Vitamins A-D-K

Name: Vitamins A-D-K
Brand: Bulletproof
SKU: product-0356
Price: 50.00 GBP
Availability: InStock
Rating: 4.8 (12 reviews)

£50.00

Bulletproof Vitamins A-D-K is a combined fat-soluble vitamin supplement delivering vitamins A, D3, K1, and K2 in a single daily softgel.

Supports bone mineralisation via D3, K1, and K2
Helps direct calcium away from soft tissues
Consolidates four fat-soluble vitamins in one softgel
Relevant for those with low sun exposure or confirmed low D3
May support immune defence and normal cell function

4.8 (12 reflections)

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BulletproofVitamins A-D-K

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about this product.

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.

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.

Customer reflections

Overall sentiment

4.812 reflections

1 – 6 of 12 reflections

QQVerified Buyer

The first adrenal support that made a quick difference.

4 days ago

Gentle on a sensitive stomach, and I feel like myself again. I had tried two other glandulars before this and neither sat right.

MRVerified Buyer

Steadier mornings within a fortnight.

1 week ago

I was sceptical about glandulars, but my mid-afternoon crash has genuinely eased. One capsule with breakfast and I forget about it.

ALVerified Buyer

Subtle, but real.

2 weeks ago

Not a stimulant, which is exactly what I wanted. It took about ten days, then I realised I wasn’t dreading the afternoon any more.

SKVerified Buyer

My clinician recommended it.

3 weeks ago

Bought after a blood panel flagged a flat cortisol curve. Easy to take, no jitters, and the sourcing is refreshingly transparent.

TPVerified Buyer

Recovery feels faster.

1 month ago

Training hard through a stressful stretch and this has helped me bounce back between sessions. Already on my second bottle.

DVVerified Buyer

Does what it says.

1 month ago

No frills, one ingredient, a sensible dose. I appreciate that it is designed to be used for a season rather than forever.

Vitamins A-D-K

about this product.

how to take it

frequently asked.

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