Omega-3 Health Benefits Throughout The Body (12 min.)

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Summary: Omega-3 fatty acids are among the most researched nutrients in nutrition science, with growing evidence suggesting they play a supportive role in many aspects of health — from heart and brain function to eye, skin, sleep, and gut health†. While many people don’t get enough omega-3s from their diet, thoughtful food choices and high-quality supplements may help support overall wellness. In this article, we explore the science on omega-3 benefits, review key areas of research, and share expert insight on how these essential fats can fit into a healthy lifestyle.

Omega-3s are one of the most well-researched nutrients on the market, with more than 30,000 published studies exploring their various benefits. Most widely known to provide heart health benefits, research shows omega-3 fatty acids support good health in a wide variety of ways, including brain, eye, sleep, skin and gut health, as well as effectiveness at supporting healthy inflammatory balance†, mood†, and overall cellular health†.

Why Omega-3 Fatty Acids Matter for Whole-Body Health

Both the American Heart Association and the American Psychiatric Association recommend eating fish, particularly fatty fish—such as salmon, mackerel, or albacore tuna—at least 2 servings per week. However, Michael Chapman, MD, Cooper Clinic Preventive Medicine Physician, says many of his patients don’t get enough omega-3 in their diets. “Optimal levels of omega-3 would be 7 to 8 percent and above,” says Dr. Chapman. “Most people who don’t take omega-3 supplements or don’t have an omega-3-rich diet find themselves around 2 to 4 percent.”

Omega-3 and Heart Health: What the Research Shows

Perhaps the most well-known of omega-3’s benefits is on heart health. Diets rich in the omega-3 fatty acids EPA and DHA—as found in oily fish such as salmon, cod, sardines and canned light tuna—or taking omega-3 supplements can support heart health by managing blood pressure, as indicated by a review of clinical research†.

Persons with elevated triglyceride levels may also benefit from omega-3 supplementation. Triglycerides are a type of fat (lipid) found in the blood, and elevated levels are considered a risk factor for cardiovascular disease. “The data on omega-3 as it relates to decreasing triglycerides is very strong†,” says John S. Ho, MD, Cooper Clinic Cardiologist. “I take Cooper Complete Advanced Omega-3 because I have high triglycerides myself. Containing 1400 mg of EPA and DHA and other omega-3 fatty acids in each two-softgel serving, “Cooper Complete Advanced Omega-3 has among the highest levels of EPA and DHA,” explains Ho. “That’s why I recommend it to my patients.”

One of the most significant ongoing studies in recent years, the VITAL study continues to follow 25,871 adults aged 50+ as they supplement 50 mcg (2000 IU) vitamin D and 1 gram of fish oil per day. Nina B. Radford, MD, Cooper Clinic Cardiologist, shares her takeaways from the VITAL study, including the following highlights. Note: These outcomes were evaluated as research endpoints and should not be interpreted as evidence that dietary supplements diagnose, treat, cure, or prevent disease.

• People who consumed less than two servings of fatty fish each week but took the 1-gram omega-3 supplement experienced:
  • 19 percent reduced chance of any of one of three cardiovascular events†
  • 22 percent reduced risk for an angioplasty procedure†
  • 28 percent decreased risk of heart attack†
• There were fewer fatal and non-fatal heart attacks and the need for stents or bypasses in the group taking omega-3†. (There was no reduction in stroke risk or overall risk of death.)
• The cardioprotective benefits of omega-3 use demonstrated in this study are consistent with basic science research showing that omega-3 fatty acids:
  • Lower blood pressure†
  • Reduce the risk of blood clots and vascular inflammation†
  • Inhibit the growth of atherosclerotic plaque (hardening of the arteries)†
  • Reduce the tendency to develop abnormal heart rhythms†
  • Promote blood vessel relaxation†

One fact cannot be emphasized enough, according to Dr. Radford: “…if you do not eat one or two servings of fish per week (and most people don’t), you can support cardiovascular function simply by taking 1 gram of fish oil every day.” A daily serving of Cooper Complete Advanced Omega-3 contains 1.4 grams of omega-3 fatty acids.

Omega-3 and Brain Health: Cognitive Function and Brain Aging

Omega-3 is the basic building block for neurons in the brain. The brain has a high concentration of omega-3 fatty acids, which can help different brain regions communicate with each other. Therefore, a low omega-3 level can have a detrimental effect on brain health.

Studies have shown omega-3s’ benefits in supporting cognitive function, migraine headaches, and ADHD in children†.

• In a six-month randomized controlled trial investigating omega-3 health benefits from supplementation on object-location memory, a group receiving 2.2 grams of omega-3 for six months scored significantly better in post-trial memory tests compared to participants who received the placebo†.
• Researchers at the University of North Carolina at Chapel Hill found that a high omega-3 diet reduced the frequency of migraines by two headache days per month compared to the control group. A second group with a diet high in omega-3 and reduced omega-6 (n-6 linoleic acid, commonly found in plant oils) saw a reduction of 4 headache days per month. Participants in both groups reported shorter and less severe headaches than those in the control group.†
• A review of 10 randomized trials involving children with ADHD found that those who took omega-3 exhibited modest improvement in hyperactivity and inattentiveness.†

Omega-3 Fatty Acids and Healthy Brain Aging

Recent research has examined whether omega-3 fatty acids can help protect against Alzheimer’s disease and age-related cognitive decline. A 2025 review published by Medscape (Omega-3 Fatty Acids and Alzheimer’s Risk: What Do the Data Show?) summarized decades of clinical and observational data. Key findings include:

• Baseline levels matter†: Individuals with low omega-3 status may experience slower rates of cognitive decline when supplementing with EPA and DHA†.
• DHA is especially important†: Research suggests that DHA plays a critical role in maintaining brain structure and function, although more evidence is needed to establish its direct protective effects†.
• Potential influence on amyloid and tau: Omega-3s may help regulate the buildup of proteins linked with Alzheimer’s disease, but results remain inconsistent†.
• Gender differences: Some studies indicate women may experience greater cognitive benefit from higher DHA intake than men, possibly due to hormonal and metabolic factors†. More research is needed to clarify these patterns.
• Association, not causation: Researchers caution that most data highlight associations, not proof that omega-3s prevent Alzheimer’s†. As one author explained, “This finding could reshape treatment approaches from simply lowering cholesterol numbers to focusing on optimizing the types of lipid particles in the blood,” reflecting the complexity of brain health research.

Overall, the review emphasizes that omega-3 intake, whether through fatty fish or high-quality supplements, remains a promising lifestyle factor for supporting long-term brain health.† However, more targeted studies are needed before firm conclusions can be drawn about its direct effect on Alzheimer’s disease prevention.†

Omega-3 for Eye Health and Visual Comfort

Age-related macular degeneration (AMD) is the leading cause of blindness in older Americans. While a clear link between fish consumption and AMD risk has not been established, research shows that a diet rich in omega-3 fatty acids supports eye health. Research subjects with advanced AMD were significantly less likely to include adequate levels of fatty fish in their diets. On average, participants who ate 1 or more servings of fatty fish each week were 60% less likely to have advanced AMD than those who ate fewer than 1 serving each week.† This study highlights an association, not a cause, of omega-3 consumption reducing AMD.

Fish oil has also been found to help relieve dry eye in adults, whether associated with computer use or contact lens wear. A study of young adults found that a daily serving of fish oil—each providing 180 mg EPA and 120 mg DHA—for three months supported tear production and visual comfort†. Additionally, an Australian study of adults experiencing dry eye discomfort from the use of soft disposable contact lenses found fish oil capsules (900 mg EPA; 600 mg DHA) significantly reduced self-reported dry eye symptoms.†

Omega-3 and Sleep Health: The DHA–Melatonin Connection

The rate of natural melatonin formation in the body depends on the activity of specific enzymes represented mostly in the pineal gland. The rhythm of enzyme activity—and synthesis of melatonin—may be altered by the level of omega-3 in the body. In a study published by the National Library of Medicine (NIH) involving rodents as research subjects, an omega-3-deficient diet reduces nighttime melatonin secretion, which returns to normal with supplemented DHA. Cooper Complete Advanced Omega-3 contains 480 mg of DHA in every two-softgel daily serving.

In a subsequent NIH study, fatty fish consumption was shown to improve biological functions involved in self-regulation, such as heart rate variability (HRV), suggesting that omega-3 levels may also influence the quality of sleep and daily functioning. It also appears that sufficient levels of vitamin D and high HRV may be associated with these beneficial effects.

Omega-3 for Skin Health and Acne Support

Men and women with mild to moderate acne can experience a significant reduction in the number and severity of acne lesions by supplementing their diets with omega-3 fatty acids.† After taking daily servings of omega-3 containing 1,000 mg each of EPA and DHA, participants in this small study saw:

• 6 percent reduction in inflammatory acne lesions†
• 6 percent reduction in non-inflammatory lesions†
• 29 percent reduction in lesion severity†

Omega-3 and Gut Health: Supporting the Microbiome

According to a study published in the National Library of Medicine (NIH), omega-3 polyunsaturated fatty acids (PUFAs) are actually considered prebiotics. While much research is still needed to fully understand the relationship between omega-3 PUFAs and gut microbiota—the collection of microorganisms in each person’s gastrointestinal system—this study has shown that omega-3 PUFAs exert effects on the intestines and can provide health benefits to individuals suffering from digestive issues.

Growing evidence from animal model studies indicates the interplay between gut microbiota, omega-3 fatty acids and immunity helps maintain intestinal wall integrity and interacts with host immune cells. Omega-3 can exert a positive action by supporting a balanced gut microbiome† and supporting intestinal barrier function.

The same NIH study identified common changes in the gut microbiota associated with omega-3 supplement use. Results were highlighted by a decrease in the microorganism, faecalibacterium, and an associated increase in bacteroidetes and butyrate-producing bacteria from the Lachnospiraceae family. Butyrate is among the most abundant short-chain fatty acids (SCFAs) in the gut and has been shown to improve IBD symptoms. Omega-3 reverts the patient’s microbiota to a healthier composition, triggering a healthy chain reaction and increasing SCFA amounts, with their anti-inflammatory action improving this pathology.

(Bonus: Look at the infographic and learn about the types of omega-3 fatty acids.)

Omega-3 and Inflammatory Balance

According to Kenneth H. Cooper, MD, MPH, a pioneer in preventive medicine, Chairman and Founder of Cooper Aerobics, “Chronic inflammation is the root cause of the onset of chronic disease. But, if interfered with by an anti-inflammatory such as omega-3, one can reverse this pathology.”

Cooper Clinic President and CEO Camron Nelson, MD, adds that omega-3 health benefits are highlighted by its “anti-inflammatory effect … in the arteries. Because the body cannot manufacture omega-3 fatty acids, it’s important to consume them through diet and supplements.” A study published in the American Heart Association’s Circulation Research journal found fish oil supplements reduced inflammation by increasing the concentration of “mediators” that regulate the work of specific components in the blood.†

The long-chain omega-3 fatty acids associated with its anti-inflammatory benefits—EPA and DHA—have been tested and studied for the treatment of symptoms of specific autoimmune diseases, including:

• A Swedish study found that consistent, long-term intake of omega-3 was associated with a 52% lower risk of developing rheumatoid arthritis.†
• A European study showed people with the highest consumption of DHA had a 77% reduced risk of developing ulcerative colitis.†

Omega-3 for Mood, Stress, and Emotional Well-Being

Omega-3 health benefits also include supporting emotional well-being.† Researchers studying the impact of cultural characteristics on health issues have found populations that consume higher levels of fatty fish, such as salmon—and therefore more omega-3—have lower overall levels of depression. Furthermore, through its specific fatty acid EPA, omega-3 health benefits were found to be highly significant when added to ongoing antidepressant therapy.

Omega-3 deficiency, especially during intrauterine and early life, is also associated with impaired psychomotor development, attention, cognition, and visual acuity. In addition, a substantial decrease in brain omega-3 levels—DHA in particular—was found in patients with autism spectrum disorder, correlating with mood and behavioral disorders such as anxiety and depression later in life.

What the Science Says About Omega-3 and Cancer Risk

While not all studies on omega-3 health benefits show significant effects on the risk of most cancers, analysis of data from the VITAL study found supplementation significantly reduced the risk of precancerous colorectal growths, precursors to colorectal cancer. Additionally, individuals diagnosed with colorectal cancer who consume 300 mg or more of omega-3 each day have a 41 percent lower risk of dying from the disease than those consuming less than 100 mg/day.

Studies show consuming higher levels of EPA and DHA from fish is also associated with a 25 percent lower risk of recurrence and a 25-34 percent lower risk of death from breast cancer. A third study concluded that among postmenopausal women, current use of fish oil supplements was associated with a 32 percent reduction in the risk of breast cancer. Clinicians in this study point out that more research is needed to replicate results in order to draw conclusions about omega-3s’ effect on reducing breast cancer risk.

How Much Omega-3 Do You Need? Expert Guidance

One serving of Cooper Complete Advanced Omega-3 softgels provides 1,400 mg combined of 720 mg Eicosatetraenoic Acid (EPA) and 480 mg Docosahexaenoic Acid (DHA) (plus 200 mg additional omega-3 fatty acids), the daily dosage recommended by Cooper Clinic physicians.

This article reflects the clinical experience and interpretation of published research by Cooper Clinic physicians. It is intended for educational purposes only and does not constitute medical advice. Nutritional supplements are not intended to diagnose, treat, cure, or prevent any disease. Individual needs vary, and readers should consult their personal health care provider before making changes to their diet or supplement routine.

(Bonus: Learn how to compare different omega-3 supplements in the marketplace.)

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About the Author: Jill Turner is the President of Cooper Complete® Nutritional Supplements, where she oversees product development and customer experience. She enjoys writing about vitamins, supplements, and preventive health to help consumers make informed, science-backed decisions.

Cooper Complete January 13, 2026