Vitamin K2 MK-7 means menaquinone-7, one form of vitamin K2. The “7” identifies part of its chemical structure, not a serving of 7mg, a strength rating or a separate nutrient called vitamin K7.
Understanding the name is useful because vitamin K products can look more different than they are, or more interchangeable than they should. Start by separating the vitamin family, the form and the amount supplied. Then consider food, medicines and whether a combination actually fits your needs.
Where MK-7 fits in the vitamin K family
Vitamin K is a family of related substances. K1 is called phylloquinone. K2 refers to menaquinones, which include forms such as MK-4 and MK-7.
Name
What it identifies
What not to infer
K1: phylloquinone
A vitamin K form prominent in green vegetables.
That its functions are restricted to clotting alone.
K2: menaquinones
A group of vitamin K forms.
That every K2 ingredient is the same preparation.
MK-4
Menaquinone-4, a K2 form with a particular side-chain structure.
That “4” is the amount supplied.
MK-7
Menaquinone-7, another K2 form.
That it is seven times stronger, or means 7mg.
The numbers relate to repeating units in the molecules’ side chains. That structural distinction can affect how forms behave, but it is not a ready-made clinical ranking. A claim about blood persistence, for example, would not by itself demonstrate fewer fractures or a better outcome for an individual.
What does vitamin K do?
Vitamin K helps certain proteins become functional through a biochemical activation step. Some of these proteins are involved in normal blood clotting; others have roles in bone tissue.
It is therefore misleading to divide the family into “K1 only for blood” and “K2 only for bones”. Those are not mutually exclusive functions. Equally, the involvement of a protein in bone biology does not establish that a particular supplement prevents osteoporosis.
Simple descriptions about “directing calcium” can also go too far. They should not be used to promise that MK-7 clears arteries, prevents disease or makes excessive vitamin D safe.
Which foods provide vitamin K?
Green leafy vegetables such as broccoli and spinach are useful K1 sources. Vegetable oils and cereal grains can also contribute vitamin K. These are ordinary foods within a balanced diet, not ingredients that need replacing because MK-7 sounds more specialised.
Some fermented foods contain menaquinones. Natto, a fermented soya food, is a well-known MK-7 example. Cheese can contain K2, but amounts vary with the product and production process; “fermented” does not guarantee a particular amount or form.
A practical food pattern might include greens with dinner, vegetables in a lunch dish and a varied choice of grains and protein foods. You do not need to treat every meal as a separate MK-7 delivery task.
Gut microorganisms can produce menaquinones, but that does not allow you to assume they cover all your needs. Nor does it establish that everyone needs a supplement. Food intake and individual circumstances still matter.
Is there a separate daily MK-7 requirement?
The NHS vitamin K guidance discusses vitamin K overall, not a mandatory MK-7 amount for every adult. It gives approximately 1 microgram daily per kilogram of body weight and says a varied, balanced diet should supply what you need.
For example, the NHS uses 65 micrograms for someone weighing 65kg. This is a general dietary guide, not an instruction to add that amount in a supplement, and not an individual treatment calculation.
A product’s percentage NRV refers to a labelling reference for vitamin K. It does not diagnose a separate “K2 deficiency”, tell you that everyone needs 200 micrograms of MK-7 or establish an upper safety threshold.
What does the bone research establish?
Research can measure different outcomes: changes in vitamin-K-dependent proteins, bone density or actual fractures. Those are not interchangeable. A favourable marker does not automatically mean that fewer fractures will occur.
A review of vitamin K supplementation and bone outcomes found insufficient evidence to confirm a fracture-reduction benefit. That does not mean vitamin K has no normal role in bone; it means the supplement outcome requires stronger support than biology alone.
Forms, amounts, populations and other treatments can differ between studies. Findings involving a particular preparation should not be transferred to every MK-7 product or treated as evidence for every finished combination.
Compare the amount separately from the form
Once you recognise MK-7 as a form name, the rest of a label becomes easier to interpret. Look for the amount per full daily serving and distinguish micrograms from milligrams: 1mg equals 1,000 micrograms.
For a hypothetical example, a product stating 50 micrograms per capsule would provide 100 micrograms across two capsules. That is arithmetic only, not an iLoveVits specification or a recommended serving. It illustrates why “per capsule” and “per day” can describe different amounts.
In a combination, also consider the other nutrients. Choosing MK-7 does not settle how much vitamin D is appropriate. Our vitamin D and K2 explanation separates their roles, while D3 and K2: do you need both? focuses on the combination decision.
Suitability: warfarin needs a specific conversation
If you take warfarin or another vitamin K antagonist, speak to your anticoagulation team before starting, stopping or changing a vitamin K supplement. Changes can affect anticoagulation control. Do not stop warfarin yourself, and do not interpret this as a reason to ban leafy vegetables; discuss a consistent dietary pattern with your team.
For other medicines, medical conditions, pregnancy or breastfeeding, ask a pharmacist or clinician about the complete formulation. The presence of a familiar nutrient is not a universal assurance of suitability.
Considering a high-strength combined formula?
If the strength and combination have been established as appropriate for you, explore iLoveVits Vitamin D3 & K2 with Vitamin C. It contains 200 micrograms of K2 MK-7 alongside 4,000 IU, equivalent to 100 micrograms, of D3 and vitamin C.
Its D3 amount reaches the NHS adult daily upper amount, making it a different choice from the routine 10-microgram vitamin D option. Establish suitability and avoid duplicating vitamin D across products.
Frequently asked questions
What exactly is MK-7?
It is menaquinone-7, one member of the vitamin K2 group. It identifies a form, not a product strength.
Is it called vitamin K7?
No. The usual terminology is vitamin K2 in the MK-7 form. K7 is not the same name.
Does the seven mean 7mg?
No. It relates to molecular structure. The supplied amount is stated separately, usually in micrograms.
Does all MK-7 come from natto?
No source should be assumed from the form name. Natto is a food example, not proof of how every finished supplement was made.
Is K1 only for clotting and K2 only for bones?
No. Those are oversimplified, mutually exclusive labels for a vitamin family with related functions.
Does MK-7 make a high vitamin D intake safe?
No. Vitamin D guidance still applies. Adding K2 is not permission to exceed appropriate intake.
Sources and further reading
NHS: Vitamin K, for food sources and UK dietary guidance.
NHS: Vitamin D, for routine advice and upper amounts relevant to combined formulas.
About this guide: Published by iLoveVits, a food-supplement retailer. This is general educational information. References are linked for checking the underlying evidence; ingredient research does not establish results for an iLoveVits finished product. Individual medical advice takes priority.
What Is Vitamin K2 MK7?
Vitamin K2 MK-7 means menaquinone-7, one form of vitamin K2. The “7” identifies part of its chemical structure, not a serving of 7mg, a strength rating or a separate nutrient called vitamin K7.
Understanding the name is useful because vitamin K products can look more different than they are, or more interchangeable than they should. Start by separating the vitamin family, the form and the amount supplied. Then consider food, medicines and whether a combination actually fits your needs.
Where MK-7 fits in the vitamin K family
Vitamin K is a family of related substances. K1 is called phylloquinone. K2 refers to menaquinones, which include forms such as MK-4 and MK-7.
The numbers relate to repeating units in the molecules’ side chains. That structural distinction can affect how forms behave, but it is not a ready-made clinical ranking. A claim about blood persistence, for example, would not by itself demonstrate fewer fractures or a better outcome for an individual.
What does vitamin K do?
Vitamin K helps certain proteins become functional through a biochemical activation step. Some of these proteins are involved in normal blood clotting; others have roles in bone tissue.
It is therefore misleading to divide the family into “K1 only for blood” and “K2 only for bones”. Those are not mutually exclusive functions. Equally, the involvement of a protein in bone biology does not establish that a particular supplement prevents osteoporosis.
Simple descriptions about “directing calcium” can also go too far. They should not be used to promise that MK-7 clears arteries, prevents disease or makes excessive vitamin D safe.
Which foods provide vitamin K?
Green leafy vegetables such as broccoli and spinach are useful K1 sources. Vegetable oils and cereal grains can also contribute vitamin K. These are ordinary foods within a balanced diet, not ingredients that need replacing because MK-7 sounds more specialised.
Some fermented foods contain menaquinones. Natto, a fermented soya food, is a well-known MK-7 example. Cheese can contain K2, but amounts vary with the product and production process; “fermented” does not guarantee a particular amount or form.
A practical food pattern might include greens with dinner, vegetables in a lunch dish and a varied choice of grains and protein foods. You do not need to treat every meal as a separate MK-7 delivery task.
Gut microorganisms can produce menaquinones, but that does not allow you to assume they cover all your needs. Nor does it establish that everyone needs a supplement. Food intake and individual circumstances still matter.
Is there a separate daily MK-7 requirement?
The NHS vitamin K guidance discusses vitamin K overall, not a mandatory MK-7 amount for every adult. It gives approximately 1 microgram daily per kilogram of body weight and says a varied, balanced diet should supply what you need.
For example, the NHS uses 65 micrograms for someone weighing 65kg. This is a general dietary guide, not an instruction to add that amount in a supplement, and not an individual treatment calculation.
A product’s percentage NRV refers to a labelling reference for vitamin K. It does not diagnose a separate “K2 deficiency”, tell you that everyone needs 200 micrograms of MK-7 or establish an upper safety threshold.
What does the bone research establish?
Research can measure different outcomes: changes in vitamin-K-dependent proteins, bone density or actual fractures. Those are not interchangeable. A favourable marker does not automatically mean that fewer fractures will occur.
A review of vitamin K supplementation and bone outcomes found insufficient evidence to confirm a fracture-reduction benefit. That does not mean vitamin K has no normal role in bone; it means the supplement outcome requires stronger support than biology alone.
Forms, amounts, populations and other treatments can differ between studies. Findings involving a particular preparation should not be transferred to every MK-7 product or treated as evidence for every finished combination.
Compare the amount separately from the form
Once you recognise MK-7 as a form name, the rest of a label becomes easier to interpret. Look for the amount per full daily serving and distinguish micrograms from milligrams: 1mg equals 1,000 micrograms.
For a hypothetical example, a product stating 50 micrograms per capsule would provide 100 micrograms across two capsules. That is arithmetic only, not an iLoveVits specification or a recommended serving. It illustrates why “per capsule” and “per day” can describe different amounts.
In a combination, also consider the other nutrients. Choosing MK-7 does not settle how much vitamin D is appropriate. Our vitamin D and K2 explanation separates their roles, while D3 and K2: do you need both? focuses on the combination decision.
Suitability: warfarin needs a specific conversation
If you take warfarin or another vitamin K antagonist, speak to your anticoagulation team before starting, stopping or changing a vitamin K supplement. Changes can affect anticoagulation control. Do not stop warfarin yourself, and do not interpret this as a reason to ban leafy vegetables; discuss a consistent dietary pattern with your team.
For other medicines, medical conditions, pregnancy or breastfeeding, ask a pharmacist or clinician about the complete formulation. The presence of a familiar nutrient is not a universal assurance of suitability.
Considering a high-strength combined formula?
If the strength and combination have been established as appropriate for you, explore iLoveVits Vitamin D3 & K2 with Vitamin C. It contains 200 micrograms of K2 MK-7 alongside 4,000 IU, equivalent to 100 micrograms, of D3 and vitamin C.
Its D3 amount reaches the NHS adult daily upper amount, making it a different choice from the routine 10-microgram vitamin D option. Establish suitability and avoid duplicating vitamin D across products.
Frequently asked questions
What exactly is MK-7?
It is menaquinone-7, one member of the vitamin K2 group. It identifies a form, not a product strength.
Is it called vitamin K7?
No. The usual terminology is vitamin K2 in the MK-7 form. K7 is not the same name.
Does the seven mean 7mg?
No. It relates to molecular structure. The supplied amount is stated separately, usually in micrograms.
Does all MK-7 come from natto?
No source should be assumed from the form name. Natto is a food example, not proof of how every finished supplement was made.
Is K1 only for clotting and K2 only for bones?
No. Those are oversimplified, mutually exclusive labels for a vitamin family with related functions.
Does MK-7 make a high vitamin D intake safe?
No. Vitamin D guidance still applies. Adding K2 is not permission to exceed appropriate intake.
Sources and further reading
About this guide: Published by iLoveVits, a food-supplement retailer. This is general educational information. References are linked for checking the underlying evidence; ingredient research does not establish results for an iLoveVits finished product. Individual medical advice takes priority.