Vitamin D3 4000iu + K2
⏳ 12 months supply (365 tablets)
Boost your immunity, bone strength while improving your mood. Our max strength Vitamin D with K2 is formulated for superior absorption.
Vitamin D3 4000iu + K2
Nutrition Geeks works with accredited, independent laboratories to verify the quality and integrity of its products.
- Vitamin D3 (Cholecalciferol) Meets label claim 4000 IU/serving
- Vitamin K2 Meets label claim 100 mcg/serving
LAST TESTED JUN 22, 2026
Testing conducted by Marfleet Analytical Services
Third-party test results reflect laboratory analysis of the submitted sample at the time of testing and form part of Nutrition Geeks’ wider quality assurance programme.
☀️ Supercharge Your Immune System
Elevate your body's defence system with a daily dose of sunshine. Our Vitamin D3 is like a burst of sunlight in tablet form, empowering your immune response to keep you healthy and resilient.
🦴 Strengthen Bones
Coupled with Vitamin K2, our formula ensures that calcium is effectively directed to where your body needs it most—your bones. This also prevents calcium depositing in your arteries and blood vessels.
💪 Support Muscle Function
Vitamin D3 isn't just for bones; it also plays a crucial role in muscle function, supporting your active lifestyle and helping you stay fit and toned.
😁 Maintain Healthy Teeth
Keep your smile strong and bright. Vitamin D3 aids in the maintenance of tooth integrity, giving you another reason to show off your pearly whites.
💡 Synergistic Combination
Our blend of Vitamin D3 and K2 ensures enhanced absorption and efficacy for calcium distribution and bone health.
🔬 Micro Tablet Magic
Each 6mm micro tablet is packed with high-strength ingredients, delivering a year's supply of health in a tiny package. You’ll also never struggle again with swallowing these vitamins. It's convenience and efficacy combined.
Vitamin D3, 100μg (4000iu), 2000%
Vitamin K2 (MK-7), 100μg, 133%
Ingredients:
Plant-Based Binding Agent: Microcrystalline Cellulose, Vitamin D3 (Cholecalciferol), Vitamin K2 Menaquinone-7, Plant-Based Anti-Caking Agent: Magnesium Stearate.
Suitable for vegetarians but not suitable for vegans.
* Nutrient Reference Value AKA Recommended Daily Intake
Supply: Each pack contains 365 tablets (12 months supply) of Vitamin D3 4000iu + K2.
Cost per serving: 3p
Directions: Take 1 tablet daily with a glass of water. Not intended for use by persons under the age of 18.
All UK orders qualify for fast and free tracked UK delivery.
Delivery takes 1-2 days.
Please review our delivery policy for full delivery details.
As Featured In
Why are customers switching to Nutrition Geeks Vitamin D3 + K2
Discover why millions of customers are switching to Nutrition Geeks from other brands.
- 5 stars: 933 (90%)
- 4 stars: 57 (5%)
- 3 stars: 16 (2%)
- 2 stars: 9 (1%)
- 1 star: 23 (2%)
I bought the Vitamin D3+K2 supplement last year for my daughter (She had a vitamin D deficiency). Now her test result is excellent! I strongly recommend this to everyone.
Please can nutrition geeks design vitamins to address issues with childern at schools pre teens, teens specifically targeting issues around concentration, poor diet,anxiousness and brain functioning in terms of cognitive development focus issues....
Ordered a replacement packet in the morning and was very surprised to get it the same afternoon! Product is one of a few nutrition geek items I use and collectively they do make a difference. Thanks for making a difference geeks!
I was happily taking them when I learnt that if you are taking Anti-Coags (blood thinners) you should consult your doctor first as they don't always interact well
Great products! Excellent value! Optimal combination of Vitamin D3 and K2.
Micro tablet size is perfect.
Amazing customer service! Delivered next-day. Efficient packaging. Letterbox friendly.
Exceptional company, very helpful and knowledgeable staff.
Highly recommended! 10/10.
Just received my first box !! Can't wait to start taking these ... Am hopeful they will help with my tiredness, achy body , hair falling out , lack of sleep.. the list goes on ..!! Great interaction and speedy replies fromthe nutrition geeks.. and super fast delivery. Will update once I've been taking these bad boys for a while .. :)
Received my Geeks vitamin D3+K2,disappointed that no recommended dose on packaging , had to research and still not sure. Very pleased with fast delivery and packaging.
very good
Hi there,
Thank you for your positive feedback. We're glad to hear you are satisfied with our Vitamin D3 + K2 supplement.
Kind regards,
Nutrition Geeks
Excellent
Fantastic product, which arrived quickly after ordering and was well packaged. Easy to take each day and package has lots of interesting relevant information on the back of it.
Hi There,
Thank you for sharing your positive experience with our Vitamin D3 4000iu + K2. We're glad to hear it arrived quickly and that you find the packaging informative and easy to use. Your feedback is appreciated!
Kind regards,
Nutrition Geeks
Excellent product as usual
Fantastic
Great
Haven't tired this before so hopefully very good
Love this
Cracking stuff as always
Nutrition Geeks offered these vitamins on a one time limited offer, after I had paid for another order. I snapped them up immediately for only £3.99. The delivery and service was excellent as always. The Vitamin D3 4000iu K2 supplements being higher than my regular dose, will fit my taking during the winter months. I haven't used them so far, but I expect they'll suit my needs.
Hi There,
Thank you for sharing your positive experience with our Vitamin D3 4000iu + K2. We're glad to hear that our service has met your expectations and that the supplement will be helpful during the winter months.
Kind regards,
Nutrition Geeks
Suoer fast delivery thank you
Perfect 👌
Speedy delivery, great service
Just starting on a healthy living routine and these are amazing
Hi there, Thank you for your lovely review. We're delighted to hear you're enjoying our Vitamin D3 + K2 as part of your new healthy living routine. Wishing you all the best on your journey, and thank you for choosing Nutrition Geeks.
Regards,
Nutrition Geeks
Promptly deliivered
Great value for money
Cheers
Been taking these 2 years now wouldnt be withoit them
Great service
Excellent company great vitamins
I love everything that Nutritional Geeks stand for, ethical and honest. As a woman of colour I take these vitamin D+ tablets every day.
Hi There,
Thank you for sharing your kind words and for trusting Nutrition Geeks. We're grateful to be part of your daily health routine and appreciate your support.
Kind regards,
Nutrition Geeks
Frequently Asked Questions
Common questions about Vitamin D3 4000iu + K2What are common symptoms of Vitamin D deficiency?
Vitamin D deficiency is common, especially in regions with limited sunlight exposure or for individuals who spend most of their time indoors.
A deficiency in vitamin D can lead to a range of symptoms, such as persistent fatigue, bone pain, muscle weakness, and mood changes, all of which can significantly impact a person's quality of life.
Fatigue may reduce the ability to concentrate and perform daily tasks, leading to a decrease in overall productivity and well-being.
Bone pain and muscle weakness can make physical activities more difficult and uncomfortable, potentially limiting mobility and causing a loss of independence.
Additionally, mood changes such as irritability, anxiety, or even depression may strain personal relationships and diminish one's sense of mental and emotional balance. Over time, these symptoms may reduce an overall enjoyment of life and ability to engage in everyday activities.
The National Health Service (NHS) in the UK recommends that everyone consider taking a daily vitamin D supplement, particularly during the autumn and winter months. If you're unsure, a healthcare professional can perform a simple blood test to check your vitamin D levels and determine if supplementation is necessary.
Which vitamin D product is right for me?
Choosing the right vitamin D supplement can be confusing given the various options available. Here's a brief overview of each to help you decide:
Vitamin D3 1000iu: This is a standard option providing the daily amount of 1000iu of Vitamin D3. It's suitable for general maintenance and support of overall health.
Vitamin D3 4000iu: If you're looking for a higher potency supplement, this option contains 4000iu of Vitamin D3 per serving. Some individuals with specific health concerns can benefit from this dosage
Vitamin D3 4000iu+K2: This combines 4000iu of Vitamin D3 with Vitamin K2, which supports optimal calcium absorption and utilisation in the body. The combination of D3 and K2 can offer additional benefits for bone and heart health.
For each person the amount of Vitamin D required could vary (both higher and lower dosage) depending on how much time they spend out in the sun, as well as their skin colour (if you have darker skin, you absorb less Vitamin D outside).
If you are interested in Vitamin D3+K2 and feel that the 4000iu strength is too high, there is an option to spread taking them once every four days instead of daily. This approach can be effective because Vitamin D3 and Vitamin K2 are fat-soluble, meaning it can be stored in the body's fat tissues and liver for future use. Therefore, it doesn't necessarily need to be replenished every day like water-soluble vitamins (e.g., Vitamin C, B vitamins).
Can children take Vitamin D3 Max Strength 4000IU tablets?
The Department of Health and Social Care in the UK recommends that adults and children over 4 years old should take a daily Vitamin D supplement containing 400IU. It's important to note that the required amount of Vitamin D may vary for each individual, depending on factors such as sun exposure and skin color. Those with darker skin tend to absorb less Vitamin D from sunlight.
For children aged 9 and above, a dose of 1000IU of Vitamin D3 can be appropriate and safe, with the option to adjust the frequency, such as once every other day during summer months.
Our Vitamin D3+K2 supplement is of higher strength (Vitamin D3 4000IU and Vitamin K2 1000IU). 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.
Moreover, according to the NHS, taking 1000IU or less of vitamin K supplements a day is unlikely to cause any harm.
However, we strongly recommend consulting your GP or pharmacist for personalised advice based on the child's medical history.
How does the combination of Vitamin D3 and K2 work?
Vitamin D3 and K2 work synergistically to optimise calcium metabolism. Vitamin D3 increases calcium absorption in the intestines, while Vitamin K2 directs the calcium to the bones and prevents it from depositing in the arteries and blood vessels. This combination ensures that your body uses calcium effectively, supporting both bone health and cardiovascular health.
Can Vitamin D3 4000iu + K2 be used alongside other products or medications?
Vitamin D3 can interact with several types of medications, including steroids and weight loss drugs. It can also affect calcium levels, so it's important to monitor if you're taking calcium supplements or medications that affect calcium levels.Vitamin K2 can also interact with anticoagulant medications.
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