What Are Omega-3 Fatty Acids?
Though they are considered to be essential fatty acids, the human body cannot produce omega-3s on its own. Also known as polyunsaturated fatty acids (PUFAs), they play a crucial role in brain function and development.
Omega-3s are a family of long-chain polyunsaturated fatty acids that serve as structural components of cell membranes throughout the body, particularly in the brain, retina, and heart. Because humans cannot synthesize these fatty acids de novo, we must obtain them through diet or supplementation—making them "essential" nutrients.
The discovery of omega-3s' health importance emerged from epidemiological observations of Greenland Inuit populations in the 1970s, who consumed high amounts of fatty fish yet had remarkably low rates of cardiovascular disease. Since then, there have been more than 40,000 published studies on the benefits of omega-3 fatty acids, establishing them as among the most researched nutrients in human health.
At the molecular level, omega-3s influence gene expression, modulate inflammation through the production of specialized pro-resolving mediators (SPMs), maintain cell membrane fluidity, and serve as precursors to bioactive compounds that regulate numerous physiological processes.
The Three Types of Omega-3s: EPA, DHA, and ALA
Not all omega-3s are created equal. Three primary types exist, each with distinct structures and functions:
EPA (Eicosapentaenoic Acid)
A 20-carbon omega-3 fatty acid found primarily in marine sources. EPA is a precursor to series-3 prostaglandins and series-5 leukotrienes, which help regulate inflammatory responses. Research suggests EPA plays a particularly important role in cardiovascular health and mood regulation.
DHA (Docosahexaenoic Acid)
A 22-carbon omega-3 fatty acid that is the most abundant omega-3 in the brain and retina. Approximately 60% of the brain is made up of fat, and the most prominent fat in the brain and retinas is DHA. DHA is critical for brain development in infants and cognitive function across the lifespan.
ALA (Alpha-Linolenic Acid)
An 18-carbon omega-3 found in plant sources like flaxseed, chia seeds, and walnuts. While ALA is essential, humans convert only about 5-10% of ALA to EPA and less than 1% to DHA, making direct sources of EPA and DHA more efficient for meeting omega-3 needs.
Omega-3s are also found in algae, krill, some plants, and even some nut oils, but marine sources provide the most bioavailable EPA and DHA.
Health Benefits of Omega-3s Across All Life Stages
The research supporting omega-3 benefits spans virtually every stage of human development and addresses multiple body systems.
Prenatal and Infant Development
Studies show the omega-3s EPA and DHA promote healthy brain, vision, and nervous system development; sleep; and learning in children. Maternal DHA intake during pregnancy and lactation directly influences fetal brain development and infant cognitive outcomes.
Internal link opportunity: Connect to Mom's DHA, Mom's DHA with Choline, and Prenatal product pages.
Cardiovascular Health
The American Heart Association (AHA) recommends we eat fish at least twice per week to reach the recommended daily intake of omega-3s. Cold-water fish such as tuna, sardines, mackerel, salmon, lake trout, and herring are especially high in omega-3 fatty acids.
Omega-3s support cardiovascular function through multiple mechanisms: reducing triglyceride levels, supporting healthy blood pressure, improving arterial compliance, reducing platelet aggregation, and modulating inflammatory markers associated with atherosclerosis.
Internal link opportunity: Link to Elite Omega-3 Gems, Maximum Omega 2000, and blog content on heart health.
Brain and Cognitive Function
DHA comprises approximately 40% of the polyunsaturated fatty acids in the brain. It maintains neuronal membrane integrity, supports synaptic plasticity, and influences neurotransmitter systems. Omega-3s have an immense amount of research showcasing how they support mood, memory, brain, nerve, vision, joint, cardiovascular health, and more.
Internal link opportunity: Connect to Elite DHA Gems and blog posts on cognitive health, focus, and concentration.
Joint Health and Mobility
Omega-3s produce specialized pro-resolving mediators (SPMs) that help resolve inflammatory processes. This makes them valuable for supporting joint comfort and mobility, particularly in active individuals and aging populations.
Internal link opportunity: Link to blog content on fitness supplements and active lifestyle support.
Vision Health
DHA is concentrated in the photoreceptor cells of the retina, where it supports visual acuity and retinal function. Adequate DHA intake is associated with reduced risk of age-related macular degeneration.
Immune Function
Omega-3s modulate immune cell function and inflammatory signaling pathways, supporting balanced immune responses without suppressing necessary immune activity.
Omega-3 Deficiency: Signs and Risk Factors
Because the body cannot produce omega-3s, inadequate dietary intake leads to deficiency. The American Heart Association (AHA) recommends eating at least two 3.5-ounce servings of fatty fish per week in order to get an adequate amount of omega-3s. Fatty fish, including salmon, mackerel, and sardines are a great source of omega-3s; however, most of us don't get enough fish in our diet to reach the recommended intake.
Common signs of omega-3 deficiency include:
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Dry, rough, or scaly skin
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Brittle hair and nails
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Difficulty concentrating or "brain fog"
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Joint discomfort
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Mood changes
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Fatigue
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Poor sleep quality
Populations at higher risk for deficiency:
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Individuals who consume little to no fatty fish
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Strict vegetarians and vegans (who lack direct EPA/DHA sources)
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Pregnant and lactating women (due to increased DHA demands)
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Older adults (who may have reduced conversion efficiency from ALA)
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People with fat malabsorption conditions
Food Sources vs. Supplements
Dietary Sources
The richest food sources of EPA and DHA are cold-water fatty fish. Mackerel topping the charts at over 5,000 mg per 3.5-ounce serving, followed by salmon, sardines, anchovies, and herring.
Other sources include:
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Cod liver oil: Traditional omega-3 source that also provides vitamins A and D
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Algae: The original source of DHA in the marine food chain; suitable for vegetarians
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Krill: Small crustaceans that provide omega-3s in phospholipid form
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Plant sources (ALA only): Flaxseed, chia seeds, hemp seeds, walnuts
When Supplements Make Sense
If you can't or don't want to eat fresh fish for dinner a couple nights a week, fish oils and omega-3 supplements are an excellent alternative. To ensure you're receiving the highest quality supplements, shop Carlson for your children, teen, and adult omega-3s.
Supplements offer several advantages:
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Consistent dosing: Precise EPA and DHA amounts per serving
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Purity assurance: Third-party testing removes contaminants found in some fish
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Convenience: No fish preparation required
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Taste options: Flavored liquids and soft gels eliminate fishy taste
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Concentrated potency: Higher omega-3 levels than most food sources
Internal link opportunity: Link to omega-3 supplements collection page and The Very Finest Fish Oil products.
Understanding Omega-3 Forms: TG, EE, rTG, and PL
Fish oils are commonly available in four forms: TG (Natural Triglyceride), EE (Ethyl Ester), rTG (Re-Esterified Triglyceride), and PL (Phospholipid). Understanding these forms helps consumers make informed choices.
Natural Triglyceride (TG)
Fish naturally contain the omega-3 fatty acids EPA and DHA as triglyceride esters (TG). Natural TG fish oils provide a maximum of 300 mg of combined EPA and DHA per 1,000 mg of oil (30% potency). These are the most common fish oils on the market, and some prefer them because of their close similarity to eating fish.
Advantages:
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Natural form found in fish
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Well-absorbed with food
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No chemical processing required
Limitations:
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Lower concentration (typically 30% omega-3s)
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Cannot adjust EPA:DHA ratios
Ethyl Ester (EE)
Since EPA and DHA concentration and ratio can't be altered in natural TG fish oils, the ethyl ester (EE) fish oil form was created. By removing the glycerol backbone of a TG fish oil, the result is three free fatty acids (FFAs) and a free glycerol molecule. An ethanol molecule is attached to each FFA, creating EEs.
Advantages:
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Higher concentration possible (50-90% omega-3s)
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Precise EPA:DHA ratios
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More cost-effective for high-dose products
Considerations:
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Requires molecular distillation (processing step)
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Some research suggests slightly lower absorption than TG forms when taken without food
Re-Esterified Triglyceride (rTG)
Re-esterified triglycerides (rTGs) are created when EEs are freed from their attached ethanol groups and are once again bound to a glycerol backbone. rTGs retain the same potency and fatty acid ratios of their EE counterparts.
Advantages:
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High concentration (60-90% omega-3s)
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Triglyceride structure for better absorption
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Precise EPA:DHA ratios
Considerations:
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Most processing-intensive form
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Typically higher cost
Phospholipid (PL)
Omega-3s bound to phospholipids, as found in krill oil and some algae sources. Phospholipids are structural components of cell membranes.
Advantages:
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May enhance cellular uptake
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Contains astaxanthin (in krill sources)
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Water-dispersible
Considerations:
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Lower total omega-3 content per serving
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Higher cost per gram of EPA/DHA
Which Form Is Best?
Whether we choose a TG, EE, rTG, or PL oil, our EPA and DHA blood levels can be easily raised to an optimal amount when taken daily. Omega-3 supplements are lifestyle supplements meant to be taken long-term for the benefits associated with an EPA and DHA red blood cell concentration above 8%.
The "best" form depends on individual needs, budget, and preferences. All forms effectively raise omega-3 blood levels when taken consistently with food.
Quality Standards and Third-Party Testing
Not all omega-3 supplements meet the same quality standards. Third-party testing and certification programs verify purity, potency, and freshness.
IFOS (International Fish Oil Standards)
International Fish Oil Standards (IFOS) is the only third-party testing and certification program exclusively for fish oil supplements. This voluntary program tests the purity, potency, and freshness of fish oils.
IFOS testing evaluates:
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Purity: PCBs, dioxins, furans, mercury, lead, arsenic, cadmium
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Potency: EPA and DHA content matches label claims
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Freshness: Oxidation markers (peroxide value, anisidine value, TOTOX)
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Other contaminants: Pesticides, microbiological contaminants
More than 30 Carlson omega-3 products are IFOS certified and independently tested for purity, potency, and freshness.
Internal link opportunity: Link to "The Carlson Omega-3 Difference" page and IFOS certification information.
Friend of the Sea (FOS)
Friend of the Sea (FOS) is a non-profit, non-governmental organization, whose mission is marine habitat conservation. Known for their strict guidelines and procedures, FOS is a leading international certifiecation project.
FOS certification verifies:
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Sustainable fishing practices
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Stock management that prevents overfishing
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No endangered species in catch
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Minimal environmental impact
IGEN Non-GMO Certification
International GMO Evaluation and Notification (IGEN) is a voluntary third-party certification program that tests for the presence of genetically modified organisms (GMOs). The IGEN non-GMO icon can be found on the front of all tested Carlson omega-3 products.
Superior Taste Awards
Carlson's delicious and natural liquid fish oil flavors have been honored with Superior Taste Awards from the renowned chefs and sommeliers of the International Taste & Quality Institute (ITQI).
Internal link opportunity: Link to flavored liquid fish oil products (lemon, orange, mixed berry flavors).
FDA-Registered Laboratory Testing
Carlson sources the highest quality ingredients, and every product is tested by an FDA-registered laboratory for potency and quality.
Sustainability and Responsible Sourcing
Sustainable omega-3 sourcing protects marine ecosystems while ensuring long-term product availability.
Carlson's Sourcing Standards
To ensure freshness, Maximum Omega 2000 is closely managed from sea to store. We source the highest quality, deep, cold-water fish using traditional, sustainable methods.
This "sea to store" approach includes:
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Selective sourcing: Deep, cold-water fish from well-managed fisheries
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Traditional methods: Sustainable fishing techniques that minimize bycatch
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Rapid processing: Fish processed quickly after catch to preserve freshness
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Controlled supply chain: Oversight from ocean to finished product
Freshness Preservation
Carlson liquid fish oils are bottled with a touch of antioxidants and are given a nitrogen flush to remove air, prevent oxidation, and ensure long-lasting freshness. Our soft gels are encapsulated using the same high standards.
Protection methods include:
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Antioxidant addition: Natural vitamin E to prevent oxidation
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Nitrogen flushing: Removes oxygen from bottles before sealing
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Light-protective bottles: Dark glass or opaque containers block UV light
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Airtight sealing: Prevents oxygen exposure during storage
Plastic Neutrality
The full Carlson product line is 100% plastic neutral. Carlson offsets the plastic in our products through investments in certified plastic removal projects taking place in our global waterways. To date, we've helped remove more than 1/4 million pounds of plastic, which is then recycled or upcycled.
Internal link opportunity: Link to sustainability/environmental commitment page.
How Much Omega-3 Do You Need?
Omega-3 requirements vary based on age, health status, and specific health goals.
General Population Recommendations
The American Heart Association recommends 500 mg of omega-3s for the general healthy adult population; however, recent studies are showing many health benefits when consuming 1,000-3,000 mg (1-3 g) daily.
Basic maintenance (healthy adults):
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500-1,000 mg combined EPA+DHA daily
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Achievable through 2 servings of fatty fish per week or daily supplementation
Enhanced support (specific health goals):
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1,000-2,000 mg combined EPA+DHA daily for cardiovascular support
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1,000-2,000 mg DHA daily for cognitive and vision health
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2,000-3,000 mg combined EPA+DHA daily for joint support and active lifestyles
Life Stage Considerations
Pregnancy and lactation:
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300-600 mg DHA daily for fetal brain development
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Continue through breastfeeding to support infant development
Internal link opportunity: Link to prenatal omega-3 products and Mom's DHA.
Children:Dosing varies by age and body weight. Studies show the omega-3s EPA and DHA promote healthy brain, vision, and nervous system development; sleep; and learning in children.
Internal link opportunity: Link to Kid's Cod Liver Oil and children's omega-3 products.
Older adults:Higher doses (1,000-2,000 mg daily) may support cognitive function, cardiovascular health, and joint mobility.
Internal link opportunity: Link to blog content on aging gracefully and men's/women's health by decade.
Measuring Your Omega-3 Status
The Omega-3 Index measures EPA+DHA as a percentage of total red blood cell fatty acids. An index of 8% or higher is associated with optimal health outcomes.
Internal link opportunity: Link to Omega-3 Test Kit product page.
Choosing the Right Omega-3 Supplement
With dozens of omega-3 products available, selection depends on individual needs, preferences, and health goals.
Decision Factors
1. EPA vs. DHA ratio
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Balanced EPA+DHA: General health, cardiovascular support → The Very Finest Fish Oil, Super Omega-3 Gems
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Higher EPA:
