Vitamin D3 + K2
Vitamin D3 (cholecalciferol) is made in the skin on exposure to sunlight.
Vitamin D3 + K2
1,000–2,000 IU (25–50 µg) of D3 + 90–180 µg of K2 a day. Do not exceed 4,000 IU a day of D3 (EFSA safe upper limit).
What it is
At latitudes like Spain’s, with indoor lives and months of little sun, deficiency is common. K2 as MK-7 comes from fermented foods such as Japanese natto. They are combined because K2 activates the proteins that bind calcium in bone. Its role in the arteries is being studied, but it has not been proven in people.
What it is used for
The quiz suggests it when your answers justify it. It usually appears with these goals:
What the evidence says
Consistent trials and reviews in people, or health claims authorised in the EU.
Authorised EU claim Vitamin D contributes to the maintenance of normal bones and to the normal function of the immune system. Correcting a deficiency is its best-established use; with normal levels, taking more has no proven benefit.
| Year | What was studied | What was found | Source |
|---|---|---|---|
| 2013 | Bone (K2): good evidence | MK-7 at 180 µg a day for 3 years reduced bone density loss in postmenopausal women. | Knapen et al.Osteoporosis International |
| 2022 | Falls and fractures: moderate, dose-dependent evidence | Meta-analysis: 800–1,000 IU a day was associated with a lower risk of fractures and falls; lower or higher doses were not. | Kong et al.Endocrinology and Metabolism |
What to look for on the label
- D3, not D2.
- K2 as all-trans MK-7.
- If you are vegan, D3 from lichen.
Precautions
- If you take anticoagulants (acenocoumarol, warfarin), choose vitamin D3 on its own, without K2: K2 interferes with their effect.
- If you have high calcium or kidney disease, or take thiazide diuretics or digoxin, ask first.
Where to find it
Products whose label meets what this profile asks for: form, dose per serving and nothing that contradicts it. Three at most: quality of the active comes first and, among the best, we look for one option in each price range. We choose by composition, not by who pays. The shops are European or ship to Europe.
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VegaveroShips from Germany€€Mid rangeVegavero
Vitamin D3 + K2 in oil
25 µg (1,000 IU) of D3 and 100 µg of K2 MK-7 per capsule
For the reference dose1 capsuleView at Vegavero (opens in a new tab)Meets the criteria.
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HSNShips from Spain€BudgetEssential Series
Vitamin D3 + K2 2,000 IU / 100 µg
50 µg (2,000 IU) of D3 and 100 µg of K2 MK-7 per capsule
For the reference dose1 capsuleView at HSN (opens in a new tab)Meets the criteria.
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Life ExtensionShips from the Netherlands€€€High endLife Extension
Nanoemulsified D3K2 (spray)
62.5 µg (2,500 IU) of D3 and 90 µg of K2 MK-7 per spray
For the reference dose1 sprayView at Life Extension (opens in a new tab)With caveats. 2,500 IU per spray: slightly above the reference range and within the EFSA limit.
We link to the shop; we do not sell anything. Today we earn no commission on any link. If we ever do, the link will say so and the selection will not change: the label decides. Labels checked on 2 November 2026; check the one on the pack before you buy. All these shops deliver to the EU; some of their pages open in Spanish. How we are funded.
Nearby in the library
Is it for you?
The quiz decides from your answers, not from a profile.
Profile reviewed on 3 November 2026. Sources: EFSA, Regulation (EU) 432/2012 and published studies. Image: Optical experiment: a large lens concentrates the sun’s rays. Engraving. Wellcome Collection, public domain.
General information based on published scientific evidence and EU law. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle, and are not intended to diagnose, treat or prevent any disease.
Do not exceed the daily dose stated on each product. If you take medication, have a medical condition or have any doubts, ask your doctor or pharmacist.