about 5 g/day do not appear to increase the risk of spontaneous bleeding episodes or bleeding complications, or affect glucose homeostasis immune function or lipid peroxidation, provided the oxidative stability of the n-3 LCPUFAs is guaranteed. Supplemental intakes of EPA and DHA combined at doses of 2 6 g/day, and of DHA at doses of 2 4 g/day, induce an increase in LDL-cholesterol concentrations of about 3 % which may not have an adverse effect on cardiovascular disease risk, whereas EPA at doses up to 4 g/day has no significant effect on LDL cholesterol. Supplemental intakes of EPA and DHA combined at doses up to 5 g/day, and supplemental intakes of EPA alone up to 1.8 g/day, do not raise safety concerns for adults.
    EFSA NDA Panel, EFSA Journal 2012;10(7):2815 · checked 2026-09-29
  15. seal-daily-r5-22 · drug label
    Some trials with omega-3-acids demonstrated prolongation of bleeding time. The prolongation of bleeding time reported in these trials has not exceeded normal limits and did not produce clinically significant bleeding episodes.
    DailyMed, Omega-3-acid ethyl esters capsules, set id 034045d6-5308-4701-b97b-8873e053ec17 (label 2023-10-06) · checked 2026-09-29
  16. seal-daily-r5-27 · contaminant survey
    Using recent European reference values for human consumption of food products, most seals of all ages exceeded the value for liver Cd, but many less exceeded the value for muscle Cd. Using the lower Canadian reference value for THg for human consumption of fish products but based on concentrations of MeHg, the more toxic form of Hg, no muscle samples and very few liver samples exceeded this value.
    Chemosphere, 2025 · checked 2026-09-29
  17. seal-daily-r5-01 · meta-analysis of RCTs
    Supplementation of SO resulted in no statistically significant effects on LDL-C (MD -0.07 mmol/L; 95 % CI [-0.19, 0.05]; CoE: Low) and total cholesterol (MD -0.12 mmol/L; 95 % CI [-0.30, 0.06]; CoE: Very low). There were statistically significant results of modest-to-trivial clinical importance on triglycerides (MD -0.19 mmol/L, 95 % CI [-0.30, -0.08]; CoE: Low) and trivial importance on HDL-C (MD 0.07 mmol/L, 95 % CI [0.003, 0.13]; CoE: Very low).
    Prostaglandins Leukot Essent Fatty Acids, 2025 · checked 2026-09-28
  18. seal-daily-r5-04 · randomized controlled trial
    Neither SO nor CLO had any effects on the levels of serum total cholesterol, high-density lipoprotein cholesterol, postprandial triacylglycerol, apolipoproteins Al and B100, lipoprotein (a), monocyte function expressed as monocyte-derived tissue factor expression, and tumor necrosis factor.
    Lipids, 2001 · checked 2026-09-28
  19. seal-daily-r5-11 · dietary survey
    The median retinol content of liver of ringed seal, caribou, and fish were comparable to levels observed in market food liver.
    Can J Public Health, 2004 · checked 2026-09-28
  20. seal-daily-r5-09 · cross-sectional study
    For the Chukotka coastal communities, seals constitute the principal source of the whole suite of PTSs considered.
    Int J Circumpolar Health, 2012 · checked 2026-09-28
  21. seal-daily-r5-14 · cross-sectional study
    Prevalence of ID was highest among women of childbearing age (16-49 years old, 33%) and anemia among adults aged 50 years and older (31%).
    Can J Public Health, 2024 · checked 2026-09-28
  22. seal-daily-r5-16 · agency risk assessment (UL)
    The Panel proposes to retain the UL of 3000 μg RE/day for adults, based on a NOAEL for teratogenicity (Section 3.7.1.1). This UL applies to men and women, including women of child‐bearing age, pregnant and lactating women, and post‐menopausal women.
    EFSA NDA Panel, EFSA Journal 2024;22(6):e8814 · checked 2026-09-29
  23. seal-daily-r5-17 · agency recommendation
    Since both acute and chronic intakes of preformed vitamin A and the timing of consumption by pregnant women (i.e. during embryogenesis) may be critical for teratogenicity (Section 3.6.1), the Panel maintains the general recommendation for women who are planning to become pregnant or who are pregnant not to consume liver, offal or products thereof (SCF, 1992, 2002).
    EFSA NDA Panel, EFSA Journal 2024;22(6):e8814 · checked 2026-09-29
  24. seal-daily-r5-23 · fact sheet, expert body position
    Total intakes of preformed vitamin A that exceed the UL as well as some retinoid medications used as topical therapies (such as isotretinoin, used to treat severe acne, and etretinate, a treatment for severe psoriasis) can cause congenital birth defects [1]. These birth defects can include malformations of the eye, skull, lungs, and heart [14]. Experts advise women who are or might be pregnant and those who are lactating not to take high doses (more than 3,000 mcg RAE [10,000 IU] daily) of vitamin A supplements [1].
    NIH Office of Dietary Supplements, Vitamin A and Carotenoids Fact Sheet for Health Professionals · checked 2026-09-29
  25. seal-daily-r5-24 · review reporting regional health authority advice
    However, they also stated that women of childbearing age should avoid eating ringed seal liver due to its high mercury content and should instead eat ringed seal meat [2,6]. The Government of Nunavut Department of Health is in the process of reviewing guidance related to ringed seal liver and overall mercury levels in country food [24].
    Int J Circumpolar Health, 2024 · checked 2026-09-29
  26. seal-daily-r5-25 · review reporting national dietary advice
    Intake of all traditional foods after reproductive age is not considered a health issue. Pregnant, nursing women and young people/children are advised to be cautious about eating polar bear, toothed whales, seabirds and aged seals.
    Int J Circumpolar Health, 2024 · checked 2026-09-29
  27. seal-daily-r5-28 · agency risk assessment (TWI)
    Consequently, the current EFSA TWI for methylmercury of 1.3 μg/kg bw, expressed as mercury, remains valid.
    EFSA Journal, 2026 · checked 2026-09-29
  28. seal-daily-r5-15 · scoping review
    The majority of the articles focused on environmental contaminants, and one-quarter described nutrient adequacy. Few articles described food security or food safety in pregnancy, and the most utilized quantitative methods.
    Int J Environ Res Public Health, 2021 · checked 2026-09-28

Review. Reviewed on 2026-09-29 for evidence level, dose and population context, and claims a reader could misread. Bioma Learn has no human medical reviewer at this time, and we say so rather than invent one. Methodology. This is information, not medical advice.