If you have been researching Vitamin K2 supplements, you have likely encountered two forms: MK-4 and MK-7. Both are forms of vitamin K2, but they differ in their biological half-life, natural food sources, and the dosages used in research.
What Is Vitamin K2?
Vitamin K2 is distinct from Vitamin K1. While K1 (found in leafy greens) is primarily involved in blood clotting, K2 is involved in calcium metabolism. It activates proteins that help direct calcium to the bones and teeth rather than to soft tissues. This is why it is frequently paired with Vitamin D3, which increases calcium absorption — K2 helps determine where that calcium ends up.
MK-4
MK-4 is found in animal-based foods (meat, eggs, dairy) and is produced by the body from K1 via conversion. It has a short half-life — it clears the bloodstream relatively quickly — so dosing is typically multiple times per day in clinical research settings. Most dietary MK-4 comes from short-chain fermented foods and meat products.
MK-7
MK-7 has a much longer half-life than MK-4 — it remains active in the body for much longer, making once-daily dosing practical. It is found naturally in natto (fermented soy) and some fermented dairy products. MK-7 is the form most commonly found in supplement products, particularly combined D3+K2 formulas, because of its superior bioavailability and duration of action.
Which Is in Our D3 K2 Supplement?
The Vitamin D3 K2 carried by Supplements & More contains MK-7 — the longer-acting, more bioavailable form. Order via WhatsApp and we deliver across Lebanon with cash on delivery.