Vitamin D3 and K2: why it is important to take them together

By Isabella Torta

vitamina d3 vitamina k2

Vitamin D: benefits, deficiencies, foods, dosages, and intake

What is vitamin D for?

Vitamin D is essential for calcium absorption and proper immune system function. It helps to:

  • Strengthen bones

  • Prevent osteoporosis

  • Regulate mood

  • Improve immune defenses

  • Support muscle health

What are the symptoms of vitamin D deficiency?

Vitamin D deficiency is an increasingly common condition and can manifest as:

  • chronic fatigue

  • muscle aches

  • bone fragility

  • increased susceptibility to infections

  • low mood and depression

  • sleep disturbances

What happens if you have vitamin D deficiency?

Chronic deficiency can lead to osteoporosis, rickets, reduced immune response, and hormonal imbalances. Vitamin D is essential for calcium absorption and bone health.

What to eat when you have vitamin D deficiency?

Among the best foods rich in vitamin D are:

  • cod liver oil

  • salmon, mackerel, tuna

  • whole eggs

  • sun-exposed mushrooms

  • fortified milk and dairy products

Curiosity: Few foods naturally contain vitamin D, which is why supplementation is often necessary.

Which fruits and vegetables contain vitamin D?

Vitamin D is not naturally present in fruits or vegetables in significant quantities. However, mushrooms (especially shiitake and maitake) can contain small doses if exposed to UV light.

What is the best vitamin D and how much to take?

The best form is vitamin D3 (cholecalciferol), because it is more bioavailable and similar to that naturally produced by the body through sun exposure.
Recommended dose: 1000-5000 IU/day, unless otherwise prescribed by a doctor.

How long does it take for vitamin D levels to rise?

It depends on the initial deficiency, the dose supplemented, and the method of administration (oral or transdermal).
Generally, levels normalize in 8-12 weeks with good supplementation.

Side effects of excess vitamin D

Beware of hypervitaminosis D, which can cause:

  • nausea, vomiting

  • hypercalcemia (too much calcium in the blood)

  • kidney damage

  • vascular calcifications

Difference between vitamin D and D3

  • Vitamin D is a generic term

  • Vitamin D3 (cholecalciferol) is the active and most effective form

  • D2 is less stable and less used

What are normal vitamin D levels?

  • Insufficiency: < 20 ng/mL

  • Normal: 30-60 ng/mL

  • High: > 100 ng/mL
    Levels above 150 ng/mL can be toxic.

Vitamin K2: benefits, differences, and synergy with D3

What is vitamin K for?

Vitamin K2 helps to:

  • fix calcium in bones and teeth

  • prevent calcium from depositing in soft tissues (kidneys, arteries)

  • prevent osteoporosis and vascular calcifications

What are the benefits of vitamin K2?

  • Activates osteocalcin (a key protein for bone mineralization)

  • Activates matrix GLA protein (which prevents calcium accumulation in soft tissues)

  • Helps prevent atherosclerosis

Vitamin D and K together or separately?

They should absolutely be taken together.
D3 increases calcium absorption, but without K2, calcium can deposit in the wrong places, increasing the risk of calcifications.

How much vitamin K2 per vitamin D?

The recommended ratio is:
100-200 mcg of K2 (MK-7 form) for every 1000-2000 IU of vitamin D3.

Difference between vitamin K and K2

  • K1 (phylloquinone): present in green leafy vegetables, acts on coagulation

  • K2 (menaquinone): acts on bones and blood vessels, more bioavailable and stable

Which foods do not contain vitamin K?

Foods lacking vitamin K:

  • Fruits (except kiwi, blueberries)

  • Skim milk

  • Pasta, rice

  • Lean meats

  • Refined oils

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Conclusion

Vitamin D3 and K2 should never be taken in isolation. Only by working together do they allow calcium to be used effectively and safely, improving bone, cardiovascular, and immune health.
Avoid unbalanced supplementation, prefer products with both nutrients, and always follow the advice of your trusted professional.

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