Scientific
Research Library
Every claim on The Iron Verdict is sourced from peer-reviewed research. This is that source — a searchable, filterable database of landmark studies in longevity, exercise science, nutrition, and supplementation.
Muscular Strength and All-Cause Mortality in Men
In 8,762 men followed 18.9 years, muscular strength was inversely associated with death from all causes and cancer independently of cardiorespiratory fitness. Low strength was the strongest predictor of early mortality.
Muscle-Strengthening Activities and Mortality Risk
Meta-analysis of 16 prospective cohorts (n=1,777,673). Muscle-strengthening activities independently associated with 15–17% lower all-cause mortality, cardiovascular disease, and cancer mortality.
Protein Supplementation and Muscle Mass: Meta-Analysis of 49 RCTs
Protein supplementation significantly augmented lean body mass (+0.30 kg) and strength. Effect was greatest in untrained individuals and older adults. Upper threshold ~1.62 g/kg/day for muscle mass gains.
VO₂ Max and All-Cause Mortality: 122,000 Patient Study
In 122,007 patients, the highest fitness group had 5× lower mortality risk vs. the lowest. The hazard ratio from elite to low fitness exceeded that of established risk factors including smoking, hypertension, and diabetes.
Cardiorespiratory Fitness as a Quantitative Predictor of All-Cause Mortality
CRF (measured as VO₂ max or METs) is among the strongest independent predictors of long-term mortality. Comparable in effect size to established risk factors. Evidence strongly supports CRF assessment in clinical practice.
Marine Omega-3 Supplementation and Cardiovascular Mortality
Meta-analysis of 13 RCTs (n=127,477). Marine omega-3 associated with 10% reduction in cardiovascular mortality and 8% reduction in fatal MI. EPA-dominant formulations showed stronger effects.
Sleep Duration and All-Cause Mortality: Meta-Analysis (n=1,382,999)
Both short sleep (<6h) and long sleep (>9h) are independently associated with significantly higher all-cause mortality in a dose-response fashion. U-shaped relationship confirmed across 16 prospective studies.
Magnesium Supplementation and Insomnia in Elderly Adults
Double-blind RCT (n=46 elderly adults). 500mg magnesium/day for 8 weeks significantly improved sleep quality, ISI score, sleep efficiency, and melatonin levels vs. placebo. Subjective sleep time increased by 35 min.
Magnesium and Slow-Wave Sleep
Oral magnesium supplementation in young adults significantly enhanced slow-wave (deep NREM) sleep, reduced cortisol levels, and increased plasma melatonin concentrations compared to placebo.
Creatine Supplementation and Health Outcomes in Aging: Narrative Review
Creatine monohydrate supplementation combined with resistance training significantly improves lean body mass, strength, functional performance, bone mineral density, and cognitive function in older adults (>55 years).
Beta-Alanine Supplementation and Exercise Capacity: Meta-Analysis
Meta-analysis of 40 double-blind RCTs confirms beta-alanine improves exercise capacity for efforts of 1–10 minutes. Carnosine buffering effect reduces intramuscular acidosis and extends time-to-fatigue by 2.85%.
Nicotinamide Riboside and NAD+ Metabolism in Humans
First-in-human RCT: NR 1,000mg/day significantly raised whole blood NAD+ by ~45% vs. baseline in healthy adults. NAD+ metabolism was dose-dependent. No serious adverse events at doses up to 1,000mg/day.
Personalized Nutrition by Prediction of Glycemic Responses
Landmark study demonstrating that postprandial glucose responses to identical foods vary dramatically between individuals due to microbiome composition, genetics, and lifestyle. Personalized dietary interventions outperformed standard guidelines.
Time-Restricted Eating and Metabolic Health: RCT
16:8 time-restricted eating in adults with metabolic syndrome over 3 months significantly improved fasting glucose, insulin resistance, blood pressure, and visceral fat vs. calorie-matched controls without time restriction.
Spermidine Induces Autophagy and Extends Lifespan
Exogenous spermidine extends lifespan in yeast, flies, worms, and mice via autophagy induction. Dietary spermidine inversely associated with cardiovascular mortality in human cohort (n=829). Epigenetic anti-aging effects proposed.
Mediterranean Diet and Telomere Length
Greater adherence to Mediterranean diet significantly associated with longer telomere length — a marker of biological aging — in 4,676 healthy women. Each 1-SD increase in MDS score corresponded to 1.5 years less biological aging.
Cold Water Immersion and Muscle Recovery
Systematic review and meta-analysis: CWI significantly reduces DOMS up to 96h post-exercise and accelerates recovery of strength and power. Optimal protocol: 11–15°C for 11–15 minutes. Note: may blunt long-term hypertrophy adaptations.
Red Light Therapy and Mitochondrial Function
Photobiomodulation (660–850nm) stimulates cytochrome c oxidase, increasing ATP production and reducing mitochondrial ROS. Human studies show benefits for muscle recovery, cognitive performance, and wound healing. Longevity effects in humans remain speculative.
Vitamin D₃ vs D₂ Supplementation Efficacy
D₃ is ~87% more potent than D₂ in raising and maintaining serum 25(OH)D. Deficiency (<20 ng/mL) associated with 35% higher all-cause mortality. 2,000 IU D₃/day adequate for most adults; 4,000 IU for deficient individuals.
Dietary Protein and Muscle Health in Aging
Older adults require 1.0–1.2 g/kg protein/day minimum (double WHO recommendation) to maintain muscle mass. Anabolic resistance with aging requires higher leucine thresholds (~3–4g) and larger protein doses (40–50g) per meal.
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