Omega 369 supplement benefits are strongly affected by what you eat and the type of omega supplement you take.
This is because the types of fats you eat in a day can overpower any benefits of taking an omega 3 6 9 supplement.
And some omega 3 6 9 supplements are pretty unhealthy, while others are genuinely worth taking.
✦ Quick Answer: Omega-3s (from fatty fish or algae) are the ones with the strongest, most consistent research behind them — for heart, joint, and skin health. Omega-6s are essential too, but most people already get plenty from vegetable oils; the omega-6 fats worth adding on purpose are GLA and CLA, not more soybean or corn oil. Omega-9s are non-essential but still beneficial, mainly from olive oil and avocados. The 2:1:1 omega 3:6:9 ratio on supplement labels is a formulation target, not a clinical requirement — what the research actually tracks is your omega-6 to omega-3 ratio, and lower is better.
Let’s dig in a little further, including what’s changed in the research since I first covered this topic.
Omega 3 6 9 benefits overview
*Except GLA and CLA, two omega-6 fats that are anti-inflammatory — more on that below.
In an ideal world, your body gets a good amount and ratio of omega 3 6 9 fats from your diet.
By keeping these dietary fats in balance, you help your body maintain healthy skin, hair, and immune function, among other things.
Omega fatty acids come in three main categories. The main health roles of each are:
- Omega-3 fatty acids: support every cell’s normal function and help resolve inflammation. This is one of the essential fatty acid families in the diet, meaning you can’t make it yourself — you have to eat it. Some types of omega-3 fats are more metabolically active than others.
- Omega-6 fatty acids: help the body mount an immune response and are also essential. However, most people eating a Western diet get far more omega-6 than they need, which tips the inflammatory balance. Some omega-6 fats are healthier than others.
- Omega-9 fatty acids: support heart health and help dampen inflammation, but because the body can manufacture them internally, they’re considered non-essential. Some omega-9 fats are still better sources than others.
But, as you’ll see, there’s more to the story than just getting “more omegas.”
Omega 3-6-9 ratios: what the research actually measures
Many omega 3-6-9 supplements are formulated to a 2:1:1 ratio of omega-3 to omega-6 to omega-9. That ratio is a product design choice, not a number pulled from clinical trials — most research doesn’t track omega-9 intake at all, only the omega-3:omega-6 ratio.
What the evidence does support is that a lower omega-6 to omega-3 ratio in the diet — closer to what our hunter-gatherer ancestors likely ate — tracks with better inflammatory markers than the typical Western diet’s ratio, which runs closer to 15:1 or higher.
A 2026 meta-analysis of randomized trials pooling several hundred participants found that a favorable omega-6 to omega-3 ratio and inflammatory markers like CRP, IL-6, and TNF-α were linked, and that an excessively high ratio blunted omega-3’s anti-inflammatory effects.
So the practical takeaway isn’t “hit 2:1:1 exactly” — it’s “get more omega-3, and don’t pile on extra omega-6 from vegetable oil on top of it.” That matters because most people aren’t even hitting the omega-3 side of the equation: a 2025 global review of national intake recommendations found that roughly 76% of the world’s population falls short of recommended omega-3 intake, with pregnant women and people who rarely eat fish most likely to fall short.
Omega 3s and omega 6s: the polyunsaturated fatty acids
A simple way to remember the difference between omega-3 and omega-6 fatty acids:
- Omega-3s are generally anti-inflammatory (and pro-resolution — they actively help end an inflammatory response, not just blunt it).
- Omega-6s are generally pro-inflammatory, though this is more nuanced than it sounds.
There are a lot of gray areas here, so let’s explore both.
Types of omega-3 fats
There are four main types of omega-3 fats in the diet, and they function at different levels in the body.
Omega-3 fats have multiple double bonds in their carbon chain, which makes them more susceptible to oxidative damage. That’s why fresh fish, and cooking it at moderate-to-low temperatures, matters for preserving the benefits.
Categories of omega 3
- DHA (docosahexaenoic acid) comes primarily from wild-caught fatty fish. It’s a structural fat in brain and eye tissue and is tied to heart disease risk reduction and inflammation control.
- EPA (eicosapentaenoic acid), also from fatty fish, is more associated with mood regulation and lowering blood triglycerides.
- DPA (docosapentaenoic acid) is a less-studied fish-derived omega-3 that also lowers triglycerides and inflammation; emerging research suggests it may be nearly as important as DHA and EPA.
- ALA (alpha-linolenic acid) comes from plants — flaxseed, walnuts, canola oil, pumpkin seeds. ALA doesn’t work as effectively as DHA, EPA, or DPA, because the human body converts only a small fraction of it into an active form. That doesn’t mean flaxseed oil is useless — it has other benefits — but it’s not an equivalent substitute for fish-derived omega-3s.
Eating wild-caught fatty fish and taking a fish oil (or algae oil) supplement is the most reliable way to get enough omega-3 in the diet. You can also get smaller amounts from free-range eggs, grass-fed beef, wild game, and algae.
Many omega 3-6-9 supplements on store shelves use cheap, less-bioavailable forms of omega-3 and omega-6. Label reading matters here.
Related post: How to Choose: Cod Liver Oil vs Fish Oil.
Types of omega-6 fats
Omega-6 fats have a bad reputation, and it’s partly deserved — but they’re essential, meaning your body needs them and can’t make them on its own.
Some types of omega-6 fatty acids are genuinely healthy in the right proportions. Like omega-3s, omega-6 fats have multiple double bonds, so they oxidize easily. This is why omega-6-rich oils don’t have a long shelf life and shouldn’t be used for frying.
Categories of omega 6
- ARA (arachidonic acid), found in poultry, organ meats, fish, and eggs, supports normal immune function and lean muscle tissue. ARA is both pro-inflammatory (to mount an immune response) and involved in dampening inflammation once that response has done its job, since the body uses it to build signaling molecules called eicosanoids.
- LA (linoleic acid), the polyunsaturated fat in soybean, canola, peanut, and corn oil, is the one that gives omega-6 its bad name — it’s pro-inflammatory in the large amounts typical of a Western diet.
- GLA (gamma-linolenic acid), found in borage oil and evening primrose oil, is one of the omega-6 fats that actually dampens inflammation and helps regulate cell growth.
- CLA (conjugated linoleic acid), found primarily in 100% grass-fed beef and grass-fed milk, may help reduce body fat, lower cancer risk, and support heart health.
How to get the best omega-6 ratios
The most effective way to keep omega-6 in a healthy range is to cut back on processed, fried, and fast food — that’s where most of the excess LA comes from.
Use healthier cooking oils like coconut oil, extra virgin olive oil, and avocado oil instead of soybean oil, corn oil, or margarine.
You can also add a GLA supplement (borage or evening primrose oil) to get more of the anti-inflammatory omega-6 without adding to the pro-inflammatory load.
When choosing meat, 100% grass-fed beef has a better fat ratio and less saturated fat than conventional beef.
Omega 9s: the monounsaturated fatty acids
Omega-9 fatty acids, also known as oleic acid, are non-essential — your body can make them on its own. But eating foods rich in monounsaturated fat is still linked to better health, which is why organizations like the American Heart Association recommend it.
The best sources of omega-9 are avocados, extra virgin olive oil, flax seeds, and tree nuts. Omega-9 has only one double bond, positioned on the 9th carbon, which is part of why it’s more oxidation-stable than omega-3 or omega-6.
One of the best oils to use, bar none, is extra virgin olive oil, for its versatility, antioxidant content, and long track record.
Omega-9 benefits mainly come from its role in dampening inflammation and possibly supporting gut health.
Omega 3 6 9 benefits: putting it all together
There’s no one-size-fits-all answer here — the whole-food source of these fats matters as much as the category.
- For omega-3, high-quality fish oil (or algae oil) is the priority; flaxseed oil is a secondary option.
- For omega-6, GLA and CLA are the ones worth seeking out; ARA can help the immune system but most people already get enough from food.
- Omega-9 usually takes care of itself if you’re already using olive oil and eating nuts and avocado.
Omega 3 6 9 benefits for skin
The fats that most directly support skin are omega-3, GLA (as an omega-6), and omega-9 from extra virgin olive oil.
A review of 38 clinical studies on omega-3 and skin conditions found it helped with psoriasis, atopic dermatitis, acne, and skin ulcers.
GLA is where I want to add a caveat I didn’t have in the earlier version of this post. Older, smaller trials on borage oil for atopic dermatitis were genuinely mixed — some found real symptom improvement, some found none, and a large 24-week trial found no significant difference from placebo. A 2025 systematic review confirmed that pattern still holds. Mechanistically, GLA still makes sense — it supports the skin’s lipid barrier and reduces transepidermal water loss, which is why it shows up so often in dry-skin and barrier-repair research. But if you’re using it specifically for diagnosed eczema, treat it as a possible adjunct to your dermatologist’s plan, not a replacement for it — and skip it altogether if you have a known allergy to plants in the daisy family (borage, chrysanthemum, ragweed), since cross-reactivity is possible.
Omega-9 fats like extra virgin olive oil help reduce visible signs of skin aging by dampening inflammation.
Omega 3 6 9 benefits for the brain
This is another section where the research has gotten more nuanced since I first wrote this post, and I’d rather give you the honest picture than the tidy one.
Here’s the newest and, in my opinion, most compelling piece: a December 2025 analysis of over 217,000 UK Biobank participants found that adults 40–64 with higher blood omega-3 levels had up to a 40% lower risk of early-onset dementia (diagnosed before age 65) — and interestingly, the protective association was even slightly stronger for non-DHA omega-3s than for DHA alone, suggesting the whole omega-3 family matters, not just DHA.
Longer-term observational data agrees: an 8-year cohort study of older adults and omega-3 supplement use found that consistent users maintained memory and global cognitive scores better than non-users, and a 2025 dose-response meta-analysis on DHA and cognitive function supports a protective role for DHA specifically.
But two more recent, larger studies complicate the picture. A 2026 randomized trial in nearly 400 adults found that fish oil supplementation raised brain omega-3 levels without improving memory or cognitive performance or slowing brain shrinkage tied to Alzheimer’s risk. And a 2026 analysis using Alzheimer’s Disease Neuroimaging Initiative data on omega-3 and cognitive decline found supplementation was associated with faster decline in that specific population.
One thread that may help reconcile these findings: a 2025 review on omega-3 fatty acids and Alzheimer’s disease timing and phenotype suggests the effect may depend heavily on when supplementation starts and which form is used — EPA-dominant formulas with antioxidants showed more consistent cognitive benefit in existing Alzheimer’s patients than DHA-only formulas, and starting earlier (as in the UK Biobank data) looks more promising than starting after diagnosis.
My read: omega-3 still matters for baseline brain structure and function, and the observational, real-world-use data — especially the new UK Biobank findings on prevention starting in midlife — is fairly consistent on that. But it’s not a proven treatment once cognitive decline is already underway, and if you or a family member already has diagnosed cognitive decline, this is a conversation to have with a neurologist rather than a decision to make from a supplement label.
Separately, CLA (an omega-6) may reduce inflammation in neurons and reduce oxidative stress in the brain, and both CLA and GLA have shown early anti-cancer signals.
Omega 3 6 9 benefits for eyes
Omega-3 fats help reduce the risk of age-related macular degeneration, and both omega-3 and GLA (omega-6) help reduce dry eye symptoms.
Omega 3-6-9 benefits for joints
The anti-inflammatory effects of omega-3 fats ease joint pain and may help people with rheumatoid arthritis. In fact, adding omega-3 outperformed glucosamine alone for osteoarthritis symptoms in one trial.
Omega 3 6 9 benefits for oral health
This is a genuinely new section I’m adding based on research published just this past month. A secondary analysis of a 30-month randomized trial in 240 people with coronary artery disease found that those taking a high-dose prescription EPA + DHA formula had lower oral and systemic inflammatory markers, including a lower neutrophil-to-lymphocyte ratio, compared with the control group. It’s a small, secondary finding rather than a headline result, but it fits the broader pattern of omega-3 lowering systemic inflammation wherever it’s measured — gums included.
Omega-3 6 9 benefits for weight loss
On the Standard American Diet, omega-6 fats like linoleic acid tend to run excessive, and that skewed ratio is linked to higher obesity and weight-gain risk.
A better omega-3-to-6 balance appears to help with weight management too. One study found fish oil helped reduce belly fat, possibly by increasing fat burning in brown fat tissue.
Omega-3 also reduces joint inflammation, which indirectly supports weight management by making it easier to stay active. GLA may help prevent weight regain, and CLA may reduce body fat and body weight. Not much is known about omega-9’s direct effect on body weight.
Omega-3-6-9 benefits for diabetes
A good omega fat ratio may help reduce the risk of developing type 2 diabetes, and supplemental omega-3 reduces fasting glucose and insulin resistance markers in people who already have it.
A 2026 meta-analysis reviewing trials across type 1, type 2, and gestational diabetes found omega-3 supplementation was associated with lower fasting insulin and improved HOMA-IR scores in some trials, though HbA1c, fasting blood sugar, and cholesterol markers were largely unchanged overall — triglycerides were the exception, dropping in trials lasting 13–26 weeks. Inflammation markers like CRP didn’t move consistently in this analysis.
Omega-3 may also protect the kidneys from diabetes-related damage; one study found it reduced urinary protein loss in people with diabetes, and GLA supplementation reduced diabetic neuropathy symptoms in another.
Bottom line on the research: Omega-3’s benefits for joints, triglycerides, skin, and eyes are the most consistently supported. Its role in preventing cognitive decline is genuinely still being worked out — don’t let a supplement bottle oversell that one. Test not guess applies here too: if you’re managing diabetes, joint disease, or a skin condition, work with your provider on dosing rather than assuming more is better. #TheHealthyRD
Omega 3-6-9 side effects
Side effects of omega 3, 6 & 9 supplements are uncommon overall, since omega-3 and omega-6 are essential fats your body already expects to receive. A 2023 meta-analysis pooling 90 randomized trials found modestly higher rates of diarrhea, an altered sense of taste, and bleeding tendency with omega-3 supplementation compared with placebo, but no reports of definite serious adverse events across the trials reviewed.
⚠ If you’re sensitive to any of the ingredients, it’s best to avoid that product. This is the single most important safety note in this whole post. Fish oil and algae oil supplements can contain fish, shellfish, or soy-derived ingredients (like the softgel casing), and GLA supplements are derived from borage or evening primrose — plants some people react to. Read the full ingredient list, not just the front label, and if you have a known allergy or sensitivity to any ingredient in a product, skip it and choose a different formula rather than assuming a small amount is fine.
Beyond allergy and sensitivity concerns, always check with your healthcare provider before starting any new supplement, including omega 3 6 9, and follow the package directions for dosing. Large doses of omega-3 have been linked to stomach upset or increased bleeding risk, typically only a concern if you’re on blood-thinning medication.
Types of omega 3 6 9 to avoid
There are many brands of omega 3 6 9 supplements to choose from. Avoid ones that pad the formula with less healthy oils like soybean or canola oil — the same goes for the fats you choose to eat.
Instead, look for products that source their omega-6 from GLA or CLA rather than generic vegetable oil blends.
Vegetarian options are safe but generally don’t match fish oil’s anti-inflammatory potency, since most rely on flaxseed or walnut oil for omega-3 rather than the more bioactive marine forms. Algae oil is the exception — it’s the one plant-based source that actually delivers meaningful EPA and DHA rather than just ALA.
Best types of omega 3 6 9 supplements
I recommend sourcing your omega 3 6 9 supplement through Fullscript, which vets brands for third-party testing and purity before they’re listed — something you can’t verify buying blind off a general marketplace.
Nordic Naturals ProOmega-3·6·9
My top pick for a combined omega 3-6-9 formula. Each serving delivers 1,360 mg of total omega-3 (EPA + DHA), 285 mg of omega-6 (mostly GLA), and 160 mg of omega-9, all third-party tested for heavy metals, dioxins, and PCBs.
Contains fish and borage oil — avoid if you have a fish or daisy-family plant allergy.
Nordic Naturals Algae Omega
The best vegetarian/vegan option if you don’t eat fish. It’s one of the few algae oils that delivers a meaningful amount of EPA, not just DHA, which is where most plant-based omega-3 products fall short.
Fish-free and shellfish-free, but check the softgel ingredients if you have other food sensitivities.
Whichever formula you choose, look for one with third-party purity testing, EPA and DHA (not just ALA) if fish-derived, and GLA or CLA rather than soybean or canola oil as the omega-6 source — and again, if you’re sensitive to any listed ingredient, it’s best to avoid that product and pick a different formula.
Frequently asked questions about omega 3 6 9
What is the best omega 3:6:9 ratio?
Most supplements target a 2:1:1 ratio of omega-3 to omega-6 to omega-9, but that’s a formulation convention, not a clinical requirement — most research actually tracks the omega-6 to omega-3 ratio in the diet, and a lower ratio (closer to 1:1 to 4:1) is consistently linked to better inflammatory markers than the 15:1-plus ratio typical of a Western diet.
Can you take an omega 3-6-9 supplement every day?
Yes, for most healthy adults, following the label’s suggested serving is fine daily. Check with your healthcare provider first if you’re on blood thinners, since higher doses of omega-3 can increase bleeding risk.
Are omega-6 fats bad for you?
No — omega-6 is an essential fat your body needs. The issue is that most people eating a Western diet already get far more omega-6 than they need from vegetable oils and processed food, which throws off the balance with omega-3. Specific omega-6 fats like GLA and CLA are actually anti-inflammatory.
What’s the best vegetarian omega 3-6-9 supplement?
Look for an algae-oil-based formula that provides both EPA and DHA, not just ALA. Most plant oils like flaxseed only provide ALA, which the body converts to active omega-3 forms very inefficiently.
What if I’m sensitive to an ingredient in an omega 3-6-9 supplement?
If you’re sensitive to any of the ingredients in a product, it’s best to avoid that product entirely rather than take a smaller dose. Fish oil and algae oil supplements can contain fish, shellfish, or soy, and GLA supplements come from borage or evening primrose, plants in the daisy family. Read the full ingredient list before buying, and choose a different formula if anything on it is a known trigger for you.
The information on this website has not been evaluated by the Food & Drug Administration or any other medical body and is shared for educational purposes only. While The Healthy RD’s posts are backed by research, you are unique, so you must seek care from your own dietitian or healthcare provider. This post is not meant to diagnose or treat any conditions. Consult your doctor or healthcare provider before making changes to your supplement regimen or lifestyle.
