4.6 |
Vitamin D3 Complete
£19.99
Most D3 stops at K2. We go further.
4000 IU vitamin D3 - properly dosed, not underdosed
Designed as a system - not just D3 + K2, the full cofactor formula
Vitamin K2 (MK-7) - helps direct calcium into bones, not soft tissue
Magnesium - needed to convert vitamin D into its active form
Zinc - helps vitamin D work effectively inside your cells
Boron - helps keep vitamin D active in the body for longer
The Barefoot way - bioactive forms, no fillers or binders, clean pullulan capsules, UK-made, GMP & HACCP certified
Frequently bought together
Vitamin D3 Complete
Every Ingredient Carefully Chosen
Every ingredient in our formula is there for a reason—and backed by peer-reviewed research, not marketing fluff. We don’t hide behind “proprietary blends” or vague labels. You get a clear, transparent list of clinically supported ingredients—each included at a meaningful dose.
Vitamin D3
The active form your body uses. Works with the other nutrients in this formula to support strong bones, immunity and overall health.
Vitamin K2
Directs calcium to the bones where it's needed, working with vitamin D3 to support bone strength and heart health.
Magnesium Glycinate
Activates vitamin D3 in the body and supports its conversion so it can be used effectively.
Zinc Picolinate
Essential for the enzyme that activates vitamin D3 and supports immune function and bone health.
Boron Citrate
Helps vitamin D3 stay active for longer and supports calcium and magnesium metabolism.
Pullulan Capsule
100% natural, plant-based capsules with no unnecessary extras.
What Sets our Vitamin D3 Apart?
4000 IU Vitamin D3
Properly dosed, not underdosed.
Designed as a System
Not just D3 + K2, the full cofactor formula.
Vitamin K2 (MK-7)
Helps direct calcium into bones, not soft tissue.
Magnesium
Needed to convert vitamin D into its active form.
Zinc
Helps vitamin D work effectively inside your cells.
Boron
Helps keep vitamin D active in the body for longer.
The Barefoot Way
Bioactive forms, no fillers or binders, clean pullulan capsules, UK-made, GMP & HACCP certified.
Customer Reviews
Tina,
Verified Buyer
Always buy this product, has everything you need and nothing you don’t. Excellent quality.
Peter,
Verified Buyer
Good balance of ingredients. According to what we read, the ingredients in this supplement are the correct combination for efficacy.
Laura,
Verified Buyer
Another essential, especially in the winter.
David,
Verified Buyer
Excellent product. My go to brand because of the additional minerals for efficacy. Ethical company. Worth the price. Lovely brown glass bottle to prevent spoilage and recyclable. Good strength Vit D3 with added K2 for better absorption. Highly recommended in my humble opinion.
Why Choose Barefoot Nutrition?
Why Choose Barefoot Nutrition?
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BAREFOOT NUTRITION
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TYPICAL BRANDS
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Bioactive forms
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Optimised absorption
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No artificial fillers or additives
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Healthful dosing
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Tested & certified
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100% natural capsules
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60 Day Money Back Guarantee
Don't feel the difference within 60 days? We'll refund you. No questions asked.
Frequently Asked Questions
Why choose Barefoot Nutrition D3 Complete?
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Because taking vitamin D on its own isn’t enough.
Barefoot Nutrition D3 Complete combines 4000IU vitamin D3 with the key cofactors your body needs to use it properly — all in highly bioavailable forms:
- Vitamin K2 (MK-7)
- Magnesium (glycinate)
- Zinc (picolinate)
- Boron
We haven’t seen another formula that brings all of these together in one capsule — it’s designed as a complete D3 system, not just a standalone vitamin.
What makes this better than standard vitamin D supplements?
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Most vitamin D supplements:
- Contain D3 alone
- Ignore the nutrients needed to activate and direct it
Barefoot D3 Complete is different:
- 4000IU D3 (a strong, effective daily dose)
- Cofactors included for absorption and utilisation
- Bioavailable forms for better uptake
So your body can actually use the vitamin D you’re taking.
What do the cofactors actually do?
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Each one plays a key role in how vitamin D works in the body:
- Vitamin K2 (MK-7) → helps move calcium out of the bloodstream and into bones, where it’s needed
- Magnesium → required for the enzymes that convert vitamin D into its active form (calcitriol) and supports its function in the body
- Zinc → supports vitamin D receptor activity, helping cells respond properly to vitamin D
- Boron → helps regulate vitamin D metabolism and supports calcium and magnesium balance
Without these, vitamin D can be less effective or poorly utilised.
What are the benefits of taking Barefoot Nutrition D3 Complete?
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Designed to support:
- Bone health and calcium balance
- Immune system function
- Muscle function
- General wellbeing
Particularly useful in the UK, where vitamin D deficiency is very common due to limited sunlight.
Who is this best for?
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Ideal if you:
- Live in the UK or get limited sun exposure
- Have a darker skin tone (which can reduce vitamin D production from sunlight)
- Want to support bone and immune health
- Prefer a complete vitamin D formula with cofactors
- Don’t want to take multiple separate supplements
Should I take vitamin D all year round in the UK?
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For many people, yes.
In the UK, sunlight is only strong enough for meaningful vitamin D production during the spring and summer months. For the rest of the year, levels can drop.
That’s why many people choose to supplement year-round, especially if they:
- Spend a lot of time indoors
- Live in northern regions
- Have darker skin
How much should I take?
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Take 1 capsule daily, providing 4000IU vitamin D3.
This is a healthful, effective dose designed to support optimal levels.
How long does one bottle last?
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Each bottle contains 60 capsules, giving you a 60-day supply.
Is this a clean, high-quality supplement?
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Yes.
- No synthetic bulking agents or additives
- Pullulan capsules (natural, plant-based)
- Gluten, dairy and wheat free
- Vegetarian friendly
- 100% recyclable packaging
- Made in the UK (GMP & HACCP certified)
- Third-party tested
Are there any side effects or interactions?
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Vitamin D is generally well tolerated at recommended doses.
However, because this formula contains vitamin K2, it may not be suitable if you are taking blood thinning medication.
If pregnant, breastfeeding, taking medication, or managing a condition, consult your doctor before use.
Customer Reviews
See what customers are saying about our Vitamin D3 Complete
T
Tinkerbell
- Go to product
Reviewed
in the
United Kingdom
on
26 November 2025
Excellent product. My go to brand because of the additional minerals for efficacy. Ethical company. Worth the price. Lovely brown glass bottle to prevent spoilage and recyclable. Good strength Vit D3 with added K2 for better absorption. Highly recommended in my humble opinion.
2
people found this helpful
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B
Belle
- Brilliant
Reviewed
in the
United Kingdom
on
1 November 2025
Love this!! Has helped me with my hair regrowth as I’m not one for being out in the sun.
1
people found this helpful
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T
Tansy
- A manageable sized medium-small capsule.
Reviewed
in the
United Kingdom
on
16 December 2025
I can't say whether these are working, but there is nothing negative to say. They are a medium-small sized capsule, not some jumbo size that ends up at the back of my throat and then the back of the cupboard. More convenient than trying to take all the components separately.
1
person found this helpful
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