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We recommend this combination because taking D3 without K2 is an increasingly questioned practice — D3 raises calcium absorption, and K2 is the mechanism by which that calcium is properly allocated to bone. The two belong together physiologically. Terranova's minimal-additive approach also fits our preference for formulations without unnecessary fillers. For anyone supplementing D3 long-term, the addition of K2 at a meaningful dose is, in our view, the more considered choice.
About this product
Vitamin D3 2000iu Vitamin K2 100ug Complex
Terranova Vitamin D3 2000 IU with Vitamin K2 100 mcg is a combined fat-soluble vitamin supplement designed to support bone mineralisation, calcium regulation, and immune function. Vitamin D3 — the form the body produces in response to sunlight — is the preferred supplemental form over D2, as it raises and maintains circulating 25(OH)D levels more effectively. Vitamin K2, specifically used to direct calcium toward bone tissue and away from soft tissue such as arterial walls, works alongside D3 in a complementary physiological pathway: D3 increases calcium absorption; K2 helps ensure it is deposited in the right places.
This pairing is particularly relevant for people living in northern latitudes like the UK, where sunlight is insufficient for adequate D3 synthesis for much of the year. It also suits those with confirmed low vitamin D on a blood panel, older adults concerned about bone density, and anyone who takes D3 alone and wants the added K2 for balanced calcium metabolism.
Terranova is a brand known for its clean, additive-minimal formulations. As with any fat-soluble vitamin supplement, taking it alongside a meal containing fat supports optimal absorption. The 2000 IU dose sits within the range broadly considered appropriate for daily maintenance in adults, though individuals with significant deficiency may be advised by a clinician to use a higher therapeutic dose first.
What it does
Benefits
- 01
Supports bone mineralisation via D3 and K2 together
- 02
Helps direct calcium away from arterial soft tissue
- 03
Maintains immune function through adequate vitamin D status
- 04
Well-suited to UK adults with limited sun exposure
- 05
Combines two fat-soluble vitamins in a single daily capsule
Get the most from it
How to use
Take one capsule daily with a meal that contains some fat, as both D3 and K2 are fat-soluble and absorption is improved in the presence of dietary fat. Follow the dosage guidance on the packaging and consult a clinician if you have a confirmed deficiency, as a higher therapeutic dose may be recommended before moving to maintenance.
What's inside
Ingredients
View full ingredient list
Vitamin D3 2000IU, Vitamin K2 100mcg
Common questions
Frequently asked
Why take K2 alongside D3?
Vitamin D3 increases the absorption of calcium from the gut. Vitamin K2 activates proteins — particularly osteocalcin and matrix Gla-protein — that direct calcium into bone and may help prevent it accumulating in soft tissues like blood vessels. The two vitamins work in the same calcium-regulation pathway, which is why combining them is considered more complete than D3 alone.
How do I know if I need vitamin D supplementation?
The most reliable way is a blood test measuring serum 25(OH)D. In the UK, routine deficiency is common, particularly from October to March. If you have not had your levels checked, a simple blood panel — available through your GP or a private clinic — will tell you whether you need a maintenance dose, a higher therapeutic dose, or nothing at all.
Is this safe to take if I am on blood-thinning medication such as warfarin?
Vitamin K2 can interact with anticoagulant medications, including warfarin, by influencing clotting factor activity. If you are on any anticoagulant, speak to your GP or prescribing clinician before starting this supplement — do not self-prescribe.
How long before I notice a difference?
Vitamin D is a slow-acting nutrient. Raising serum levels to an optimal range typically takes several weeks of consistent supplementation, and the benefits — improved bone density, immune resilience — are not acutely felt. A follow-up blood test after 10–12 weeks of supplementation is the practical way to confirm your levels have responded.
Can I take this alongside a general multivitamin?
Possibly, but check whether your multivitamin already contains D3 and K2, and at what amounts. Combining supplements containing fat-soluble vitamins can lead to unintended high intake over time. Check the packaging of both products and, if uncertain, ask a clinician or pharmacist to review your full supplement stack.
Doctor-guided care
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