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We recommend this for patients who want to consolidate fat-soluble vitamin support without managing multiple separate capsules. The use of D3 rather than D2, paired with both K1 and K2, reflects the formulation choices our doctors make when recommending vitamin D support. In a country with limited sunlight for much of the year, this combination addresses a genuinely common gap — particularly for those with confirmed low vitamin D on a blood panel.
About this product
Vitamins A-D-K
Bulletproof Vitamins A-D-K is a combined fat-soluble vitamin supplement delivering vitamins A, D3, K1, and K2 in a single daily softgel. These four nutrients are grouped together for good reason: they work through overlapping pathways, particularly around calcium regulation, bone mineralisation, and immune function.
Vitamin D3 is the form the body produces from sunlight and the one most readily used by cells. In the UK, where low sun exposure is the norm for much of the year, D3 deficiency is common and often undiagnosed. Vitamins K1 and K2 are both involved in directing calcium to where it belongs — bones and teeth — and away from soft tissue. Vitamin A supports immune defence, vision, and cell differentiation. Delivering all four together in a softgel format is practical: fat-soluble vitamins absorb better alongside dietary fat, and a single capsule reduces the burden of managing them separately.
This combination suits people who have identified low vitamin D through blood testing, those with limited sun exposure, or anyone seeking to consolidate fat-soluble micronutrient support into a clean, minimal daily routine. It is relevant in performance contexts too, where bone density, immune resilience, and recovery all matter.
Bulletproof have built a reputation around ingredient transparency and quality formulation. The use of D3 (cholecalciferol) rather than D2, and the inclusion of both K1 and K2, reflects an evidence-aware approach to fat-soluble vitamin supplementation.
What it does
Benefits
- 01
Supports bone mineralisation via D3, K1, and K2
- 02
Helps direct calcium away from soft tissues
- 03
Consolidates four fat-soluble vitamins in one softgel
- 04
Relevant for those with low sun exposure or confirmed low D3
- 05
May support immune defence and normal cell function
Get the most from it
How to use
Take one softgel daily, ideally with a meal containing fat — fat-soluble vitamins absorb more effectively alongside dietary lipids. Follow the dosage on the packaging and consult a clinician if you are already supplementing vitamin D separately.
What's inside
Ingredients
View full ingredient list
Vitamins A, D3, K1, K2
Common questions
Frequently asked
Why does this include both K1 and K2?
K1 and K2 are distinct forms of vitamin K with somewhat different roles. K2 in particular is studied for its involvement in activating proteins that regulate calcium deposition, steering it towards bones rather than arteries. Including both offers broader coverage across vitamin K's functions.
Do I need to take this with food?
Yes — fat-soluble vitamins (A, D, K) absorb significantly better when taken with a meal containing some fat. A softgel format already aids absorption, but pairing it with food makes a meaningful difference.
I already take a separate vitamin D supplement. Can I still take this?
Potentially, but you should check with a clinician first. Vitamin D toxicity from excessive intake is rare but real, and combining multiple D3 supplements without knowing your baseline levels is not advisable. A blood test is the sensible starting point.
Who is this particularly well-suited for?
People with limited sun exposure, those living in northern latitudes (including most of the UK), individuals with confirmed low vitamin D on a blood test, and anyone looking to simplify a multi-supplement routine into a single daily capsule.
How long before I notice a difference?
Fat-soluble vitamins accumulate gradually, so changes in measurable markers like serum vitamin D typically take several weeks to register. If you are supplementing to address a deficiency, a follow-up blood test after 8–12 weeks is a reasonable way to assess progress.
Doctor-guided care
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Body composition, hormones, VO₂ max — we measure them all. Train against the picture, not against guesswork.
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