💊 What it does
A combined D3 and K2 supplement addresses the two most important fat-soluble vitamins that work synergistically for bone and cardiovascular health. Vitamin D3 increases calcium absorption from the gut — K2 (as MK-7) then activates osteocalcin and matrix Gla protein to direct that calcium into bones and away from artery walls. Taking them together is more convenient and ensures the pair are present simultaneously.
👤 Who needs it
Anyone supplementing vitamin D3 at 25 µg (1,000 IU) or above who wants to ensure calcium is directed to bones rather than arteries. Post-menopausal women concerned about both bone density and cardiovascular health. People with a family history of arterial calcification.
🥦 Food sources first
Vitamin D3: very limited food sources (UV-exposed mushrooms, fortified plant milks). Vitamin K2 MK-7: natto (fermented soya) is by far the richest source, but rarely eaten in the UK. Both nutrients are difficult to obtain adequately from diet alone for people with limited sun exposure and no natto intake.
🗓 When to supplement
When supplementing vitamin D3 at 25 µg or above. As a convenient single-capsule alternative to buying both separately.
🏷 Best form to look for
Lichen-derived D3 paired with natto-derived MK-7 in a fat-soluble delivery base (olive oil or sunflower oil softgel). This combination ensures both are plant-based and in the optimal forms.
⏰ When to take it
With a meal containing fat — both are fat-soluble. Evening with dinner works well.