Vitamin D3 and vitamin K2 are often described as a “duo” for bones and the cardiovascular system. Why do nutrition experts in Germany so often recommend taking them together? This article explains the role of each vitamin, who may benefit and how to take them correctly.
Vitamin D3 – the “sunshine vitamin” matters more than you think
Vitamin D3 (cholecalciferol) is produced by the skin when exposed to UVB light; small amounts come from oily fish and egg yolk. Vitamin D contributes to:
- normal absorption and utilisation of calcium and phosphorus;
- the maintenance of normal bones and teeth;
- the maintenance of normal muscle function;
- the normal function of the immune system.
Even in sunny countries many people are low in vitamin D because they work indoors, cover up in the sun, use sunscreen, or – in older age – the skin produces less vitamin D.
Vitamin K2 – the calcium “coordinator”
Vitamin K2, especially as MK-7 (menaquinone-7), contributes to the maintenance of normal bones. K2 activates vitamin K-dependent proteins such as osteocalcin, which binds calcium into the bone matrix. MK-7 has a long half-life, which is why quality manufacturers such as FormMed prefer it under their Q360+ quality promise.
Why take D3 together with K2?
Vitamin D3 helps the body absorb more calcium, while vitamin K2 contributes to calcium getting where it belongs – into the bones. For long-term or higher-dose vitamin D3 supplementation, many experts therefore recommend adding K2. Magnesium is a sensible addition too, as it is involved in vitamin D metabolism.
Who should consider D3 + K2?
- People who get little sunlight and work indoors;
- People aged 50+, women around and after menopause;
- People with low 25(OH)D lab results;
- Vegetarians and people who rarely eat oily fish;
- Active people who want to keep their bones strong.
How to take D3 + K2 correctly
- Take it with or right after a meal containing fat: D3 and K2 are fat-soluble.
- Take it every day: results come from steady intake, not occasional high doses.
- Check regularly: a 25(OH)D test after 2–3 months helps adjust the dose.
- Caution with anticoagulants (e.g. warfarin/vitamin K antagonists): always consult your doctor before taking vitamin K.
FormMed products
See our Vitamin D3 + K2 + Magnesium range, for example:
- D-form 2,000 Magnesium+: vitamin D3 2,000 IU combined with 150 mg magnesium, suitable for long-term use;
- Basoform organic D3/K2: an organic alkaline mineral complex with vitamins D3 and K2.
Not sure which dose you need? Book a free 1:1 consultation with an MK expert or take a free health test first.
FAQ
Morning or evening?
Timing matters less than taking it with a fatty meal and doing so consistently. Many people choose breakfast or lunch to remember it.
Can you overdose on vitamin D?
Yes. Vitamin D accumulates in the body; very high doses over a long period can raise blood calcium. Follow the recommended dose on the product or your expert’s advice.
Note: This article is for information only and does not replace a diagnosis or advice from a doctor. Food supplements are not medicines and do not replace medical treatment.
