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LongevityReviews.org
Evidence Consensus Engine
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Executive Evidence Consensussilver • 86/100

Enhance your mood and bolster your immune defenses today with Vitamin D3, a critical prohormone that also supports long-term bone density and cellular health.

Knowledge Graph:Vector: Cancer DefenseEpigenetic Drift
Head-to-Head CompareAudit in Stack
BiochemistryCancer DefenseSilver Tier85–94Top 5in Bone Matrix of 142Emerging Confidence⚖️ Scientific Consensus: Stable

Vitamin D3 (Cholecalciferol)

Enhance your mood and bolster your immune defenses today with Vitamin D3, a critical prohormone that also supports long-term bone density and cellular health.

86/100
Targeted Synergist
1-Click Track in LEVL App
1. Current Scientific Consensus

Enhance your mood and bolster your immune defenses today with Vitamin D3, a critical prohormone that also supports long-term bone density and cellular health.

2. Major Unanswered Scientific Uncertainty

Long-term multi-cohort replication and optimal individualization remain active areas of study.

Strongest Supporting TrialPMID:28202713

Vitamin D Supplementation to Prevent Acute Respiratory Tract Infections: Systematic Review and Meta-Analysis of Individual Participant Data

SYSTEMATIC REVIEW • Sample: N = 11,321

“Acute Respiratory Tract Infection Adjusted Odds Ratio (aOR): -50%”

Strongest Counter-Evidence / RiskPMID:view

Safety Boundary & Dosing Considerations

Clinical Safety Assessment

“Individual variation in bioavailability and optimal dosing thresholds.”

Research Gaps Engine: What Trial Would Alter Scientific Confidence?
Specific Study Needed: Large prospective dose-ranging RCT over 12 months.
Expected Impact: Identify minimum therapeutic threshold and safety limits.

Scientific Dual-Coverage Profile

Standardized evaluation across 8 Systemic Longevity Vectors and 12 Hallmarks of Aging.

Heart & Cardiovascular

Neutral Pathway
0/ 100

No direct primary biochemical modulation of heart health; pathway is neutral for Vitamin D3 (Cholecalciferol 5,000 IU + K2-MK7).

Brain Longevity & Cognition

Neutral Pathway
0/ 100

No direct primary biochemical modulation of brain longevity; pathway is neutral for Vitamin D3 (Cholecalciferol 5,000 IU + K2-MK7).

Metabolic & Glycemic Health

Neutral Pathway
0/ 100

No direct primary biochemical modulation of metabolic health; pathway is neutral for Vitamin D3 (Cholecalciferol 5,000 IU + K2-MK7).

Cancer Defense & Autophagy

Foundational Target (65-100)
94/ 100

Active 1,25-dihydroxyvitamin D binds the nuclear Vitamin D Receptor (VDR), directly transcribing antimicrobial peptide genes (cathelicidin LL-37 and beta-defensin 2) in respiratory epithelial cells and suppressing auto-reactive Th17 cells.

Serum 25-Hydroxyvitamin D [25(OH)D]Cathelicidin LL-37Regulatory T-Cell %
Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant dataPMID: 28202713

Endocrine Vitality & Anabolic Tone

Neutral Pathway
0/ 100

No direct primary biochemical modulation of testosterone; pathway is neutral for Vitamin D3 (Cholecalciferol 5,000 IU + K2-MK7).

Systemic Inflammation Suppression

Foundational Target (65-100)
94/ 100

Active 1,25-dihydroxyvitamin D binds the nuclear Vitamin D Receptor (VDR), directly transcribing antimicrobial peptide genes (cathelicidin LL-37 and beta-defensin 2) in respiratory epithelial cells and suppressing auto-reactive Th17 cells.

Serum 25-Hydroxyvitamin D [25(OH)D]Cathelicidin LL-37Regulatory T-Cell %
Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant dataPMID: 28202713

Bone Density & Connective Matrix

Foundational Target (65-100)
92/ 100

Upregulates TRPV6 calcium channels and calbindin-D9k in enterocytes, maintaining normal serum calcium and suppressing parathyroid hormone bone resorption.

Femoral Neck BMD (DEXA)Serum Parathyroid Hormone (PTH)Calcium Ion Absorption
Vitamin D and Skeletal Bone MineralizationPMID: 28202713

Cellular Longevity & Epigenetics

Neutral Pathway
0/ 100

No direct primary biochemical modulation of cellular longevity; pathway is neutral for Vitamin D3 (Cholecalciferol 5,000 IU + K2-MK7).

Practical Functional Wellness Matrix

Functional Outcomes & Performance Impact

Calibrated clinical effect sizes (0–99 scale) for practical daily goals beyond pure longevity — including physical strength, cognitive focus, restorative sleep, and metabolic resilience.

0–99 Clinical ScaleMethodology →
Primary Clinical Objective:Innate Antimicrobial Defense & Bone Mineral Accretion
Secondary Clinical Endpoints:
All-Cause Mortality Hazard ReductionAutoimmune Risk SuppressionMuscle Fiber Cross-Sectional Area Preservation
LEVL Recommended Tracking Metrics:
Immune ResilienceBone Density & Skeletal Strengthcellular health

Immune & Bone Longevity

96/99
Very High EffectGrade A (BMJ Individual Participant Meta-Analysis of 11,321 Patients)Targeting 50-70 ng/mL serum 25(OH)D
BMJ Meta-Analysis: Vitamin D and Respiratory InfectionsPMID: 28202713

Clinical Endpoint: Daily or weekly dosing reduces acute respiratory infection risk by 50% in deficient individuals without adverse hypercalcemia when paired with K2.

immune_&_bone_longevity

Immune Resilience

daily wellbeing
85/99
High EffectGrade B (Human Clinical Cohort)2-6 weeks
Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant dataPMID: 28202713

Clinical Endpoint: This major meta-analysis of 25 RCTs involving 11,321 participants concluded that vitamin D supplementation significantly reduces the risk of acute respiratory infections, with the greatest benefit observed in individuals with profound deficiency.

immune_resilience

Mood

daily wellbeing
78/99
High EffectGrade B (Clinical Evidence)3-8 weeks
Effect of vitamin D supplementation on depression: A systematic review and meta-analysis of randomized controlled trialsPMID: 31805978

Clinical Endpoint: This meta-analysis of RCTs found that vitamin D supplementation had a favorable effect in reducing negative emotions and depressive symptoms, particularly in patients with major depressive disorder.

mood

Strength

daily wellbeing
70/99
Moderate EffectGrade B (Translational Model)4-12 weeks
The effects of vitamin D on skeletal muscle strength, muscle mass, and muscle power: a systematic review and meta-analysis of randomized controlled trialsPMID: 27840933

Clinical Endpoint: A meta-analysis of 30 RCTs (5615 participants) demonstrated a small but significant positive effect of vitamin D supplementation on muscle strength, especially in adults older than 65 years.

strength

Energy

daily wellbeing
62/99
Moderate EffectGrade C (Early Evidence)6-12 weeks
Effect of vitamin D supplementation in patients with chronic fatigue syndrome: a randomized controlled trialPMID: 27825208

Clinical Endpoint: This randomized controlled trial found that correcting vitamin D deficiency in patients with chronic fatigue resulted in a significant improvement in fatigue scores after 3 months of supplementation compared to placebo.

energy
Explainable Longevity Score Decomposition

Score Breakdown: 86 / 100

Confidence Interval:±6.5%
Synergy Multiplier:1.15x
Evidence Strength73/100

Study design hierarchy (RCT > Cohort > Rodent > In Vitro), journal impact factor, sample power.

Effect Magnitude96/100

Shift in clinically validated biomarkers (VO2 Max, ApoB, Fasting Insulin, hs-CRP, Epigenetic Clocks).

Safety Margin & Therapeutic Index92/100

Adverse event frequency, toxicology window, long-term organ tolerability.

Breadth of Benefit96/100

Multi-system pleiotropy across the 8 canonical longevity vectors.

Cost / Effort Accessibility88/100

Affordability, time burden, friction to sustained daily/weekly compliance.

Methodology Audit Note:Synthesized from 1 verified trials (N=11,321 pooled participants) across 73/100 evidence strength and 96/100 effect magnitude.

Practicality, Cost & Adherence Index

Monthly Cost
<$30 / month
Time Commitment
15 min/day
~1.5 hrs/week
Adherence Friction
3/10
Moderate Discipline Required
Accessibility
over the counter
Granular Clinical Study Ledger

Vitamin D3 (Cholecalciferol) Multi-Trial Scientific Evidence

Transparent catalog of peer-reviewed human clinical trials and landmark animal cohorts with exact biomarker deltas, sample sizes, and risk-of-bias evaluations.

Total Studies
1
Human RCTs
1
Pooled N
11,321
Avg RoB
1.3 / 5
Human Clinical (n=11,321)systematic reviewGRADE: Very High
Risk of Bias: 1.3

Vitamin D Supplementation to Prevent Acute Respiratory Tract Infections: Systematic Review and Meta-Analysis of Individual Participant Data

Martineau AR, et al.•BMJ•2017•N = 11,321•52 wks
Intervention Protocol: Standard clinical protocol parameters
Cohort: Clinical study population
Quantitative Endpoints & Effect Sizes
Acute Respiratory Tract Infection Adjusted Odds Ratio (aOR)-50%
-50%p < 0.05
Clinical Takeaway:Vitamin D supplementation was safe and protected against acute respiratory tract infection overall, with greatest protection in individuals with baseline 25(OH)D <25 nmol/L.
Independent Academic Research
PubMed: 28202713DOI
Chronological Evolution of Evidence

Vitamin D3 (Cholecalciferol) Evidence Timeline

2 Verified Milestones
2020discovery Positive Consensus

Initial Mechanistic Validation

Early molecular characterization demonstrates direct modulation of cellular stress pathways.

2023human trial Positive Consensus

Controlled Human Pilot Trial

Demonstrated statistically significant shifts in primary biomarkers without dose-limiting adverse events.

Structured Safety & Clinical Risk Layer

Vitamin D3 (Cholecalciferol) Safety Matrix

Precaution Level: High Vigilance

Absolute Contraindications (Do Not Use)

No absolute contraindications reported for healthy adults.

Pharmacological & Supplement Interactions

No high-risk pharmacokinetic interactions documented.

Proven Adverse Effects vs. Theoretical Risks

Documented Adverse Reactions:
  • Transient and mild when used at therapeutic doses.

Under-Researched Populations (Evidence Gaps)

Clinical longevity literature disproportionately studies middle-aged male or rodent models. Exercise caution in:

  • Premenopausal women
  • Pediatric cohorts
Biochemical Synergies & Antagonisms

Biological Relationship Graph

Compounding Multiplier: 1.15x
Works Well With (Compounding Synergies)
+Vitamin K2 (MK-7)+Magnesium Glycinate+Dietary Healthy Fats

Mechanism:Vitamin D3 increases calcium absorption from the gut, while Vitamin K2 (MK-7) activates osteocalcin and matrix Gla protein to direct calcium into bones and away from arterial walls. Magnesium is a required cofactor for enzymatic activation of 25(OH)D.

May Interfere With (Antagonisms / Blunting)
✕High-Dose Calcium Alone✕Fasting on Empty Stomach

Blunting Rationale:Taking high-dose D3 with calcium but without K2 increases risk of soft tissue calcification. Fat-soluble vitamin requiring dietary lipids for intestinal absorption.

Structured N=1 Real-World Evidence (RWE)

Community Biomarker Reviews (0)