Why Vitamin D3 + K2? Understanding the Combination

Why Vitamin D3 + K2?

Vitamin D is one of the best-known nutrients in everyday supplementation, particularly in the UK where sunlight exposure changes significantly throughout the year.

But vitamin D is not the only nutrient involved in maintaining normal bones. Vitamin K also has an important nutritional role, which is why vitamin D3 and vitamin K2 are often found together in thoughtfully formulated daily supplements.

In this guide, we explain what vitamin D3 and vitamin K2 are, what each nutrient contributes to and why they are commonly combined.

What Is Vitamin D3?

Vitamin D3, also known as cholecalciferol, is a form of vitamin D used in many food supplements.

Vitamin D contributes to the normal absorption and utilisation of calcium and phosphorus. It also contributes to the maintenance of normal bones, normal muscle function and the normal function of the immune system.

Our bodies can produce vitamin D when the skin is exposed to sunlight. In the UK, however, sunlight is not strong enough for most people to make sufficient vitamin D between October and early March. NHS guidance therefore recommends that everyone should consider taking a daily vitamin D supplement during autumn and winter.

What Is Vitamin K2?

Vitamin K is a fat-soluble vitamin found in several forms. Vitamin K1 is known as phylloquinone, while vitamin K2 refers to a group of compounds known as menaquinones.

Vitamin K contributes to normal blood clotting and to the maintenance of normal bones.

One commonly used form of vitamin K2 in supplements is MK-7, or menaquinone-7.

What Does MK-7 Mean?

MK-7 is simply a specific form of vitamin K2. Different menaquinones vary in their chemical structure and how long they remain available in the body.

MK-7 is widely used in food supplements because it is suitable for once-daily formulations and provides vitamin K in a convenient form.

Why Are Vitamin D3 and K2 Often Combined?

Vitamin D and vitamin K have different authorised nutritional roles, but both contribute to the maintenance of normal bones.

Vitamin D also contributes to normal calcium absorption and utilisation, while vitamin K contributes to normal blood clotting.

Bringing the two nutrients together therefore creates a simple daily formula containing two nutrients with complementary roles in normal bone maintenance.

This does not mean that one nutrient only works when the other is present. Rather, each performs its own recognised function within normal human nutrition.

Vitamin D and Life in the UK

Vitamin D is particularly relevant in the UK because our ability to produce it from sunlight changes with the seasons.

According to NHS guidance, most people can make the vitamin D they need from sunlight between late March or early April and the end of September. Between October and early March, however, the sun is not strong enough for the body to make sufficient vitamin D.

People who spend very little time outdoors, regularly cover most of their skin or have darker skin may also be at greater risk of not getting enough vitamin D from sunlight.

You can read more about this in our guide Do You Really Need Vitamin D3 in the UK?.

How Much Vitamin D Do Adults Need?

NHS guidance states that adults need 10 micrograms of vitamin D per day and that everyone should consider taking a daily supplement containing 10 micrograms during autumn and winter.

It also advises adults not to take more than 100 micrograms, equivalent to 4,000 IU, of vitamin D per day unless advised otherwise by a healthcare professional.

Individual requirements can vary, so anyone who has been advised to take a particular dose by a doctor should follow that advice.

How Does Revora Vitamin D3 + K2 Fit Into a Daily Routine?

Revora Vitamin D3 + K2 combines vitamin D3 with vitamin K2 in the MK-7 form in one convenient daily tablet.

The idea is deliberately simple: a clearly labelled formula designed to make everyday consistency easier.

Rather than adding unnecessary complexity, the formula focuses on two nutrients with established nutritional roles.

Frequently Asked Questions

What is the difference between vitamin D and vitamin D3?

Vitamin D is the general name for a group of fat-soluble compounds. Vitamin D3, or cholecalciferol, is one of the main forms used in supplements.

What does K2 MK-7 mean?

K2 refers to vitamin K2, while MK-7 refers to menaquinone-7, one particular form of vitamin K2.

Why do supplements combine D3 and K2?

Vitamin D and vitamin K both contribute to the maintenance of normal bones. Vitamin D additionally contributes to normal calcium absorption and utilisation, while vitamin K contributes to normal blood clotting.

Can vitamin D3 and K2 be taken every day?

They are commonly used in daily food supplements. Always follow the instructions on the product label and seek professional advice if you take medicines or have a medical condition.

Who should be careful with vitamin K supplements?

People taking anticoagulant medicines such as warfarin should speak to their doctor or pharmacist before taking supplements containing vitamin K, as vitamin K intake can be relevant to anticoagulant treatment.

A Simpler Way to Think About D3 + K2

Vitamin D3 and vitamin K2 do not need complicated explanations.

Vitamin D contributes to normal calcium absorption, normal bones, normal muscle function and normal immune function. Vitamin K contributes to normal blood clotting and the maintenance of normal bones.

Together, they provide two complementary nutrients in one straightforward daily formula.

If you would like to explore the formula itself, you can view Revora Vitamin D3 + K2.

Food supplements should not be used as a substitute for a varied, balanced diet and healthy lifestyle.