We think of Vitamin D and omega-3 as brilliant basics, the essential foundations of your health. They make up two-thirds of a supplemental trio we refer to as the capsule wardrobe, the holy trinity of health, if you like. Vitamin D is best known for supporting your immune system in fending off the lurgies and helping you feel generally good, right down to your bones. Omega-3 has over 50,000 studies to its name, which is why we call it the GOAT of health, happiness, and good living. Fish oil provides the building blocks for the cells in your brain, heart, and eyes, while also helping to regulate inflammation throughout the body. Great. So can we take them together? The short answer is, of course you can.
Ok. So can I take omega 3 with vitamin d?
Put it this way, these are the essentials we recommend to everyone, in our eyes, you’d be silly not to, frankly. Taken correctly, they are generally considered very safe. Omega-3 has been studied in thousands of research studies across populations of all ages, shapes, and sizes. Vitamin D levels are routinely screened by GPs in the UK (where the sun is less than routine) because so many of us are low, with women twice as likely to be deficient.
Whilst their benefits are well documented, as with all supplements, they can pose risks if taken incorrectly or at excessively high doses. We’d recommend following the NHS guidance on vitamin D and the European Food Safety Authority guidelines for omega-3 intake.
It’s also worth remembering that official guidelines are designed for the general population, and focus mainly on preventing deficiency, rather than optimising longer-term health goals. Some researchers and clinicians argue that much higher doses may be beneficial in certain cases. If you’re unsure, ask your doctor or a health expert. We’ve got some guides to dive into, here, too.
Why take them together?
The fundamental reason we’d recommend pairing these two is simple: a large proportion of the UK population falls below optimal omega-3 levels, and adults over 40 in the UK have a 47.5% chance of being low in vitamin D, with women twice as likely to be severely deficient.
Individually, these essential nutrients have a vast body of research behind them, particularly around long-term health and healthy ageing. They do different things in the body. Together, strangely, there’s little evidence that they interact synergistically.
One longitudinal study, the DO-HEALTH trial, investigated the effects of vitamin D and omega-3 together with exercise over five years. The team monitored biomarkers for healthy ageing, bone health, cognition, and risk of cancer. The trial did not demonstrate strong or consistent synergistic effects between vitamin D and omega-3 alone. Still, the authors of several analyses of the data suggest that vitamin D, omega-3 and exercise may contribute to aspects of healthy ageing.
Our advice has been the same for a long time now: If you want to keep things simple, start with this pair.
How do omega-3 and vitamin D work in the body?
Vitamin D3 and omega-3 together support some of the most important systems in the body, including the brain, heart, and immune system, but they work in very different ways, which is why they each have very different jobs. In very basic terms, omega-3 essential fatty acids (EFAs) are some of the essential building materials the body uses to grow, repair, and function. Think of them like aggregate and cement. We call them “essential” because the body can’t make them on its own, so we need to get them from food or supplements.
The two most important omega-3 fats are EPA and DHA. DHA is more structural; it’s the physical stuff your body is built from. It helps build and maintain the membranes that surround cells, especially in the brain and eyes. EPA is a bit more… wifi magic. It works more on the signalling side, helping regulate the chemical messages cells send, especially those involved in inflammation and immune responses. If you want to learn more about the benefits of omega-3, read our expert guide.
Vitamin D works differently. It’s often called the "sunshine vitamin" because the body makes more of it through exposure to sunlight. But it behaves more like a hormone because of the wide range of processes it helps regulate. One of its biggest jobs is helping the body absorb calcium from the food we eat, which is essential for maintaining strong bones and teeth. But we’re also learning more about its role in immune function, mood and muscle strength. Research suggests that people with low vitamin D levels may be more likely to get sick and may take longer to recover from illness. For more on vitamin D, read on.
Is there a ‘best’ way to take omega-3 and vitamin D?
Not really. These two nutrients are fairly easy-going when it comes to their care instructions. Both are generally safe to take alongside other vitamins and minerals, and technically, they can be taken at any time of day that suits you. That said, both omega-3 and vitamin D are fat-soluble nutrients, which means they are better absorbed when taken with food.
Some experts like Rhonda Patrick suggest taking vitamin D in the morning, as a small amount of research indicates it may influence melatonin production and sleep in folks who are sensitive to it. Omega-3 is also thought to be better absorbed when taken with larger meals. The good news is that our Beam & Balance vitamin D is made with a MCT oil to help support absorption, while our omega-3 comes in a triglyceride form, which is easier for the body to absorb and use.
If you’re not deficient in either nutrient, a combined supplement like our Rise & Shine omega-3 with vitamin D3 is a super-efficient way of getting a 2-4-1 on these two nutrient big hitters in one sitting. But if you know you’re low in either, you’d be better off dosing separately with either a high-strength omega-3 or vitamin D (we know a brand).
The bottom line is that consistency is more important than anything!
Are there any risks or side effects?
Like all supplements, it’s always worth being cautious if you have an underlying health condition, regularly take medication, are pregnant or suspect you may have a nutritional deficiency. If in doubt, speak to your GP or healthcare practitioner before starting any new supplement routine.
One of the main cautions around omega-3 and vitamin D concerns blood-thinning medications like warfarin. This is because vitamin K, which is included in some vitamin D formulations, such as our Beam & Balance, can affect how certain anticoagulant (blood-thinning) medications work.
Omega-3 has also been associated with mild blood-thinning effects, although major health organisations and industry bodies reviewing the evidence, including GOED, generally consider omega-3 supplements safe when taken at recommended doses. We’d suggest that if you take medication that affects blood clotting, it’s always best to check with your doctor first. You can read in more detail here in our expert omega-3 guide.
For most people, though, omega-3 and vitamin D are considered safe. They remain two of the most well-researched and widely used nutrients. While scientists are investigating how they work together, evidence suggests they may support healthy ageing and everyday wellbeing when combined with a healthy lifestyle.
The dream combination for a long and healthy life might not be gin and tonic after all, but this pair. We take them every day, and tell just about anyone who’ll listen to do the same.
