Is Vitamin D3+K2 Combination safe to take daily?

Vitamin D3+K2 Combination is rated "Generally Safe" based on clinical evidence. Always consult your healthcare provider before starting any supplement.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

Vitamin D3+K2 Combination

MODERATE EVIDENCEVitaminLast updated

AVELOR SUMMARY

The D3+K2 combination is synergistic for calcium metabolism: vitamin D3 increases calcium ABSORPTION from the gut, while vitamin K2 (MK-7) DIRECTS that calcium to bones instead of arteries. Without K2, high-dose D3 supplementation may increase arterial calcification (the 'calcium paradox'). K2 activates osteocalcin (bone) and matrix-Gla protein (anti-calcification). A 2015 study found D3+K2 (1,000 IU + 45μg MK-7) improved bone density significantly more than D3 alone. This combination should be the default for anyone taking vitamin D. --- *Reviewed by the Dose AI Research Team and Clinical Advisory Board* *Last updated: 2026-04-06*

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Quality Testing Intelligence

Based on independent third-party laboratory analysis

Category pass rate: ~90% pass rate. One notable failure: Biotics Research at 195% of label (nearly double).

Common failures:

Over-dosing: Biotics Research contained 195% of labeled vitamin D (7,798 IU instead of 4,000 IU)

Under-dosing in multivitamins: Garden of Life Women's Multi only 54.8% vitamin D

Form confusion: D2 (ergocalciferol) vs D3 (cholecalciferol) — D3 is preferred

Form comparison:

Form: Efficacy: Source: Notes

D3 (Cholecalciferol): HIGHEST: Lanolin (animal) or Lichen (vegan): Preferred form. 87% more potent than D2 at raising blood levels.

D2 (Ergocalciferol): LOWER: Mushrooms/yeast: 87% less effective at raising blood levels than D3.

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Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:

Not medical advice. Based on published clinical research and systematic reviews.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

Vitamin D3+K2 Combination

MODERATE EVIDENCEVitaminLast updated

AVELOR SUMMARY

Scan a supplement containing Vitamin D3+K2 Combination

RELATED RESEARCH

Acerola Cherry

Amla

BiotinBiotin is a cofactor for five carboxylase enzymes critical to metabolism: pyruva

Amla

Quality Testing Intelligence

Based on independent third-party laboratory analysis

Category pass rate: ~90% pass rate. One notable failure: Biotics Research at 195% of label (nearly double).

Common failures:

Over-dosing: Biotics Research contained 195% of labeled vitamin D (7,798 IU instead of 4,000 IU)

Under-dosing in multivitamins: Garden of Life Women's Multi only 54.8% vitamin D

Form confusion: D2 (ergocalciferol) vs D3 (cholecalciferol) — D3 is preferred

Form comparison:

Form: Efficacy: Source: Notes

D3 (Cholecalciferol): HIGHEST: Lanolin (animal) or Lichen (vegan): Preferred form. 87% more potent than D2 at raising blood levels.

D2 (Ergocalciferol): LOWER: Mushrooms/yeast: 87% less effective at raising blood levels than D3.

Scan Your Vitamin D3+K2 Combination Supplement Browse all ingredients

Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:

Not medical advice. Based on published clinical research and systematic reviews.

Discover More

Explore

Browse All 834 Ingredients Browse All 20 Conditions