D3 + K2: The absolute foundation of dietary supplements. Why should almost everyone take them?

19.04.2026

Vitamin D3 and K2 are not just a fashion fad. They are two substances that the human body cannot provide itself in modern life - and their deficiency affects health more than most of us realize.

Experts today agree on one thing: the modern lifestyle creates ideal conditions for their deficiency. And that is why D3 + K2 is often referred to as the foundation on which it makes sense to build.

In this article you will learn:

Why do most people have a vitamin D3 deficiency and what are its effects?
How do I find out how much D3 I have in my body?
What are the effects of K2?
Does it make sense to take D3 and K2 together?
BCP capsules - D3 and B2 in 1 capsule
How to use D3 and K2 in practice?
Who makes the most sense for the combination?
Who is not suitable for use?
Do children also need D3 and K2?

What are the effects of vitamin D3 - and why are most people deficient in it?

Vitamin D3 (cholecalciferol) plays a vital role in the body. It is involved in the proper functioning of immunity, affects the health of bones and teeth, and helps the body effectively absorb calcium and phosphorus. It also affects muscle activity, the nervous system and psychological well-being and is involved in cell renewal processes. A sufficient level of vitamin D3 is therefore important not only for everyday functioning, but also as part of the prevention of a number of diseases.

The body can produce vitamin D3 itself - from sunlight. At first glance, it sounds simple, but in today's reality it often does not work. We spend most of the day indoors, working in offices, and in the winter months, the sun is too weak in our conditions to trigger the production of D3 at all.

The result is that a large part of the population has vitamin D levels that are lower than optimal for a long time - and this can gradually affect overall health.

How do I find out how much vitamin D3 I actually have in my body?

The most reliable way is a blood test, which measures the level of so-called 25(OH)D (calcidiol). This will show how much vitamin D your body actually has available. You can have the test done by a general practitioner or as a self-payer in regular laboratories. The optimal values are considered to be between 75–125 nmol/l – and a large part of the population falls below this limit.

What do studies say about D3?

Scientific studies published in 2025 shows that vitamin D3 plays an important role, especially where the body is deficient. For example, large meta-analyses of clinical studies suggest that vitamin D supplementation can reduce the risk of acute respiratory infections, with the greatest benefit seen in people with significantly low vitamin D levels.

What are the effects of vitamin K2?

Vitamin K2 plays a key role in the body, especially in calcium management. It helps activate specific proteins that ensure that calcium is deposited in the bones and teeth where it is needed, and not in soft tissues. This contributes to maintaining bone strength and at the same time supports vascular health. In addition, vitamin K2 is also involved in proper blood clotting and thus generally intervenes in several important processes in the body. In recent years, its role in preventing bone thinning and supporting cardiovascular health has also been investigated.

What do studies say about K2?

Vitamin K2 research is mainly based on studies focused on bone health and the cardiovascular system. For example, a systematic review and meta-analysis published in JAMA Internal Medicine showed that vitamin K supplementation (including K2 – menaquinone) is associated with reduced bone loss and lower incidence of fractures, particularly in older adults

Similarly, a more recent meta-analysis of randomized study (2022) found that vitamin K2 can increase bone density (BMD) and influence markers of bone metabolism, such as osteocalcin

From the point of view of the heart and blood vessels, the so-called Rotterdam Study is interesting, which showed that higher intake of vitamin K2 in the diet is associated with a lower risk of coronary heart disease

Why combine D3 with K2?

The combination of vitamins D3 and K2 is of fundamental importance for how the body handles calcium. While vitamin D3 increases its absorption into the blood, vitamin K2 ensures that calcium gets to where the body really needs it – namely into the bones and teeth. At the same time, it helps prevent its deposition in the blood vessels, thereby contributing to the protection of the cardiovascular system. It is precisely because of this complementary action that they are often referred to as having a synergistic effect.

In practice, this means that D3 helps the body obtain calcium, while K2 helps it use it properly.

Research suggests that taking D3 and K2 together may be more effective than taking them separately – especially in relation to bone and vascular health. On the other hand, long-term use of higher doses of vitamin D3 without sufficient K2 intake may not be ideal, as it can disrupt the balance in calcium storage in the body.

Simply put:

D3 increases the amount of calcium in the body
K2 ensures that it goes where it needs to

BCP capsules from Cannadorra: D3 + K2 in one capsule

That's why we included both of these substances together in BCP capsules from Cannadorra.

You don't have to decide what to combine with what, or keep track of two different boxes. In one capsule you get D3 and K2 in a mutually complementary ratio - as it makes sense from the point of view of physiology and scientific knowledge. In addition to D3 and K2, the capsules also contain BCP, natural antioxidants and DHA, which is very important for brain function.

BCP capsules are suitable for anyone who wants to have a solid foundation - especially in the winter months, with an office lifestyle or simply when you know you won't be out in the sun much.

What makes these D3+K2 capsules so unique?

In addition to the vitamins D3 and K2 themselves, what sets them apart is the content of two key substances – DHA and BCP, which take their effect to a completely different level.

DHA (docosahexaenoic acid) is one of the omega-3 fatty acids essential for the proper functioning of the brain and nervous system. It supports cognitive functions, memory and concentration, and also helps protect nerve cells. Regular intake of DHA is associated with long-term support of brain health and performance.

BCP (beta-caryophyllene) is a natural substance that acts on the endocannabinoid system and helps regulate inflammatory processes in the body. Thanks to this, it supports not only the nervous system, but also the overall balance of the organism.

It is the combination of DHA and BCP that creates a synergistic effect - while DHA nourishes the brain and supports its performance, BCP helps protect the nervous system and suppress inflammatory processes that can disrupt its function in the long term.

How best to take dietary supplements?

D3 and K2 are fat-soluble vitamins, so it is best to take them with food (it is recommended to take them in the morning or around lunch and ideally with food). Regularity is more important than precise timing – long-term administration is the key.

For whom does the combination of D3 + K2 make the most sense?

People with low sunlight exposure (typically office work in the winter months)
People of advanced age (when bone density naturally decreases)
Women after menopause
Active individuals and athletes (higher demands on the musculoskeletal system)
People with a one-sided diet or limited nutrient intake

However, in general, this combination can be beneficial for a wide part of the population today - simply because it combines the supplementation of the often missing vitamin D3 with the support of its proper use in the body thanks to vitamin K2.

For whom is the combination of D3 and K2 not suitable?

Here too, information is essential.

Vitamin K2 can affect blood clotting - therefore it is not suitable for people taking blood thinning medications (such as warfarin). Caution is also necessary in case of calcium metabolism disorders. In such a case, consult your doctor before starting supplementation.

Do children also need D3 + K2?

The answer to vitamin D3 is simple – yes. Its supplementation is commonly recommended for children, especially for the proper development of bones, teeth and the immune system. In our conditions, they do not produce enough of it from the sun most of the year.

With vitamin K2, it depends on the specific situation. Although children partially absorb it from their diet and create it in their intestines, supplementing it can make sense, especially with long-term use of D3 or during periods of intensive growth.

👉 In general, the combination of D3 + K2 can be beneficial for children, but it is always important to follow the dosage according to age and consult a pediatrician if you are unsure.

Conclusion: A dietary supplement that makes sense

Dietary supplements make sense when they supplement what modern life takes from us. D3 and K2 are exactly that case.

BCP capsules from Cannadorra are designed to be simple - no complicated combinations, no guesswork. Just a base that works.