4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2
4000IU Vitamin D3 + K2

4000IU Vitamin D3 + K2

This formulation ensures optimal calcium absorption while promoting strong bones and a healthy heart.

Supports Bone Health Boosts Immune Function Supports Muscle Recovery
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Pairs Well With

Creatine Monohydrate (30 pack)
Creatine Monohydrate (30 pack)
£25.00
Description

This supplement is designed to support bone health, immune function, and cardiovascular health, featuring 4000 IU of Vitamin D3 sourced from marine algae and 100mcg of Vitamin K2. This formulation ensures optimal calcium absorption while promoting strong bones and a healthy heart. Suitable for vegans, this product is ideal for athletes looking to maintain peak performance.

Key benefits

We created the Vitamin D + K2 supplement for athletes and individuals who may be deficient in these essential vitamins. Low Vitamin D levels can impact muscle recovery, bone strength, and immune function. With this product, we aim to ensure that athletes and active individuals are provided with a high-quality, plant-based Vitamin D3 and K2 formula, tailored for their needs.

Ingredients list

Vitamin K2 (MK-7) 100mcg
Supports bone strength and heart health by directing calcium to the bones and away from arteries.

Hydroxypropyl Methylcellulose (HPMC)
Empty capsule shell

Bamboo Silica 2%
Supports healthy hair, skin, nails, and connective tissue by promoting natural collagen production and strength.

Brown Rice Flour
Allergen warning: May contain soya.

Frequently asked questions

Who should take Vitamin D3?
Vitamin D3 + K2 is ideal for anyone with limited sun exposure, active lifestyles, plant-based diets, or those wanting to support strong bones, heart health, and immunity.

How long will it last?
60 capsules per jar - 60 day supply

How long until I notice the benefits of Vitamin D3?
Time taken to feel the benefits of this product differ between individuals. Benefits of taking Vitamin D3 are usually felt from between 4-12 weeks of consistent use.

How to take

For optimal results, take 1 capsule daily with water, preferably in the morning. Athletes should consider regular supplementation, especially during the winter months or periods of reduced sun exposure.

Our Vitamin D3+K2 supplement is of higher strength (Vitamin D3 4000IU). If you find the 4000IU strength too high, you can opt to take them once every 2-3 days instead of daily. This approach can be effective because both Vitamin D3 and K2 are fat-soluble, meaning they can be stored in the body's fat tissues and liver for future use.

Shipping and returns

Free UK Shipping on subscriptions and orders over £50.

100% PERFORMANCE GUARANTEE. Not right for you after 30 days? No problem, we'll refund you.

Unopened products can be returned within 21 days of delivery for a full refund.

Please reference our Shipping and Returns page here for more information or contact us at contact@puresport.co with any queries

Customer Reviews

Overall rating: 4.9 / 5 from 38 reviews.

D3 k2 Will always recommend puresport products for their clean ingredients and effectiveness

Laura H. 5/5 Verified

Great results and easy to swallow, Excellent formulation, I love that this formula includes K2 because it ensures the calcium gets directed straight to my bones. The product arrived quickly and the package came completely sealed.

Rinih A. 5/5 Verified

Great

Luke H. 5/5 Verified

Great product

Gemma H. 5/5 Verified

Do the trick Been using for 5 months and they seem to do the trick. Take alongside a multivitamin and I’ve not had any form of illness which I used to struggle with.

Liam C. 5/5 Verified

Lovely

Kyle H. 5/5 Verified

The Vitamin D Refill is a great product, it’s a convenient, eco-friendly solution that I’d definitely recommend to anyone already using their vitamin D products. I also like how practical the packaging is it’s lightweight, easy to store, and simple to pour into the original container.

Leah P. 4/5 Verified

Great quality product. Subscribe to them and take then everyday of the month. Goes great with magnesium

Katie T. 5/5 Verified

Best out there in the market in my opinion and with the subscription, it makes it really affordable

Adam B. 5/5 Verified

Only been on them a month, but I feel a difference in my energy levels. . found myself having more energy than the children haha

Ashley M. 5/5 Verified

Very effective, feel more energised since combining with my magnesium from pure sport. Recovery has been quicker and fuller, less fatigued too

Kieron R. 5/5 Verified

Great. Really helping me with my training. My body feels strong and training more consistently.

Jona E. 5/5 Verified

Like the fact it includes K2

Carolyn W. 5/5 Verified

great product, high dose at a good price on subscription. Easy on the stomach and bowels

D 5/5 Verified

Excellent product to help boost immunity!

Savan P. 5/5 Verified

Vitamin D I need Vitamin D and what's great is there is Vitamin D and Beetroot in each capsule. So it combines both recovery and added nutrients.

Andrew T. 5/5 Verified

Vitamin D I need Vitamin D and what's great is there is Vitamin D and Beetroot in each capsule. So it combines both recovery and added nutrients.

Andrew T. 5/5 Verified

The vitamin D3+K2 has been a lifesaver for me. Having access to a supplement which improves my absorption of D3 has improved my wellbeing this winter. I am currently recovering from a running injury and vitamin D helps me make it through the day, keeping my energy levels high and helps to keep the negative thoughts at bay. The subscription means I am always stocked up which alleviates anxiety too.

Rosie M. 5/5 Verified

Highly recommend Just great to get a good quality vitamin D and K together. Definitely recommend.

Cathy B. 5/5 Verified

I always top up on my vitamin D, but doubly when we head into our winter months. Puresport's is the best version around.

Sara F. 5/5 Verified

Essential over UK winters! I especially like the Puresport vitamin D because it’s a really high dose compared to a lot of other brands.

Anita N. 5/5 Verified

Great product A great product for athletes particularly in winter. I’m sure many of our athletes will be using it.

Catherine M. 5/5 Verified

Great product, part of my daily stack from puresport. Pair this up with the raspberry salt electrolytes sachets.

Gareth H. 5/5 Verified

I love the product so far. I take one every morning and very easy to take! Would recommend to anyone, especially those in the UK during the darker months!

Ross T. 5/5 Verified

Bone strength in an older runner As I have reached 70yrs and have been running for 60 of those, I am aware of bone health. This product I feel is helpful.

Mike G. 5/5 Verified

Don't know what I'm meant to feel from it

Lee R. 4/5 Verified

Been taking this a good couple of months now and feel strong and full Of energy. Subscription makes it easier.

Vanessa C. 5/5 Verified

VIt D3 Great product, they’ve made a difference to my overall health.

Tom S. 5/5 Verified

I really appreciate that the first order came in a glass jar and the refills come in a small plastic bag. The subscription service is so convenient. I don’t have to think about it and I never run out. It makes me feel like I am taking something safe and clean due to its NSF certification. I live in a cloudy winter environment. I am also post-middle-aged and my bones are healthy. I am sure supplementation of D3 helps.

Denise V. 5/5 Verified

Amazing product and definitely getting the benefits as I head towards my first half marathon!!

Robbie M. 5/5 Verified

A no-brainer daily supplement A high-quality Vit D + K2 supplement that covers all your daily needs. Given it is 4000IU, I find it sufficient to take every alternate day- which makes this as affordable, but far higher quality, than traditional OTC Vit D supplements. Highly recommend.

Prisha 5/5 Verified

Quality product I'm a new customer to Puresport. Products and service are both high quality. After a dreary few months, the additional D2 is definitely making a difference

Martyn 5/5 Verified

High quality I always use Puresport for my supplements - they're the highest quality on the market

Faye 5/5 Verified

Increased energy levels Lack of sun currently in the UK, these are definitely helping

Sam 4/5 Verified

4000IU Vitamin D3+K2 Review 4000IU Vitamin D3+K2 after purchasing for the first time the product has improved my performance and recovery. I've never felt as good when training and racing.

Cam B. 5/5 Verified

Now Subscription Customer Bought these for the dull grey UK winter months, my immune system isn't great so was worth a try. Although I have been ill a couple of times since taking these I feel like they drastically reduced the symptoms and kept my immune system fighting. Highly recommend taking these whilst that pesky sun is hiding away! 10/10

Seth 5/5 Verified

FEEL THE BENEFIT Can really feel the benefit of this stuff, recommend to my family it's top notch

Shaun 5/5 Verified

Wonderfully effective Have seen noticeable improvement in shin splints, and recovery time from illness in the 6 weeks I've been taking it.

Rahat 5/5 Verified

Only what you need, nothing you don't

Close-up of green seaweed with water droplets on a dark background

Vitamin D3

Vitamin D3 sourced from marine algae, supports immune function, bone health, and recovery from intense exercise.

Person wearing brown shorts and white socks running on a treadmill

Vitamin K2 (MK-7)

Vitamin K2 works synergistically with Vitamin D3 to ensure calcium is deposited into bones, reducing the risk of arterial calcification.

Close-up of a person's face with wet hair, sunlit skin

Immune Function

Supports immune health by enhancing immune response and promoting proper calcium balance.

STRONGER BONES, FEWER SESSIONS MISSED.

More daylight, deeper into the winter.

4000IU of vegan D3 from marine algae, plus 100mcg of K2 (MK-7) - one capsule a day from the clocks going back to the clocks going forward.

One capsule. That's the whole routine.

One capsule with breakfast D3 and K2 are fat-soluble, so food is all the help they need. 60 servings a jar, two months of not thinking about it.

The calcium you absorb, where it belongs.

Taken daily across 4–12 weeks it supports bone strength, immune function and muscle function

MADE IN UK
Gluten Free
Vegan
Certified

Trusted by the Best

Us vs Them.
How We Stack Up.

PURESPORT
OTHER BRANDS
High Strength formula with 4000IU
Sourced from marine algae
Informed Sports Certified
Vegan
No sugar, no fillers, no artificial ingredients
Informed Sport Certified
4000 IU
Vegan
No Preservatives

Why do I need vitamin D3?

Vitamin D3 supports bone strength, immune defence, muscle function and mood — yet most of us run low, especially through the darker months when sunlight is scarce

How does it work?

Vitamin D3 helps your body absorb calcium, while the added K2 directs that calcium into your bones and away from your arteries - keeping your skeleton strong and your heart healthy.

When do I take it?

 Daily with water, ideally in the morning alongside food. Both D3 and K2 are fat-soluble, so they absorb best with a meal.

Why Puresport?

Many vitamin D products use low doses or skip K2 entirely. Ours pairs 4000IU of vegan, marine-algae D3 with 100mcg of K2 (MK-7) in one Informed Sport certified capsule — so the calcium you absorb actually ends up where it should.

Backed by Experts

Vitamin D is one of the supplements I think many athletes should take seriously, especially through winter or during periods of limited sun exposure. It contributes to normal immune function, muscle function and bone health, and Puresport’s D3 + K2 provides a high-strength, plant-based option for keeping intake consistent.

Dr Jamie Pugh

MD, PHD

Science Advisor | MIT Sloan

More Questions?

  • Vitamin D is essential for bone strength, immune defense, mood balance, and muscle function. It helps your body absorb calcium and phosphorus, making it vital for bone density and overall skeletal health. Many people also take Vitamin D to support immune resilience and reduce seasonal fatigue.

  • Yes. Vitamin D3 4000IU is the established safe upper limit for daily Vitamin D3 intake in healthy adults. This dosage is often recommended for people with low Vitamin D levels or limited sun exposure. If you find the 4000IU strength too high, you can opt to take them once every 2-3 days instead of daily. This approach can be effective because both Vitamin D3 and K2 are fat-soluble, meaning they can be stored in the body's fat tissues and liver for future use. We would recommend consulting a doctor before consuming other products also containing Vitamin D3.

  • Vitamin D3 supports calcium absorption, but without Vitamin K2, that calcium may deposit in soft tissues like arteries instead of bones. Adding Vitamin K2 helps direct calcium into your bones and teeth, supporting strong skeletal health and reducing the risk of arterial calcification. This combination is considered more effective for bone and heart health than Vitamin D3 alone.

  • Common signs of low Vitamin D include:

    • Fatigue or low energy
    • Frequent colds or infections
    • Bone or muscle pain
    • Mood changes, including low mood or irritability
    • Slow wound healing

  • You may be at higher risk if you:

    • Live in areas with limited sunlight (especially in winter)
    • Spend little time outdoors
    • Are over 50 years old
    • Follow a strict vegan diet

    In these cases, supplementation with Vitamin D is often recommended. Most people notice improvements in energy and mood within a few weeks after taking our Vitamin D3, but it may take 2–3 months of consistent use to restore Vitamin D levels to an optimal range. Regular blood tests can help track your progress.