Why D3 and K2 are supplied as preparations

Cholecalciferol and MK-7 are active at microgram levels — quantities far too small to handle, blend evenly or compress on their own. Both are therefore supplied as standardised preparations: the pure vitamin dispersed onto a food-grade carrier so it can be dosed accurately and remains stable.

That means the preparation weight in the ingredients list is considerably higher than the active content. This is entirely normal and it's how essentially every D3 and K2 supplement on the market is made. What isn't normal is spelling it out — so here are both figures.

"Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus"

"Vitamin D contributes to normal blood calcium levels"

"Vitamin D contributes to the maintenance of normal bones"

"Vitamin D contributes to the maintenance of normal muscle function"

"Vitamin D contributes to the maintenance of normal teeth"

"Vitamin D contributes to the normal function of the immune system"

"Vitamin D has a role in the process of cell division"

"Vitamin K contributes to normal blood clotting"

"Vitamin K contributes to the maintenance of normal bones"

Why the carriers are there

Acacia gum, sucrose, sunflower oil and starch carry the cholecalciferol. Beta cyclodextrin carries the MK-7. Without them, microgram doses could not be blended evenly or kept stable.

Why the binders are there

Microcrystalline cellulose and dicalcium phosphate give the tablet structure; magnesium stearate and silicon dioxide allow even compression. No tablet can be made without them.

⚠️ Contains sucrose

Sucrose is present as part of the D3 preparation carrier. The quantity is very small but it is declared for anyone monitoring sugar intake.

⚠️ Not suitable for vegans

Cholecalciferol in this product is not lichen-derived. Vegans should look for vitamin D2 or a lichen-sourced D3 product instead. We would rather tell you than let you assume.

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How much actual D3 and K2 is in each tablet?

125mcg (5,000 IU) of cholecalciferol and 100mcg of menaquinone-7 (MK-7) — the actual active compounds. Both are supplied as standardised preparations, so the preparation weight in the ingredients list is higher than the active content. We declare both figures.

Why do the ingredients list preparations rather than the vitamins alone?

Cholecalciferol and MK-7 are active at microgram levels and are unstable in isolation, so both are supplied on a food-grade carrier. Our D3 preparation uses acacia gum, sucrose, sunflower oil and starch; the K2 preparation uses beta cyclodextrin. Standard industry practice — declared here in full.

Is 5,000 IU of vitamin D safe?

This is a high-strength dose that exceeds the EFSA tolerable upper intake level of 100mcg (4,000 IU) per day for adults. NHS advice is that 10mcg (400 IU) daily is sufficient for most adults. Do not exceed one tablet daily, do not combine with other vitamin D supplements, and consult your GP before use — particularly before long-term use. Not suitable for children.

Can I take this on warfarin or another anticoagulant?

Not without consulting your GP first. Vitamin K directly affects blood clotting and interacts with warfarin and other coumarin anticoagulants. This is an important interaction and medical advice is essential before use.

Why combine vitamin D3 with K2?

Both vitamins independently carry an authorised claim for the maintenance of normal bones, and vitamin D additionally carries claims for normal absorption and utilisation of calcium and phosphorus and normal blood calcium levels. No claim is authorised for the two acting together, so none is made — the combination is offered as a convenience of format.

Is this suitable for vegans?

No. The cholecalciferol in this product is not lichen-derived. Vegans should look for vitamin D2 (ergocalciferol) or a lichen-sourced D3 product instead.

Does this tablet contain binders?

Yes — microcrystalline cellulose, dicalcium phosphate, magnesium stearate and silicon dioxide. Tablets cannot be compressed without them. Our capsule range is zero-filler; tablets are not, and we say so rather than claiming otherwise.

Do you offer a subscription or instalments?

Yes — subscribe and save 10% on every order, pause or cancel any time. Orders over £50 can be spread across 3 interest-free instalments with Klarna or Shop Pay. Subject to status and eligibility, 18+, UK residents.