Combining omega-3 fish oil (EPA and DHA) and vitamin D3 is a popular and efficient way to support cardiovascular function, bone density, and immune health . When choosing a combination supplement, it is best to look for brands that undergo independent third-party testing (such as USP, NSF, or IFOS ) to ensure purity, potency, and freedom from heavy metals.
Top-tier options combining omega-3 fish oil and vitamin D include:
Nordic Naturals Ultimate Omega-D3 : A gold standard in the fish oil market. It provides a high-potency dose of total omega-3s (1,280 mg per serving, including EPA and DHA) alongside 1,000 IU of vitamin D3, sourced sustainably from wild-caught small fish with a clean lemon flavor. You can view details on the Nordic Naturals Ultimate Omega-D3 Page.
Sports Research Omega-3 Fish Oil + D3 : This option features triple-strength, wild-caught Alaskan pollock providing over 1,000 mg of omega-3s paired with a robust 2,500 IU of vitamin D3. It is MSC-certified for sustainability, making it a strong choice if you want a higher vitamin D potency alongside your daily omega-3s.
Nature Made Fish Oil Omega-3 with Vitamin D3 : An accessible, budget-friendly, and reliable option that is USP-verified . A standard serving typically supplies around 720 mg of omega-3s (600 mg EPA/DHA) and 2,000 IU of vitamin D3 to support both heart and immune health.
NOW Foods Tri-3D Omega : Formulated using a molecularly distilled, triglyceride-form omega-3 fish oil combined with 1,000 IU of vitamin D3. NOW Foods is well-regarded for strict internal quality control and affordable everyday wellness formulations.
Carlson Labs Cod Liver Oil (Liquid or Softgels) : If you prefer a traditional single-source option, high-grade Norwegian cod liver oil naturally provides a blend of omega-3 fatty acids, vitamin A, and vitamin D3. Carlson's liquid options offer a clean, award-winning profile with added vitamin D3.
If you'd like, let me know:
Your preferred format (softgels vs. liquid)
If you have a specific dosage target for Vitamin D3 or EPA/DHA
I can help narrow down the ideal choice for your routine.
If you're looking for a supplement that combines omega-3 fish oil and vitamin D3 (cholecalciferol), there are several good options to consider for heart health, immune function, and general wellness.
The key is to look beyond the front label: compare the actual amounts of EPA and DHA (the main omega-3 fatty acids), the vitamin D dose, product quality testing, and whether the formula suits your health needs.
One important distinction: omega-3s can lower elevated triglycerides, but taking a fish oil supplement does not automatically prevent heart attacks or strokes. Vitamin D supports bone health and normal muscle and immune function, but more isn't necessarily better.
4 good omega-3 + vitamin D supplements to compare
These are real products with both nutrients in the same formula. I've prioritized clear label information, quality testing, and different dosage needs.
1. Nordic Naturals Arctic-D Cod Liver Oil
(Best balanced option)
Liquid · 1 teaspoon daily
Omega-3s: 1,060 mg total, including 340 mg EPA and 510 mg DHA.
Vitamin D3: 1,000 IU (25 mcg).
Why consider it: A moderate vitamin D dose, lemon flavor, and a straightforward formula with third-party purity testing.
Why consider it: A higher vitamin D dose paired with Norwegian cod liver oil; the manufacturer reports lab testing for freshness, potency, and purity.
Best for: Someone who specifically wants 2,000 IU of vitamin D daily, provided that dose fits their needs.
3. Carlson Omega-3 + D
Softgels · 2 daily
Omega-3s: 600 mg total, including EPA and DHA.
Vitamin D3: 2,000 IU (50 mcg).
Why consider it: A convenient capsule option if you prefer not to take liquid oil.
Caveat: The manufacturer currently lists it as out of stock, so check availability.
4. Nordic Naturals Ultimate Omega-D3 Sport
Softgels · 2 daily
Omega-3s: 1,480 mg total.
Vitamin D3: 1,000 IU (25 mcg).
Why consider it: A higher-concentration omega-3 formula with NSF Certified for Sport verification, particularly useful for athletes who need sport-specific quality assurance.
Prices, availability, and formulations can change. Check the current Supplement Facts panel before purchasing.
How to choose the right one
Your priority
My starting point
Everyday wellness with a moderate vitamin D dose
Nordic Naturals Arctic-D
Want 2,000 IU vitamin D3 in a liquid
Carlson Super D Omega-3
Prefer capsules
Carlson Omega-3 + D, if available
Want a higher omega-3 concentration and sport certification
Nordic Naturals Ultimate Omega-D3 Sport
What to check before buying
EPA + DHA: Compare these individual amounts, not just the large “1,000 mg fish oil” number on the front. A few hundred milligrams of combined EPA and DHA is a reasonable everyday nutritional starting point for many adults.
Vitamin D3: Check how much you're already getting from multivitamins and other supplements. The right dose depends on your diet, age, and vitamin D status.
Independent testing: Look for credible third-party verification or a certificate of analysis covering potency, contaminants, and oxidation.
Cod liver oil caution: The first two products above are cod liver oil formulas, which can also contain vitamin A. Account for that if you take a multivitamin or other vitamin A supplement.
Safety note: Ask your healthcare professional before starting fish oil if you take blood thinners or have a heart rhythm condition. High-dose omega-3 supplementation has been associated with an increased risk of atrial fibrillation in some studies. Supplements also shouldn't replace prescribed heart medications or treatment for high triglycerides.
My recommendation
For general wellness, I'd start by comparing Nordic Naturals Arctic-D with Carlson Super D Omega-3. Their vitamin D doses differ by a factor of two, so the better choice depends on how much vitamin D you actually need.
One quick question that would help me narrow it down: Are you mainly looking to support general wellness, lower high triglycerides, or manage an existing heart-health concern? The best product and omega-3 dose can differ considerably depending on your goal.
If you want one daily supplement that combines vitamin D3 and omega-3 fatty acids, I’d look for a product that clearly lists its vitamin D dose and the amounts of EPA and DHA—the two omega-3s most commonly studied for health benefits.
For your goals of heart support and daily wellness, there are several good formats to consider: a standard fish-oil softgel, a flavored liquid or squeeze packet, or an algae-based option if you prefer to avoid fish. One important distinction: omega-3s may help lower elevated triglycerides, but taking a supplement doesn't automatically prevent heart disease in otherwise healthy adults.
My shortlist: vitamin D + omega-3 supplements
1. NOW Foods Tri-3D Omega
(Good all-in-one option)
A fish-oil formula combining vitamin D3 and omega-3s. An NIH supplement-label listing reports 900 IU vitamin D3 and 990 mg EPA plus 660 mg DHA per three-softgel serving. Check the current label, since formulations can change.
Best for: someone who wants a substantial amount of EPA and DHA in one daily formula.
2. Coromega Omega-3+D Squeeze
A flavored, single-serving alternative to swallowing softgels. The listed formulation provides 1,000 IU vitamin D3, 350 mg EPA and 230 mg DHA per packet.
Best for: convenience and people who dislike swallowing capsules.
3. Carlson Elite Omega-3 + D & K
A combination formula containing omega-3s, vitamin D3 and vitamin K2. The listed omega-3 amounts are 400 mg EPA and 200 mg DHA per serving.
Best for: someone interested in a three-nutrient formula. Note that vitamin K can interact with warfarin.
These are options to compare, not a ranking based on head-to-head clinical trials. Confirm current availability, serving size and label amounts before purchasing.
What to look for on the label
Nutrient
What I'd look for
Vitamin D3
A dose appropriate for your needs; 600–800 IU daily is the general recommended intake for many adults, depending on age.
EPA + DHA
The combined amount, rather than just the total fish-oil weight. Around 250–500 mg daily is a common general-wellness target when supplementing.
Quality
Independent testing or certification, clear ingredient sourcing and a reputable manufacturer.
Convenience
A softgel, liquid or packet you'll consistently take.
The NIH Office of Dietary Supplements provides additional information about omega-3 evidence and safety.
A few safety points
Take your supplement with a meal if that helps with stomach upset.
Avoid accidentally doubling your vitamin D intake across multiple supplements. The usual adult upper limit is 4,000 IU daily unless a clinician recommends otherwise.
Ask your clinician or pharmacist before using higher-dose omega-3s if you take blood thinners or have a heart rhythm condition.
If your main goal is treating high triglycerides, prescription omega-3 treatment is different from ordinary over-the-counter fish oil.
Combining omega-3 fatty acids (EPA and DHA) and vitamin D3 is a popular and effective choice, as both offer well-documented support for cardiovascular health, immune function, and general daily wellness. Furthermore, because omega-3s are fats, taking them alongside a fat-soluble vitamin like D3 can support optimal absorption.
Here are some top-rated, high-purity choices that combine both nutrients:
Nordic Naturals Ultimate Omega-D3 : Widely regarded as a gold standard in fish oil, this formula provides a high-intensity dose of total omega-3s (1,280 mg per serving, including high EPA and DHA) paired with 1,000 IU of vitamin D3 . It is third-party tested, wild-caught, and features a clean lemon flavor to avoid a fishy aftertaste. You can view details on the Nordic Naturals Ultimate Omega-D3 page.
Omega-3 Fish Oil + D3 : A triple-strength option providing 1,040 mg of total omega-3s and a robust 2,500 IU (62.5 mcg) of vitamin D3 per serving. It is certified sustainable by the MSC and third-party tested for purity (IFOS certified).
For heart health and general well-being, I’d look for a supplement that combines omega-3 fatty acids (EPA and DHA) with vitamin D3. The best choice depends on how much of each nutrient it provides, the quality of the product, and whether you actually need extra vitamin D.
One important distinction: omega-3s can help lower elevated triglycerides, but taking a supplement doesn't automatically prevent heart attacks. Vitamin D supports bone health, muscle function, and normal immune function, but taking extra vitamin D isn't proven to prevent cardiovascular disease in generally healthy adults.
My top choices
These are established brands with combination products that provide both nutrients. I’d compare them by the actual EPA/DHA content, vitamin D dose, and testing standards—not by the biggest number on the front of the bottle.
1. Nordic Naturals Ultimate Omega-D3
(Best overall pick)
Premium daily combination
1,280 mg total omega-3s per serving
Vitamin D3: 1,000 IU (25 mcg)
Made with wild-caught sardines and anchovies.
Good option if you want a concentrated, convenient formula.
Listed at $30.95 for 60 softgels on the manufacturer's website; check serving size and current price.
These are practical product options, not a clinical ranking proving that one brand produces better health outcomes than another. Formulas, stock, and prices can change.
What to look for on the label
Nutrient
What I'd look for
Omega-3s
Clearly listed EPA and DHA amounts, not just “fish oil 1,000 mg”
Vitamin D
D3 (cholecalciferol), with a dose that fits your needs
Quality
Independent testing for purity, potency, and freshness
Convenience
A serving size you can comfortably take every day
For a typical adult, 250–500 mg of combined EPA and DHA daily is a commonly used general nutritional range, though it isn't a proven heart-disease prevention dose. Adults generally need 600 IU of vitamin D daily through all sources up to age 70, and 800 IU after age 70. The appropriate supplement amount depends on diet, existing supplements, and individual needs.
Important safety notes
Don't take more just to get extra benefits. The general upper limit for vitamin D in adults is 4,000 IU daily from all sources unless a clinician recommends otherwise.
Ask your clinician or pharmacist before taking omega-3 supplements if you use blood thinners or have a history of atrial fibrillation. High-dose omega-3s have been associated with an increased risk of atrial fibrillation in some studies.
If your main goal is to lower high triglycerides or manage diagnosed heart disease, ask your clinician about treatment options; prescription omega-3 products are different from ordinary supplements.
Combining omega-3 fatty acids (EPA and DHA) with vitamin D3 is a great way to support cardiovascular health, bone density, immune function, and overall vitality . Because both nutrients are fat-soluble or best absorbed with dietary fats, taking them together in a single formulation is both convenient and effective.
Top choices that combine high-purity omega-3s and vitamin D3 include:
Nordic Naturals Ultimate Omega D3 : Widely considered a gold standard for purity and potency, this option delivers 1,280 mg of total omega-3s (including high levels of EPA and DHA) alongside 1,000 IU (25 mcg) of natural vitamin D3 per serving. It is third-party tested and sustainably sourced.
Sports Research Omega-3 Fish Oil + D3 : A high-potency choice featuring wild-caught Alaskan Pollock, delivering over 1,000 mg of omega-3s and a robust 2,500 IU of vitamin D3. Great if your blood work indicates you need a higher vitamin D boost alongside your fish oil.
Carlson Wild Norwegian Cod Liver Oil : If you prefer a traditional, single-source liquid or softgel, high-grade cod liver oil naturally provides omega-3s coupled with naturally occurring vitamins A and D3. Carlson is heavily awarded for its purity and freshness testing (IFOS certified).
Sports Research
Carlson The Very Finest Fish Oil + D3 : If you prefer a liquid supplement rather than swallowing softgels, Carlson offers an award-winning liquid Norwegian fish oil. A single teaspoon delivers 1,600 mg of omega-3s (including EPA, DHA, and DPA) plus 2,000 IU of vitamin D3 with a lemon taste.
NOW Supplements Ultra Omega 3-D™ : A budget-friendly yet high-potency choice that combines fish oil concentrate with 1,000 IU of vitamin D3. It is enteric-coated and formulated for cardiovascular and structural support.
If you'd like, let me know:
Are you looking for a softgel or a liquid format?
Do you have a specific dosage preference for Vitamin D3 (e.g., 1,000 IU vs. higher potencies)?
I can help narrow down which of these options best fits your daily routine.
Nature's Bounty Omega-3 + D3 Fish Oil : A budget-friendly, widely accessible option that combines standard fish oil dosages with 1,000 IU of vitamin D3 for daily general wellness.
Check the EPA/DHA breakdown: For heart health, look for a supplement providing a solid combined baseline of at least 250–500 mg of active EPA and DHA per day.
Look for third-party testing: Ensure the brand is certified by independent organizations like IFOS (International Fish Oil Standards), USP , or NSF International to guarantee it is free from heavy metals, PCBs, and other contaminants.
Take with a meal: Because omega-3s and vitamin D are fat-soluble, absorption is significantly higher when taken with a meal containing healthy fats.
If you'd like to narrow this down, let me know:
Are you looking for a liquid or a softgel capsule?
Do you know your current vitamin D blood levels or have a specific IU dosage in mind?
