🕸️Dr.T, PhD

Dose. Dose. Dose. Urolithin a. *Dose-dependency holds for muscle outcomes tied to mitophagy: 1,000 mg/day often outperforms 500 mg for endurance, strength, and performance improvements. *In the first-in-human study (elderly adults) single doses up to 2,000 mg were safe and bioavailable (plasma levels rose dose-dependently). *Daily doses of 500 mg and 1,000 mg for 4 weeks upregulated mitochondrial genes and mitophagy-related markers in skeletal muscle, while 250 mg showed little effect. *Benefits included better mitochondrial biomarkers (e.g., acylcarnitines) are stronger at higher doses. *UA is cardioprotective potential primarily through mitophagy and mitochondrial quality control in heart tissue. In a 4-month trial (1 g/day or 1,000 mg in older adults), UA significantly lowered plasma ceramides (predictors of CV risk) and other markers like acylcarnitines/C-reactive protein, linked to better mitochondrial efficiency. *Lower doses (e.g., 500 mg) have shown some benefits but are less robust for exercise performance or strong biomarker shifts; one heart failure pilot noted limited ejection fraction improvement possibly due to dose/duration. Practical Considerations Effective range: 500–1,000 mg/day (often as Mitopure or similar supplements) is the most studied and effective for mitophagy biomarkers and related outcomes. It's generally safe and well-tolerated, with linear bioavailability up to ~1,000–2,000. Below ~500 mg, effects on mitophagy markers and functional improvements are minimal or inconsistent. Higher doses yield stronger plasma exposure, gene expression changes, and outcomes like reduced fatigue or CV risk markers. Duration: Benefits often require 4+ weeks (chronic use). In summary, dose is a critical variable—aim for 1,000 mg/day for meaningful mitophagy and potential CV benefits, based on current evidence.