A Note on Dose for Year-Round Use, Plus a Missing Interaction
Each tablet provides 4000 IU (100μg) of vitamin D3 alongside 100μg of vitamin K2 as MK7. As covered in more detail in our complete D3+K2 guide, the mechanism described here is accurate: D3 helps the body absorb calcium and supports normal immune function, while K2 is studied for directing that calcium toward bone rather than arteries — genuinely complementary roles.
It’s worth knowing that 4000 IU is on the higher end of commonly referenced D3 ranges, generally more appropriate for confirmed deficiency under GP guidance than routine, indefinite year-round use — this product is specifically packaged and marketed as a full year’s continuous supply at this strength. If you haven’t had your vitamin D levels tested, it’s worth discussing with your GP whether this dose or a more standard 1,000-2,000 IU is right for your ongoing, long-term use.
Worth adding, since it’s missing from this product’s description: if you take warfarin or other blood-thinning medication, vitamin K can reduce its effectiveness, and dosing may need to be stabilised and monitored by a doctor if you take both — this is a genuine interaction worth discussing with your GP before starting K2-containing supplements.
MK-7 is generally preferred over MK-4 for its longer half-life and better bioavailability. On the “scientifically proven” framing: D3 and K2’s individual roles are genuinely well-established, though it’s worth knowing the cardiovascular research specifically linking dietary K2 intake to outcomes (such as the well-known Rotterdam Study) reflects observational dietary data rather than a controlled trial of supplementation.
Vegetarian, gluten-free, dairy-free, manufactured with sustainable, letterbox-friendly packaging. Take one tablet daily with water. Not suitable for under-18s. Speak to your GP before starting if you take warfarin or other blood-thinning medication, are pregnant, breastfeeding, or have an existing health condition — and specifically about whether 4000 IU is the right ongoing dose for you rather than a more standard maintenance amount.
The Research Behind This Product
Supplement Spotlights
Vitamin D3 and K2 Together: What UK Research Actually Shows
What research genuinely supports about combining vitamin D3 and K2 for bone and heart health — including the honest limitations researchers themselves acknowledge.
Get the Full Guide
