What Omega-3 Is, in Plain English
Omega-3 is a family of polyunsaturated fatty acids that the body can barely make on its own and has to get from food. They sit inside the membrane of every cell, affect how fluid and functional those membranes are, and help regulate inflammatory processes. When people say "omega-3," they usually mean three key acids, and each one has its own job to do.
EPA, DHA and ALA — Three Acids Worth Telling Apart
EPA and DHA are the "marine" omega-3s found in oily fish and algae, and they act as the active form that supplement choices are built around. ALA is the plant-based omega-3 from flaxseed and rapeseed oil, walnuts and chia seeds. The body can convert ALA into EPA and DHA, but it does so inefficiently, which makes relying on plant sources alone difficult.
- EPA — linked primarily to cardiovascular support and a healthy inflammatory balance
- DHA — a structural building block of the brain and the retina, especially important for the nervous system
- ALA — the plant-based form that only partly converts into EPA and DHA
How Omega-3 Differs From Omega-3-6-9
An "omega-3-6-9" complex is not a stronger version of omega-3 — it is a blend of three different groups of fatty acids. Omega-6 and omega-9 are already abundant in the modern diet: omega-6 is plentiful in sunflower and other vegetable oils, and the body can produce omega-9 on its own. The problem for most people is a tilt toward omega-6 and a shortfall specifically in omega-3. So if your goal is to close that gap, it usually makes more sense to choose pure omega-3 with a clear EPA and DHA content rather than an all-in-one complex where the share of useful omega-3 may be small. An omega-3-6-9 blend can have a place in a diet that is low in fats overall, but that is an individual question.
Why You Need Omega-3: The Main Functions
Omega-3 is involved in several body systems at once, which is why it is grouped with foundational nutrients like vitamin D. Below are the areas where its role has been studied most. One thing to keep in mind: this is about supporting the normal workings of the body, not about treating disease.
- Heart and blood vessels — support for normal triglyceride levels and vascular elasticity
- Brain and memory — DHA is part of nervous tissue and affects focus and cognitive function
- Vision — DHA is a structural component of the retina
- Skin and hair — a role in the skin lipid barrier, supporting hydration and elasticity
- Immunity and inflammatory balance — helping regulate inflammatory responses
What Differs for Women, Men and Children
Everyone needs omega-3, but the emphasis shifts. For women, these fatty acids help support the condition of skin and hair and hormonal balance, especially during demanding periods; during pregnancy and breastfeeding the need for DHA rises, but in that case the dosage should be set by a doctor only. For men, omega-3 is of interest for cardiovascular health and support during intense training. For children, DHA matters for brain, nervous system and eye development — there are dedicated kids' formats with a suitable dosage and taste. The specific dose and format for a child should be decided by a pediatrician.
Signs of Deficiency and Sources of Omega-3
An omega-3 shortfall builds up gradually and shows up in non-specific ways, so it is easy to write off as fatigue or the season. Dry, flaky skin, brittle hair and nails, dry eyes, trouble concentrating and general sluggishness can all be indirect hints of a shortfall. These are reasons to rethink your diet and talk to a specialist, not a diagnosis. The main food sources are oily marine fish (mackerel, herring, salmon, sardines), and among plant sources — flaxseed oil, walnuts, chia and flax seeds. If fish rarely makes it onto your plate, it is reasonable to consider a supplement with EPA and DHA to cover your daily needs consistently.
- Oily fish 2-3 times a week — the best food source of EPA and DHA
- Flaxseed and rapeseed oil, walnuts, chia — sources of plant-based ALA
- Fish oil or algae-based omega-3 supplements — a convenient way to keep a steady dose
How to Choose and Take Omega-3
When choosing, look not at the total amount of "fish oil" but at the active EPA and DHA content per serving — those are the numbers that determine a product's value. As a general reference for support, around 250-500 mg of combined EPA + DHA per day is often mentioned, but the exact dosage depends on your diet, age and health. Take omega-3 with a meal that contains fats — that way the acids absorb better and cause no discomfort. The effect of omega-3 is cumulative, so it is usually taken as a course rather than one-off. Pay attention to freshness and protection against oxidation: a quality product should not have a sharp, rancid aftertaste.
- Focus on the amount of EPA + DHA per serving, not the total capsule weight
- Take it with a meal containing fats for better absorption
- Take it as a course — the effect develops gradually
- Confirm dosage for pregnant women, nursing mothers and children with a doctor
Where to Find Omega-3 in the Greenway Catalog
In the Greenway supplement range, the nutrition direction is handled by the Welllab brand — it offers omega-3 as well as vitamins, minerals and complexes for heart and vascular support. In our partner catalog these products are easy to find through the dietary supplements section or the Welllab brand page: you can see the composition and description there, and you can place an order on the official Greenway website via the "Buy" button. Registering as a partner unlocks a discount from 20% on the whole range. Remember: a dietary supplement is not a medicine — it does not replace a balanced diet or medical treatment, so it is worth consulting a doctor before taking any supplement.