Purported Benefits, Side Effects & More


Purported Benefits, Side Effects & More

Common Names

  • O3FAs
  • ω-3 fatty acids
  • n-3 fatty acids

For Patients & Caregivers

Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.

What is it?

Omega-3, also called omega-3 fatty acids, mainly comes from fish oil, such as krill oil and cod liver oil. It’s also found in foods like flaxseed, linseed oil, walnuts, and chia seeds.

What are the potential uses and benefits?

Omega-3 may be useful for:

  • Reducing fatty deposits on the inside of your arteries
  • Preventing heart disease
  • Managing depression
  • Lowering cholesterol levels
  • Preventing cancer
  • Treating symptoms of lupus (an autoimmune disease)

Omega-3 also has other uses that haven’t been studied by doctors to see if they work.

It’s generally safe to have omega-3 in your diet. Talk with your healthcare providers before taking supplements. They can interact with some medications and affect how they work. For more information, read the “What else do I need to know?” section below.

What are the side effects?

Side effects of using omega-3 may include:

  • A fishy taste in your mouth
  • Diarrhea (loose or watery bowel movements)
  • Nausea (feeling like you’re going to throw up)
What else do I need to know?
  • Omega-3 fatty acids and omega-6 fatty acids are not the same. Omega-6 is found in evening primrose oil and borage oil, and has different effects on the body.
  • Don’t take omega-3 if you’re taking blood thinners such as aspirin, heparin, warfarin (Coumadin®, Jantoven®), clopidogrel (Plavix®), apixaban (Eliquis®), or rivaroxaban (Xarelto®). There are others, so be sure to talk to your healthcare provider before taking omega-3. Omega-3 can increase your risk of bleeding.
  • Don’t take omega-3 if you’re taking glucocorticoids, such as cortisone, hydrocortisone or dexamethasone. Omega-3 supplements can worsen some side effects caused by glucocorticoids.

For Healthcare Professionals

Brand Name
Omegaven®, Max-EPA
Clinical Summary

A type of polyunsaturated fatty acid (PUFA) derived mainly from fish oil, omega-3 fatty acids are used as dietary supplements for depression, to lower cholesterol, and to reduce the risk of heart attack. 

A large survey of Finnish adults found that depressive symptoms were significantly higher among infrequent fish consumers (1) and in other studies individuals with major depression had marked depletions in omega-3 (2). Supplementation, however, did not prevent depression (77), relieve depression in adults with major depression (3), including those with or at risk of coronary heart disease (65), with mild to moderate depression (4), with perinatal depression (5); or in obese or overweight adults with subsyndromal depressive symptoms (66), and yielded mixed results in those with schizophrenia (23)

In young adults at risk for psychotic conditions, supplementation reduced the risk of progression to psychiatric disorders and was a safe preventive measure in young adults (35) although conflicting data show no benefit against major depressive disorder (84).

Supplementation in pregnant women did not lower the incidence of early preterm delivery, nor the higher incidence of interventions in post-term deliveries (67), and did not improve cognitive or language outcomes in early childhood  (37), or intelligence (42). But DHA was shown to improve learning and memory function in age-related cognitive decline (41) although a large, long-term study of omega-3 with or without multidomain lifestyle interventions of physical activity, cognitive training, and nutritional advice failed to find significant effects on cognitive decline in elderly adults with memory complaints (52).
Studies are mixed on the effects of supplementation on incidence or progression of age-related macular degeneration (73) (85).

Omega-3 lowers cholesterol (8) (33) and may reduce recurrence in patients with a history of stroke (32). In individuals with cardiovascular risk factors, supplementation improved cardiometabolic profiles (53), but did not prevent incident atrial fibrillation (78) nor lower the risk of cardiovascular disease events (9) (72) although a meta analysis reported that protective effects of EPA and DHA increase with dosage (79). Omega-3 may also help patients with ulcerative colitis (10), but was ineffective in the treatment of Crohn’s disease (13). In adults with rheumatoid arthritis, supplementation led to reductions in NSAID use (14) and in NSAID-associated gastroduodenal damage (47). It may also lower the magnitude of the body’s inflammatory response (18), and can reduce sensitivity to sunburn (20) and to ultraviolet radiation (44). Reviews indicate possible benefits for patients with cystic fibrosis (21), but not in those with asthma (22)

Fish oil may help reduce the symptoms of systemic lupus erythematosus (24). Another large trial also reported benefit, with or without vitamin D, in reducing the risk of autoimmune disease (80).

In type 1 diabetic patients, long-term supplementation had positive effects on neuropathy, measured by increases in corneal nerve fiber length (54). But there was no significant benefit in patients with dry eye disease (60). A systematic review determined benefits of omega-3 on insulin sensitivity and adipocyte function (45). However, high-dose supplementation did not improve features associated with metabolic syndrome such as adipose tissue lipolysis or inflammation in insulin-resistant adults (55). In another trial, DHA was found more effective compared to eicosapentanoic acid (EPA) in modulating indicators of inflammation and blood lipids (50). In women with gestational diabetes, omega-3 and vitamin E improved some markers of inflammation and oxidative stress as well as incidence of newborn hyperbilirubinemia (56). In hemodialysis patients, omega-3 significantly reduced serum creatinine (57), but did not reduce arteriovenous fistula failure (58).

Data on omega-3 for cancer prevention are inconclusive. It may reduce colon cancer risk (11); improve immune response in patients undergoing colorectal cancer resection (12); and reduce the incidence and severity of oxaliplatin-related neurotoxicity (74) but did not affect cancer outcomes (15) (43). Also, perioperative use of intravenous omega-3 resulted in infectious complications in patients undergoing elective colon resection for non-metastasized cancer (68). Conflicting data suggest beneficial association between higher omega-3 intake and improved survival among stage III colon cancer patients with wild-type KRAS and deficient MMR (69); supplementation also reduced occurrence of renal cell carcinoma in women (16). Furthermore, fish oil may lower the risk of breast cancer (36); improve overall survival (70) and xerostomia, but not toxicity (71) associated with neoadjuvant chemotherapy in patients with locally advanced breast cancer. Data from the Selenium and Vitamin E Cancer Prevention Trial (SELECT) showed high blood levels of omega-3 to be associated with increased risk of prostate cancer (17). In patients with sporadic colorectal neoplasia, EPA did not affect reductions in the proportion of patients with at least one colorectal adenoma when compared to aspirin or placebo (61). Also, in the prevention trial VITAL, supplementation did not lower incidence of invasive cancer or major cardiovascular events compared to placebo (62) although updated analyses show significant reduction in cancer mortality (75).

Preliminary findings suggest that fish oil increases efficacy of chemotherapy, improves survival (38), and helps maintain weight and muscle mass (39) in patients with non-small cell lung cancer (NSCLC); and improves quality of life scores in gastrointestinal cancer patients  (81). But conflicting data suggest otherwise (59)  (82) although a positive correlation was reported between adherence to supplementation and the ability to reduce weight loss during radiotherapy (83). Additional studies found an EPA-enriched oral supplement improved tolerability of chemotherapy in advanced colorectal cancer patients (40); and when combined with chemotherapy, fish oil supplements may delay tumor progression in those with colorectal cancer (49). Omega-3 may also have a protective effect on the olfactory system in patients following endoscopic resection of sellar and parasellar masses (76).

Food Sources
  • Fish Oil
  • Krill Oil
  • Cod Liver Oil
  • Flaxseed Oil
  • Linseed Oil
  • Walnuts
  • Chia seeds
Purported Uses and Benefits
  • Atherosclerosis
  • Cardiovascular disease
  • Depression
  • High cholesterol
  • Cancer prevention
  • Lupus symptoms
Mechanism of Action

Omega-3 fatty acids are polyunsaturated fatty acids containing two or more double bonds in their acyl chain and a double bond on carbon number (3) (26). Changes in omega-3 fatty acid blood levels have been associated with cardiovascular disease and depression (27). The cardioprotective effects of omega-3 fatty acids likely are due its ability to be incorporated into and thereby enhance the stability of atherosclerotic plaques (26). Increasing the intake of polyunsaturated fatty acids has been shown to increase lipid peroxidation. Supplementation with omega-3 fatty acids, therefore, may increase oxidative stress on the body. Studies have shown that mucosal alpha-tocopherol levels decrease upon omega-3 fatty acid supplementation, which researchers believe may result from the body’s attempt to counteract the added oxidative burden (11). Besides reducing serum antioxidant levels, little is known about how this added oxidative stress affects the body.

Omega-3 fatty acid supplementation has been shown to decrease IL-6 (18) and tumor necrosis factor-alpha (28) levels while leaving most other mononuclear cell functions unaffected (29). Omega-3 fatty acids may also reduce inflammation in patients with ulcerative colitis by reducing rectal dialysate leukotriene B4 (10). Because of their anti-inflammatory effects, omega-3 fatty acids were thought to benefit patients with asthma (22) and cystic fibrosis (21), but data are inconclusive.

Increasing PUFA intake in pregnant women increases PUFA concentration but not cytokine concentration in human milk (30). Omega-3 fatty acid supplementation provides protection against ultra-violet radiation-induced erythema and p53 expression, a biomarker of DNA damage (20).

Adverse Reactions
  • Fishy aftertaste (11), loose stools and nausea (31) have been reported following intake of large doses of omega-3 fatty acids.
  • Gastrointestinal events (diarrhea, nausea, and abdominal pain), and atrial fibrillation have been reported with EPA intake in a clinical study (61).
Herb-Drug Interactions
  • Warfarin: Elevated INR was reported following use of fish oil supplements (2 g/day). INR decreased after reducing supplement intake (34).
    High dose omega-3 supplements have been associated with subdural hematoma [6g/day] requiring craniotomy (63);
    Irreversible warfarin-induced coagulopathy was reported following blunt head trauma (64).
  • Glucocorticoids: Omega-3 supplements potentiated some adverse effects of glucocorticoids in a murine model. Clinical relevance is not known (46)
  • Pazopanib: Concurrent use of an oral nutritional supplement enriched with omega-3 fatty acids has been associated with stomatitis/oral mucositis in a patient with metastatic clear cell renal cancer (86).
Herb Lab Interactions
  • In a study of heart transplant recipients, omega-3 supplementation decreased vitamin E and beta-carotene levels while increasing TNF-alpha (28).
  • A meta-analysis found high levels of omega-3s to help reduce triglycerides, and to increase LDL cholesterol (9).
  • Doses higher than 3 grams per day may increase bleeding time (25).
Dosage (OneMSK Only)
  1. Tanskanen A, Hibbeln JR, Tuomilehto J, Uutela A, Haukkala A, Viinamaki H et al. Fish consumption and depressive symptoms in the general population in Finland. Psychiatr.Serv. 2001;52:529-31.
  2. Mischoulon D,.Fava M. Docosahexanoic acid and omega-3 fatty acids in depression. Psychiatr. Clin North Am 2000;23:785-94.
  3. Grenyer BF, Crowe T, Meyer B, et al. Fish oil supplementation in the treatment of major depression: a randomised double-blind placebo-controlled trial. Prog Neuropsychopharmacol Biol Psychiatry 2007 Oct 1;31(7):1393-6.
  4. Rogers PJ, Appleton KM, Kessler D, et al. No effect of n-3 long-chain polyunsaturated fatty acid (EPA and DHA) supplementation on depressed mood and cognitive function: a randomised controlled trial. Br J Nutr. 2008 Feb;99(2):421-31.
  5. Rees AM, Austin MP, Parker GB. Omega-3 fatty acids as a treatment for perinatal depression: randomized double-blind placebo-controlled trial. Aust N Z J Psychiatry. 2008 Mar;42(3):199-205
  6. Ryan AS, Nelson EB. Assessing the effect of docosahexaenoic acid on cognitive functions in healthy, preschool children: a randomized, placebo-controlled, double-blind study. Clin Pediatr (Phila) 2008 May;47(4):355-62.
  7. van de Rest O, Geleijnse JM, Kok FJ, et al. Effect of fish oil on cognitive performance in older subjects: a randomized, controlled trial. Neurology 2008 Aug 5;71(6):430-8.
  8. Kabir M, Skurnik G, Naour N, et al. Treatment for 2 mo with n 3 polyunsaturated fatty acids reduces adiposity and some atherogenic factors but does not improve insulin sensitivity in women with type 2 diabetes: a randomized controlled study. Am J Clin Nutr 2007 Dec;86(6):1670-9.
  9. Rizos E, Ntzani E, Bika E, et al. Association Between Omega-3 Fatty Acid Supplementation and Risk of Major Cardiovascular Disease Events: A Systematic Review and Meta-analysis. JAMA. 2012;308(10):1024-1033.
  10. Stenson WF, Cort D, Rodgers J, Burakoff R, DeSchryver-Kecskemeti K, Gramlich TL et al. Dietary supplementation with fish oil in ulcerative colitis. Ann.Intern.Med 1992;116:609-14.
  11. Anti M, Armelao F, Marra G, Percesepe A, Bartoli GM, Palozza P et al. Effects of different doses of fish oil on rectal cell proliferation in patients with sporadic colonic adenomas. Gastroenterology 1994;107:1709-18.
  12. Liang B, Wang S, Ye YJ, et al. Impact of postoperative omega-3 fatty acid-supplemented parenteral nutrition on clinical outcomes and immunomodulations in colorectal cancer patients. World J Gastroenterol. 2008;14(15):2434-9
  13. Feagan BG, Sandborn WJ, Mittmann U, et al. Omega-3 free fatty acids for the maintenance of remission in Crohn disease: the EPIC Randomized Controlled Trials. JAMA 2008 Apr 9;299(14):1690-7.
  14. Galarraga B, Ho M, Youssef HM, et al. Cod liver oil (n-3 fatty acids) as an non-steroidal anti-inflammatory drug sparing agent in rheumatoid arthritis. Rheumatology (Oxford) 2008 May;47(5):665-9.
  15. MacLean CH, et al. Effects of Omega-3 Fatty Acids on Cancer Risk. JAMA 2006; 295(4).
  16. Wolk A, Larsson SC, Johansson J, Ekman P. Long-term fatty fish consumption and renal cell carcinoma incidence in women. JAMA 2006;296(11):1371-1376.
  17. Brasky TM, Darke AK, Song X, et al. Plasma Phospholipid Fatty Acids and Prostate Cancer Risk in the SELECT Trial. J Natl Cancer Inst. 2013 Aug 7;105(15):1132-41.
  18. Weiss G, Meyer F, Matthies B, Pross M, Koenig W, Lippert H. Immunomodulation by perioperative administration of n-3 fatty acids. Br J Nutr 2002;87 Suppl 1:S89-S94.
  19. Heller AR, Fischer S, Rossel T, Geiger S, Siegert G, Ragaller M et al. Impact of n-3 fatty acid supplemented parenteral nutrition on haemostasis patterns after major abdominal surgery. Br J Nutr 2002;87 Suppl 1:S95-101.
  20. Rhodes LE, Shahbakhti H, Azurdia RM, Moison RM, Steenwinkel MJ, Homburg MI et al. Effect of eicosapentaenoic acid, an omega-3 polyunsaturated fatty acid, on UVR-related cancer risk in humans. An assessment of early genotoxic markers. Carcinogenesis 2003;24:919-25.
  21. Beckles WN, Elliott TM, Everard ML. Omega-3 fatty acids (from fish oils) for cystic fibrosis. Cochrane.Database.Syst.Rev. 2002;CD002201.
  22. Woods RK, Thien FC, Abramson MJ. Dietary marine fatty acids (fish oil) for asthma in adults and children. Cochrane.Database.Syst.Rev. 2002;CD001283.
  23. Joy CB, Mumby-Croft R, Joy LA. Polyunsaturated fatty acid supplementation for schizophrenia. Cochrane.Database.Syst.Rev. 2003;CD001257.
  24. Duffy EM, et al. The Clinical effect of dietary supplementation with omega-3 fish oils and/or copper in systemic lupus erythematosus. J. Rheumatology 2004;31(8):1551-6.
  25. Lewis, C. J. Letter Regarding Dietary Supplement Health Claim for Omega-3 Fatty Acids and Coronary Heart Disease. FDA Docket No. 91N-0103. 10-31-2000. Accessed April 29, 2020.
  26. Thies F, Garry JM, Yaqoob P, Rerkasem K, Williams J, Shearman CP et al. Association of n-3 polyunsaturated fatty acids with stability of atherosclerotic plaques: a randomised controlled trial. Lancet 2003;361:477-85.
  27. Severus WE, Littman AB, Stoll AL. Omega-3 fatty acids, homocysteine, and the increased risk of cardiovascular mortality in major depressive disorder. Harv.Rev.Psychiatry 2001;9:280-93.
  28. Holm T, Berge RK, Andreassen AK, Ueland T, Kjekshus J, Simonsen S et al. Omega-3 fatty acids enhance tumor necrosis factor-alpha levels in heart transplant recipients. Transplantation 2001;72:706-11.
  29. Wallace FA, Miles EA, Calder PC. Comparison of the effects of linseed oil and different doses of fish oil on mononuclear cell function in healthy human subjects. Br J Nutr 2003;89:679-89.
  30. Hawkes JS, Bryan DL, Makrides M, Neumann MA, Gibson RA. A randomized trial of supplementation with docosahexaenoic acid-rich tuna oil and its effects on the human milk cytokines interleukin 1 beta, interleukin 6, and tumor necrosis factor alpha. Am J Clin Nutr 2002;75:754-60.
  31. Fugh-Berman A, Cott JM. Dietary supplements and natural products as psychotherapeutic agents. Psychosom.Med 1999;61:712-28.
  32. Tanaka K, Ishikawa Y, Yokoyama M, et al. Reduction in the recurrence of stroke by eicosapentaenoic acid for hypercholesterolemic patients: subanalysis of the JELIS trial. Stroke. 2008 Jul;39(7):2052-8.
  33. Gunnarsdottir I, Tomasson H, Kiely M, et al. Inclusion of fish or fish oil in weight-loss diets for young adults: effects on blood lipids. Int J Obes. 2008;32(7):1105-12.
  34. Buckley MS, Goff AD, Knapp WE. Fish oil interaction with warfarin. Ann Pharmacother. 2004 Jan;38(1):50-2.
  35. Amminger GP, Schäfer MR, Papageorgiou K, et al. Long-Chain {omega}-3 Fatty Acids for Indicated Prevention of Psychotic Disorders: A Randomized, Placebo-Controlled Trial. Arch Gen Psychiatry. 2010 Feb;67(2):146-54.
  36. Brasky TM, Lampe JW, Potter JD, Patterson RE, White E. Specialty Supplements and Breast Cancer Risk in the VITamins And Lifestyle (VITAL) Cohort. Cancer Epidemiol Biomarkers Prev. 2010;19(7); 1696-708.
  37. Makrides M, Gibson R,McPhee A, et al. Effect of DHA Supplementation During Pregnancy on Maternal Depression and Neurodevelopment of Young Children. A Randomized Controlled Trial. JAMA. 2010;304(15):1675-1683.
  38. Murphy RA, Mourtzakis M, Chu QS, et al. Supplementation with fish oil increases first-line chemotherapy efficacy in patients with advanced nonsmall cell lung cancer. Cancer. 2011;117(16):3774-80.
  39. Murphy RA, Mourtzakis M, Chu QS, et al. Nutritional intervention with fish oil provides a benefit over standard of care for weight and skeletal muscle mass in patients with nonsmall cell lung cancer receiving chemotherapy. Cancer. 2011 Apr 15;117(8):1775-82.
  40. Trabal J, Leyes P, Forga M, Maurel J. Potential usefulness of an EPA-enriched nutritional supplement on chemotherapy tolerability in cancer patients without overt malnutrition. Nutr Hosp. 2010 Sep-Oct;25(5):736-40.
  41. Sinn N, Milte CM, Street SJ, et al. Br J Nutr. Effects of n-3 fatty acids, EPA v. DHA, on depressive symptoms, quality of life, memory and executive function in older adults with mild cognitive impairment: a 6-month randomised controlled trial. Br J Nutr. 2011 Sep 20:1-12.
  42. Campoy C, Escolano-Margarit MV, Ramos R, et la. Effects of prenatal fish-oil and 5-methyltetrahydrofolate supplementation on cognitive development of children at 6.5 y of age. Am J Clin Nutr. 2011; 94(6 Suppl):1880S-1888S.
  43. Andreeva VA, Touvier M, Kesse-Guyot E, Julia C, Galan P, Hercberg S. B vitamin and/or ω-3 fatty acid supplementation and cancer: ancillary findings from the supplementation with folate, vitamins B6 and B12, and/or omega-3 fatty acids (SU.FOL.OM3) randomized trial. Arch Intern Med 2012 Apr 9;172(7):540-7.
  44. Pilkington SM, Massey KA, Bennett SP, et al. Randomized controlled trial of oral omega-3 PUFA in solar-simulated radiation-induced suppression of human cutaneous immune responses. Am J Clin Nutr. 2013 Mar;97(3):646-52.
  45. Wu JH, Cahill LE, Mozaffarian D. Effect of Fish Oil on Circulating Adiponectin: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Clin Endocrinol Metab. 2013 Jun;98(6):2451-9.
  46. Fappi A, Godoy TS, Maximino JR, et al. The effects of omega-3 Fatty Acid supplementation on dexamethasone-induced muscle atrophy. Biomed Res Int. 2014;2014:961438.
  47. Park JM, Han YM, Jeong M, et al. Omega-3 polyunsaturated acids as an angelus custos to rescue patients from NSAID-induced gastroduodenal damage. J Gastroenterol. 2015 Jan 13. [Epub ahead of print]
  48. Daenen L, Geert A. Cirkel G, Houthuijzen M, et al. Increased Plasma Levels of Chemoresistance-Inducing Fatty Acid 16:4(n-3) After Consumption of Fish and Fish Oil. JAMA Oncol. 2015 Jun;1(3):350-8.
  49. Camargo Cde Q, Mocellin MC, Pastore Silva Jde A, Fabre ME, Nunes EA, Trindade EB. Fish oil supplementation during chemotherapy increases posterior time to tumor progression in colorectal cancer. Nutr Cancer. 2016;68(1):70-6.
  50. Allaire J, Couture P, Leclerc M, et al. A randomized, crossover, head-to-head comparison of eicosapentaenoic acid and docosahexaenoic acid supplementation to reduce inflammation markers in men and women: the Comparing EPA to DHA (ComparED) Study. Am J Clin Nutr.2016 Aug;104(2):280-7.
  51. Pryce R, Bernaitis N, Davey AK, Badrick T, Anoopkumar-Dukie S. The Use of Fish Oil with Warfarin Does Not Significantly Affect either the International Normalised Ratio or Incidence of Adverse Events in Patients with Atrial Fibrillation and Deep Vein Thrombosis: A Retrospective Study. Nutrients.2016 Sep 20;8(9). pii: E578.
  52. Andrieu S, Guyonnet S, Coley N, et al. Effect of long-term omega 3 polyunsaturated fatty acid supplementation with or without multidomain intervention on cognitive function in elderly adults with memory complaints (MAPT): a randomised, placebo-controlled trial. Lancet Neurol. May 2017;16(5):377-389.
  53. Barbosa MM, Melo AL, Damasceno NR. The benefits of omega-3 supplementation depend on adiponectin basal level and adiponectin increase after the supplementation: A randomized clinical trial. Nutrition. Feb 2017;34:7-13.
  54. Lewis EJH, Perkins BA, Lovblom LE, et al. Effect of omega-3 supplementation on neuropathy in type 1 diabetes: A 12-month pilot trial. Neurology. Jun 13 2017;88(24):2294-2301.
  55. Hames KC, Morgan-Bathke M, Harteneck DA, et al. Very-long-chain omega-3 fatty acid supplements and adipose tissue functions: a randomized controlled trial. Am J Clin Nutr. Jun 2017;105(6):1552-1558.
  56. Jamilian M, Hashemi Dizaji S, Bahmani F, et al. A Randomized Controlled Clinical Trial Investigating the Effects of Omega-3 Fatty Acids and Vitamin E Co-Supplementation on Biomarkers of Oxidative Stress, Inflammation and Pregnancy Outcomes in Gestational Diabetes. Can J Diabetes. Apr 2017;41(2):143-149.
  57. Jabbari M, Khoshnevis T, Jenabi A, et al. The Effect of Omega-3 Supplement on Serum Lipid Profile in Patients Undergoing Hemodialysis: A Randomized Clinical Trial. Rom J Intern Med. Dec 01 2016;54(4):222-227.
  58. Irish AB, Viecelli AK, Hawley CM, et al. Effect of Fish Oil Supplementation and Aspirin Use on Arteriovenous Fistula Failure in Patients Requiring Hemodialysis: A Randomized Clinical Trial. JAMA Intern Med. Feb 01 2017;177(2):184-193.
  59. Ida S, Hiki N, Cho H, et al. Randomized clinical trial comparing standard diet with perioperative oral immunonutrition in total gastrectomy for gastric cancer. Br J Surg. Mar 2017;104(4):377-383.
  60. Dry Eye Assessment and Management Study Research Group. n-3 Fatty Acid Supplementation for the Treatment of Dry Eye Disease. N Engl J Med. 2018 Apr 13. doi: 10.1056/NEJMoa1709691. [Epub ahead of print]
  61. Hull MA, Sprange K, Hepburn T, et al. Eicosapentaenoic acid and aspirin, alone and in combination, for the prevention of colorectal adenomas (seAFOod Polyp Prevention trial): a multicentre, randomised, double-blind, placebo-controlled, 2 × 2 factorial trial. Lancet. 2018 Dec 15;392(10164):2583-2594.
  62. Manson JE, Cook NR, Lee IM, et al. Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer. N Engl J Med. 2019 Jan 3;380(1):23-32.
  63. McClaskey EM, Michalets EL. Subdural hematoma after a fall in an elderly patient taking high-dose omega-3 fatty acids with warfarin and aspirin: case report and review of the literature. Pharmacotherapy. 2007 Jan;27(1):152-60.
  64. Gross BW, Gillio M, Rinehart CD, Lynch CA, Rogers FB. Omega-3 Fatty Acid Supplementation and Warfarin: A Lethal Combination in Traumatic Brain Injury. J Trauma Nurs. 2017 Jan/Feb;24(1):15-18.
  65. Carney RM, Freedland KE, Rubin EH, Rich MW, Steinmeyer BC, Harris WS. A Randomized Placebo-Controlled Trial of Omega-3 and Sertraline in Depressed Patients With or at Risk for Coronary Heart Disease. J Clin Psychiatry. 2019 Jun 4;80(4). pii: 19m12742.
  66. Bot M, Brouwer IA, Roca, et al. Effect of Multinutrient Supplementation and Food-Related Behavioral Activation Therapy on Prevention of Major Depressive Disorder Among Overweight or Obese Adults With Subsyndromal Depressive Symptoms: The MooDFOOD Randomized Clinical Trial. JAMA. 2019 Mar 5;321(9):858-868.
  67. Makrides M, Best K, Yelland L, et al. A Randomized Trial of Prenatal n-3 Fatty Acid Supplementation and Preterm Delivery. N Engl J Med. 2019 Sep 12;381(11):1035-1045.
  68. Bakker N, van den Helder RS, Stoutjesdijk E, van Pelt J, Houdijk APJ. Effects of perioperative intravenous ω-3 fatty acids in colon cancer patients: a randomized, double-blind, placebo-controlled clinical trial. Am J Clin Nutr. 2020 Feb 1;111(2):385-395.
  69. Song M, Ou FS, Zemla TJ, et al. Marine omega-3 fatty acid intake and survival of stage III colon cancer according to tumor molecular markers in NCCTG Phase III trial N0147 (Alliance). Int J Cancer. 2019 Jul 15;145(2):380-389.
  70. Darwito D, Dharmana E, Riwanto I, et al. Effects of Omega-3 Supplementation on Ki-67 and VEGF Expression Levels and Clinical Outcomes of Locally Advanced Breast Cancer Patients Treated with Neoadjuvant CAF Chemotherapy: A Randomized Controlled Trial Report. Asian Pac J Cancer Prev. 2019 Mar 26;20(3):911-916.
  71. de la Rosa Oliva F, Meneses García A, Ruiz Calzada H, et al. Effects of omega-3 fatty acids supplementation on neoadjuvant chemotherapy-induced toxicity in patients with locally advanced breast cancer: a randomized, controlled, double-blinded clinical trial. Nutr Hosp. 2019 Aug 26;36(4):769-776.
  72. Nicholls SJ, Lincoff AM, Garcia M, et al. Effect of High-Dose Omega-3 Fatty Acids vs Corn Oil on Major Adverse Cardiovascular Events in Patients at High Cardiovascular Risk: The STRENGTH Randomized Clinical Trial. JAMA. 2020 Nov 15:e2022258. Online ahead of print
  73. Christen WG, Cook NR, Manson JE, et al. Effect of Vitamin D and ω-3 Fatty Acid Supplementation on Risk of Age-Related Macular Degeneration: An Ancillary Study of the VITAL Randomized Clinical Trial. JAMA Ophthalmol. 2020 Dec 1;138(12):1280-1289.
  74. Zhang X, Chen H, Lu Y, et al. Prevention of oxaliplatin-related neurotoxicity by ω-3 PUFAs: A double-blind randomized study of patients receiving oxaliplatin combined with capecitabine for colon cancer. Medicine (Baltimore). 2020 Dec 11;99(50):e23564.
  75. Manson JE, Bassuk SS, Buring JE; VITAL Research Group. Principal results of the VITamin D and OmegA-3 TriaL (VITAL) and updated meta-analyses of relevant vitamin D trials. J Steroid Biochem Mol Biol. 2020 Apr;198:105522.
  76. Yan CH, Rathor A, Krook K, et al. Effect of Omega-3 Supplementation in Patients With Smell Dysfunction Following Endoscopic Sellar and Parasellar Tumor Resection: A Multicenter Prospective Randomized Controlled Trial.  Neurosurgery. 2020 Aug 1;87(2):E91-E98.
  77. Okereke OI, Vyas CM, Mischoulon D, et al. Effect of Long-term Supplementation With Marine Omega-3 Fatty Acids vs Placebo on Risk of Depression or Clinically Relevant Depressive Symptoms and on Change in Mood Scores: A Randomized Clinical Trial. JAMA. 2021 Dec 21;326(23):2385-2394.
  78. Albert CM, Cook NR, Pester J, et al. Effect of Marine Omega-3 Fatty Acid and Vitamin D Supplementation on Incident Atrial Fibrillation: A Randomized Clinical Trial. JAMA. 2021 Mar 16;325(11):1061-1073.
  79. Bernasconi AA, Wiest MM, Lavie CJ, Milani RV, Laukkanen JA. Effect of Omega-3 Dosage on Cardiovascular Outcomes: An Updated Meta-Analysis and Meta-Regression of Interventional Trials. Mayo Clin Proc. 2021 Feb;96(2):304-313.
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