Vitamin K2
Backed by 74 studiesOverall grade based on research across 2 ingredients.
53out of 100Grade C
Research evidence score
Weighed against 74 published studies · led by Vitamin D3
Ingredient breakdown
C
Vitamin D3Supports bone health and immune function
Research direction: Leans supportiveEvidence: 34 studiesDose: 10 mcgEvidence strength: Moderate - supportive but mixed
Vitamin D and Health: Perspectives From Mice and Man (2008)Effect of supplemental vitamin D3 on bone mineral density: a systematic review and meta-analysis. (2022)Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data (2017)
C
Vitamin K2Supports vitamin function
Research direction: Mixed findingsEvidence: 40 studiesDose: 100 mcgEvidence strength: Moderate - supportive but mixed
The effect of vitamin K2 supplementation on bone turnover biochemical markers in postmenopausal osteoporosis patients: a systematic review and meta-analysis (2025)Randomized Controlled Clinical Trial of the Effect of Treatment with Vitamin K2 on Vascular Calcification in Hemodialysis Patients (Trevasc-HDK) (2023)The Role of Vitamin K2 in Cardiovascular Health (2024)
This summary describes only the ingredients and the research behind them — it is not a judgment of the product or its marketing. Grades reflect the weight of published evidence cross-referenced against 350M+ research papers. How we grade →
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