Vitamin D3 5000 IU + K2 (MK-7) 100mcg
Vitamin D3 paired with K2 (MK-7) for people with limited sun exposure or low vitamin D status. Best evidence supports correcting deficiency rather than high-dose use in already-replete people.
Resar evidence panel
0–100 · cited research only
Evidence Score
77
Strong
Safety Score
59
Good
Effectiveness Score
77
Strong
Research Confidence
68
Good
Product Fit Score
74
Strong
Bottom line
Strong evidence (Strong) for immune health — worth a closer look if this fits your goals.
Individual results vary. Summaries are educational — not medical advice.
Evidence Score
77
Strong
Price
$21.95
Resar may earn an affiliate commission on this purchase. Commissions never change scores — see our affiliate disclosure and conflicts policy. Scores reflect cited research, not medical advice.
Compare others in Immune HealthTop research
The strongest studies behind this product
Ranked by evidence hierarchy and how closely each study matches this product. Start with the strongest study, then read down. Every claim needs a trail.
Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data
Meta Analysis · BMJ · 2017 · n=10,933
What the research shows
Meaningful protection concentrated in deficient individuals; little effect in those already replete.
Effects of vitamin D supplementation on musculoskeletal health: a systematic review, meta-analysis, and trial sequential analysis
Meta Analysis · The Lancet Diabetes & Endocrinology · 2018
Vitamin D supplementation: a review of the evidence on dosing and status
Other · Reviews in Endocrine and Metabolic Disorders · 2017
Scores reflect these cited studies, not medical advice. Expand the full evidence detail below for protocols, dose context, and reported side effects.
Claim ledger
Every claim, mapped to its source
Each product claim below is tied to a specific paper with study type, match strength, and limitations. Nothing here is medical advice — it is a research trail you can audit.
Claim match reflects how closely a specific paper supports this benefit — not AI confidence or medical certainty.
Full evidence detail
Study-by-study breakdown
Each paper below is ranked for this listing. Start with the highest match, then expand any study for a plain-language readout.
How to read this section
- Match % - how closely the study matches this product (not overall scientific quality).
- Evidence type - study design (RCT, review, etc.) and whether it is direct, category-level, or indirect.
- What it found - short summary and quoted extract from the paper metadata. Not medical advice.
In plain language
What the study reported
Verified extract — not AI generated
“Meaningful protection concentrated in deficient individuals; little effect in those already replete.”
Daily or weekly dosing outperformed large infrequent bolus doses.
No increase in serious adverse events or hypercalcemia at studied doses.
Caveats
Benefit in vitamin D-replete people is minimal; results driven by correcting deficiency.
Transparency
Score history
Human review is pending for this listing.
Reviews
Shopper feedback
4.7
average rating
26,140 Amazon reviews were available from the listing metadata.