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Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day

Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day

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  • 5. Supports cardiovascular risk reduction
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  • ✔️ Supports normal heart function with EPA and DHA omega-3
  • ✔️ Contributes to brain health and normal vision daily
  • ✔️ Provides vitamins A and D in one convenient capsule
  • ✔️ Suitable for adults not eating enough oily fish weekly
  • ✔️ Once-daily softgel — easy to swallow, no fishy smell

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What Is Seven Seas Cod Liver Oil One a Day?

 

If you're looking for a simple, no-fuss way to support your heart, brain, and joints, Seven Seas cod liver oil one a day is one of the most widely recognised omega-3 supplements available in the UK. Each capsule combines omega-3 fish oil with traditional cod liver oil, delivering EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), and the fat-soluble vitamins A and D — all in a single, easy-to-swallow softgel. You can find this and other trusted options in our vitamins and supplements collection.

Omega-3 fatty acids are considered essential because the body cannot produce them on its own — they must come from diet or supplementation. Oily fish like cod, mackerel, and salmon are the richest natural sources, but many people in the UK simply don't eat enough of them. That's where a once-daily capsule like this one can genuinely help fill the gap.

 

How Does Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil Work?

 

The active ingredients in this supplement work through several well-established biological pathways. Here's a quick breakdown of what each component does:

  • EPA (eicosapentaenoic acid): Helps maintain normal heart function and supports a healthy inflammatory response in the body.
  • DHA (docosahexaenoic acid): Contributes to the normal function of the brain and maintenance of normal vision.
  • Vitamin A: Supports normal immune system function, skin health, and vision — particularly in low-light conditions.
  • Vitamin D: Plays a key role in calcium absorption, bone health, and immune function. The NHS recommends that everyone in the UK considers a vitamin D supplement, especially during autumn and winter.

Together, these nutrients work synergistically. The omega-3 fatty acids are incorporated into cell membranes throughout the body, influencing how cells communicate and respond to inflammation. Vitamins A and D, being fat-soluble, are absorbed more efficiently when taken alongside dietary fat — which is why taking this capsule with a meal makes good sense.

 

Who Should Consider Taking This Supplement?

 

This product is suitable for most healthy adults who want to support their general wellbeing through daily omega-3 supplementation. It's particularly relevant if you:

  • Eat fewer than two portions of oily fish per week
  • Want to support normal heart and cardiovascular function
  • Are concerned about maintaining brain health and cognitive function as you age
  • Have low vitamin D levels, especially during the UK winter months

It is not intended to treat or cure any medical condition. If you have a diagnosed health condition — such as high triglycerides or cardiovascular disease — speak to your GP before starting any new supplement.

 

How Does This Product Compare to Other Omega-3 Supplements?

 

Feature Seven Seas Omega-3 + Cod Liver Oil One-a-Day Standard Fish Oil Capsule (Generic)
Omega-3 source Fish oil + cod liver oil blend Fish oil only
Added vitamins Vitamin A and Vitamin D included Usually none
Dosing frequency Once daily Often 2–3 capsules daily
Suitable in pregnancy No — vitamin A content is a concern Depends on formulation

 

Is This Supplement Suitable for Long-Term Use and How Should It Be Stored?

 

For most healthy adults, Seven Seas cod liver oil one a day can be taken as part of a long-term daily routine. Store the capsules below 25°C in a cool, dry place away from direct sunlight. Keep the pack tightly closed and out of reach of children. Do not use after the expiry date printed on the packaging.

If you're managing a chronic condition or taking prescription medicines — particularly blood thinners like warfarin — it's worth having a conversation with your pharmacist before starting. Omega-3 fatty acids can have a mild anticoagulant effect, and your pharmacist can help you weigh up the benefits and any potential interactions.

This product is a food supplement, not a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day specifications
Treatment category Omega-3 / Nutritional supplement
Mechanism of action Provides EPA and DHA omega-3 fatty acids plus vitamins A and D to support heart, brain, eye, and immune function
Effective for Supporting normal heart function, brain health, vision, and immune system
Suitable for Adults aged 18 and over (not suitable in pregnancy without medical advice)
Active ingredients Omega-3 fatty acids (EPA, DHA), Vitamin A, Vitamin D
Pack sizes Typically 30 or 60 capsules
UK classification Food supplement (not a licensed medicine)
Drug class Omega-3 fatty acid supplement
Preparation Softgel capsule
Route of administration Oral

Specifications of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day

 

What Is Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil and What Is It Used For?

 

Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day is a food supplement designed to help you maintain adequate intake of omega-3 fatty acids alongside vitamins A and D. It is used to support the normal function of the heart, brain, and eyes, and to contribute to healthy bones and immune function. It is not a treatment for any specific medical condition — rather, it helps bridge nutritional gaps in your everyday diet, particularly if oily fish isn't a regular part of your meals.

 

What Do You Need to Know Before Using Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

 

Before you start taking this supplement, there are some important things to be aware of. Please read the following carefully.

Do not take this supplement if you:

  • Are allergic to fish or shellfish
  • Are pregnant or trying to conceive — the vitamin A content may be harmful to an unborn baby; the NHS advises avoiding supplements containing vitamin A during pregnancy
  • Are already taking a multivitamin or other supplement containing vitamin A or D, as this may lead to excessive intake
  • Have been advised by your doctor to avoid omega-3 supplements

Possible interactions with other medicines:

  • Anticoagulants (e.g. warfarin, apixaban) — omega-3 fatty acids may enhance the blood-thinning effect; inform your GP or pharmacist
  • Other vitamin A-containing supplements — combined use may increase the risk of vitamin A toxicity
  • Orlistat (weight loss medicine) — may reduce absorption of fat-soluble vitamins including A and D

 

How Should You Use Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

 

Using this supplement correctly is straightforward. Follow these steps each day:

  1. Take one capsule daily — no more than one unless directed by a healthcare professional.
  2. Swallow the capsule whole with a full glass of water. Do not chew or crush it.
  3. Take it with a meal to improve absorption of fat-soluble vitamins and reduce the chance of a fishy aftertaste.
  4. Try to take it at the same time each day to build a consistent habit.
Indication Age Group Dose Frequency
General omega-3 supplementation Adults 18+ 1 capsule Once daily
Children under 18 Under 18 Not recommended — use age-appropriate formulation

If you are looking for additional support for your overall health routine, you might also find it helpful to explore our vitamins and supplements range for complementary products.

 

What Are the Possible Side Effects of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

 

Like all supplements, this product can cause side effects in some people, though not everyone experiences them. Most are mild and tend to settle with continued use.

Common side effects:

  • Fishy aftertaste or fish-scented breath
  • Mild nausea, particularly if taken on an empty stomach
  • Loose stools or mild diarrhoea
  • Burping or bloating

Less common side effects:

  • Skin reactions such as rash or itching — stop use and seek advice if this occurs
  • Headache
  • Altered blood glucose levels in people with diabetes — monitor carefully and speak to your GP

If you experience any signs of an allergic reaction — such as swelling of the face, lips, or throat, or difficulty breathing — stop taking the supplement immediately and seek urgent medical attention. People with diabetes who are monitoring their health closely may also wish to browse our diabetes monitoring products for additional support tools.

 

How Should You Store Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and heat sources
  • Keep the pack tightly closed after each use
  • Keep out of sight and reach of children
  • Do not use after the expiry date printed on the packaging
  • Do not store in the bathroom or near a sink — moisture can degrade the capsules

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Seven Seas cod liver oil one a day online in the UK?

You can buy Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £5.99. No prescription is needed, and it can be ordered alongside other products from our vitamins and supplements collection. Orders are dispatched promptly to your home address.

How does Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil work in the body?

The EPA and DHA omega-3 fatty acids in this supplement are incorporated into cell membranes throughout the body, where they support normal heart function, brain health, and vision. Vitamin D aids calcium absorption and immune function, while vitamin A supports skin, vision, and immune health. Together, these nutrients help fill dietary gaps for people who don't regularly eat oily fish.

How do I take Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day step by step?

Take one capsule daily with a full glass of water, swallowing it whole — do not chew or crush it. It's best taken with a meal to improve absorption of the fat-soluble vitamins A and D and to reduce the likelihood of a fishy aftertaste. Try to take it at the same time each day to make it part of your routine.

What is the best time of day to take Seven Seas cod liver oil one a day?

There is no single "correct" time, but taking it with your largest meal — often lunch or dinner — tends to work well for most people. Fat-soluble vitamins like A and D are absorbed more efficiently when consumed alongside dietary fat, so a meal-based approach makes practical sense. Consistency matters more than timing, so pick a time that fits your daily schedule and stick to it.

What are the side effects of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

The most commonly reported side effects are a fishy aftertaste, mild nausea, and loose stools — these are generally mild and often improve when the capsule is taken with food. Less commonly, some people experience burping, bloating, or a skin rash. If you notice any signs of an allergic reaction, stop taking the supplement and seek medical advice promptly.

Who should not take Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day?

This supplement is not suitable for people with a fish or shellfish allergy. Pregnant women or those trying to conceive should avoid it without medical advice, as the NHS warns that high vitamin A intake can harm an unborn baby. Anyone already taking a multivitamin containing vitamins A or D should also check with their pharmacist to avoid exceeding safe intake levels.

What happens if I miss a dose of Seven Seas cod liver oil one a day?

If you forget to take your capsule, take it as soon as you remember — unless it is nearly time for your next scheduled dose, in which case simply skip the missed one. Never take two capsules at once to compensate for a missed dose. Missing the occasional dose is unlikely to cause any harm, as omega-3 levels in the body build up gradually over time.

Can I take Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil with other medicines?

Omega-3 fatty acids can enhance the effect of anticoagulant medicines such as warfarin or apixaban, so if you are taking blood thinners, speak to your GP or pharmacist before starting this supplement. Orlistat, a weight loss medicine, may reduce absorption of fat-soluble vitamins A and D. Always inform your healthcare team of all supplements you are taking.

How long can you take Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil for?

This supplement can be taken as part of a long-term daily health routine for most healthy adults. If you have an underlying health condition or are taking prescription medicines, it is sensible to review your supplement use with your GP or pharmacist every few months. There is no standard maximum duration for healthy adults using it at the recommended dose.

Is Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil suitable for vegetarians or vegans?

No — this product is derived from fish and cod liver oil, so it is not suitable for vegetarians or vegans. If you follow a plant-based diet and want to supplement omega-3, look for algae-based DHA and EPA supplements instead, which provide the same fatty acids without any animal-derived ingredients. You can explore plant-friendly options in our vegan collection.

What are the alternatives to Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

Alternatives include other branded omega-3 fish oil supplements, pure cod liver oil liquids, or algae-based omega-3 capsules for those avoiding fish products. If you are pregnant, your midwife may recommend a pregnancy-specific omega-3 supplement that does not contain vitamin A. Speak to your pharmacist for personalised guidance on which option suits your needs best.

Does Seven Seas cod liver oil one a day help with joint pain?

Omega-3 fatty acids have been studied for their role in supporting joint health, and some research suggests they may help reduce morning stiffness and joint tenderness in people with inflammatory conditions. However, this supplement is classified as a food supplement, not a medicine, and is not licensed to treat joint pain or arthritis. If you have persistent joint pain, speak to your GP for a proper assessment.

What are the latest studies on omega-3 fish oil supplements?

Research continues to explore the cardiovascular benefits of omega-3 supplementation, with some large trials suggesting benefits for people at elevated cardiovascular risk, particularly at higher doses. The NHS acknowledges that eating two portions of fish per week — including one oily — is associated with heart health benefits. For most people, a once-daily supplement like this one is a practical way to support their omega-3 intake when dietary sources are insufficient.

Can children take Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day?

This specific product is formulated for adults aged 18 and over and is not recommended for children. Seven Seas produces separate, age-appropriate omega-3 and cod liver oil products designed for children, with adjusted doses of vitamins A and D. Always choose a product specifically labelled for your child's age group and consult your pharmacist if you are unsure.

How does Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil support heart health?

The EPA and DHA in this supplement contribute to the normal function of the heart, as recognised by the European Food Safety Authority (EFSA). Regular intake of omega-3 fatty acids is associated with maintaining healthy triglyceride levels and supporting normal blood pressure in some individuals. This supplement is not a substitute for prescribed heart medicines — always follow your GP's advice if you have a diagnosed cardiovascular condition.

How Should You Use Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day?

Using this supplement correctly is simple, but a few practical steps will help you get the most from it. Always read the label before starting and follow the instructions provided by the manufacturer.

What Is the Correct Dose of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day?

The recommended dose for adults is one capsule per day. This has been formulated to provide a meaningful contribution to your daily omega-3 intake without exceeding safe upper limits for vitamins A and D. Do not take more than the stated dose.

When Is the Best Time to Use Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day?

There is no single "best" time that applies to everyone, but taking this capsule with your main meal of the day is generally the most practical approach. Fat-soluble vitamins — including vitamins A and D — are absorbed more efficiently when consumed alongside dietary fat, so a meal-based routine makes good nutritional sense. Picking a consistent time each day, whether that's with breakfast or your evening meal, helps you remember to take it and builds a sustainable habit over time.

How Long Can You Use Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil One-a-Day For?

For most healthy adults, this supplement can be taken as part of an ongoing daily routine without a set time limit. Omega-3 levels in the body build up gradually, so consistent daily use over several weeks is needed before you may notice any benefit. If you have an underlying health condition, are taking prescription medicines, or are unsure whether long-term supplementation is right for you, speak to your GP or pharmacist for personalised advice.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

Most people tolerate this supplement well, but some do experience mild side effects — particularly when they first start taking it. These are usually temporary and tend to improve once your body adjusts.

  • Fishy aftertaste or fish-scented breath
  • Mild nausea, especially if taken on an empty stomach
  • Loose stools or mild diarrhoea
  • Burping or bloating

Taking the capsule with a meal is one of the most effective ways to reduce these effects. If a fishy aftertaste is particularly bothersome, try taking it at the start of your meal rather than at the end.

What Are the Less Common Side Effects of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

Less commonly, some people may notice the following. These are not experienced by the majority of users, but it's worth being aware of them.

  • Skin rash, itching, or hives
  • Headache
  • Altered blood glucose levels — particularly relevant for people with diabetes
  • Heartburn or acid reflux

If you notice a skin reaction or persistent digestive discomfort that doesn't settle within a few days, stop taking the supplement and speak to your pharmacist or GP.

What Are the Serious Side Effects of Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil?

Serious side effects are rare but can occur. The most significant risk is an allergic reaction, particularly in people with a known fish or shellfish allergy. Signs of a serious allergic reaction include swelling of the face, lips, tongue, or throat, difficulty breathing, a rapid heartbeat, or a sudden drop in blood pressure. If you experience any of these symptoms, stop taking the supplement immediately and call 999 or go to your nearest A&E department.

Excessive intake of vitamin A over a prolonged period can also cause toxicity. Symptoms of vitamin A toxicity include headache, nausea, dizziness, and in severe cases, liver damage. This is why it is important not to exceed the recommended dose and to avoid taking multiple supplements containing vitamin A simultaneously.

What Should You Do If You Experience Side Effects?

For mild side effects such as a fishy aftertaste or mild nausea, try taking the capsule with a larger meal or switching to a different time of day. If side effects persist beyond a week or two, or if they are affecting your daily life, stop use and consult your pharmacist. You do not need to visit a GP for mild, self-limiting symptoms, but your pharmacist can advise on whether to continue or switch to an alternative product.

Can Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil Interact With Other Medicines?

Yes — there are some clinically relevant interactions to be aware of. Omega-3 fatty acids can enhance the anticoagulant effect of blood-thinning medicines such as warfarin, apixaban, or rivaroxaban, potentially increasing the risk of bleeding. If you are taking any anticoagulant, inform your GP or pharmacist before starting this supplement. Orlistat, used for weight management, can reduce the absorption of fat-soluble vitamins including A and D, which may reduce the effectiveness of this supplement. Taking multiple vitamin A-containing products simultaneously may also increase the risk of vitamin A toxicity over time.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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