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Vitamin K is one of the more overlooked fat-soluble nutrients, yet its role in calcium metabolism makes it directly relevant to both bone and cardiovascular health. We chose Thorne's combined K1 and K2 formula because it covers both functional roles in a single capsule, and Thorne has an established track record of consistent formulation quality that our clinicians trust for patient-facing recommendations.
About this product
Vitamin K
Thorne Vitamin K is a combined K1 and K2 supplement designed to support bone mineralisation and cardiovascular health. The two forms of vitamin K work through distinct but complementary mechanisms. K1 (phylloquinone) is the form most associated with blood coagulation, activating clotting factors in the liver. K2 (menaquinone) has a longer half-life in the body and is the form most studied for directing calcium towards bone tissue and away from arterial walls — a distinction that matters clinically.
This product suits people with low dietary intake of vitamin K, which is common in those who avoid fermented foods and dark leafy greens. It is also relevant for individuals concerned about bone density, particularly post-menopausal women or those on long-term medications that may interfere with vitamin K metabolism. Combining K1 and K2 in one capsule simplifies a routine that might otherwise require two separate products.
Thorne is a brand with a long-standing clinical reputation. Their manufacturing standards are consistent with what we expect from brands recommended in a doctor-led setting, and their formulations are routinely used by practitioners who want reliable, clean-label options for their patients.
What it does
Benefits
- 01
Supports calcium direction to bone, not arterial walls
- 02
May support healthy bone density over time
- 03
Provides K1 for normal blood clotting function
- 04
Suits those with low fermented food or leafy green intake
- 05
Combines K1 and K2 in a single daily capsule
Get the most from it
How to use
Take 1 capsule daily, as directed on the packaging. Vitamin K is fat-soluble, so taking it with a meal that contains some dietary fat may improve absorption.
What's inside
Ingredients
View full ingredient list
Vitamin K1 and K2
Common questions
Frequently asked
What is the difference between vitamin K1 and K2?
K1 (phylloquinone) is primarily involved in activating clotting factors in the liver. K2 (menaquinone) has a longer circulating half-life and is the form most studied for calcium regulation — directing it towards bones and teeth and away from soft tissues such as arterial walls.
Is this safe to take if I am on warfarin or other blood thinners?
Vitamin K directly affects blood coagulation and can interfere with anticoagulant medications such as warfarin. If you are on any blood-thinning medication, do not take this supplement without first speaking to your doctor or pharmacist.
Who is most likely to benefit from a vitamin K supplement?
People with low intake of dark leafy greens and fermented foods (such as natto, aged cheeses) are most at risk of insufficiency. It is also worth considering if you take medications that impair fat absorption, or if you have been advised to support bone density.
How long does it take to notice a difference?
Vitamin K's effects on bone and cardiovascular health are long-term and cumulative — they are not felt acutely. Consistent daily use over months is the relevant time frame, and benefits are best assessed alongside appropriate health monitoring such as bone density scans.
Can I take this alongside a vitamin D supplement?
Vitamins D and K are often taken together, as vitamin D increases calcium absorption and vitamin K helps direct that calcium appropriately. This combination is commonly used in clinical practice, though it is always sensible to review your full supplement stack with a clinician.
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