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Article contents Abstract Introduction Urolithin A: sources, dosage and mechanism of action Spermidine: sources, dosage and mechanism of action Urolithin A and spermidine in autophagy and mitophagy: studies in vitro In vivo studies on urolithin A and spermidine Clinical studies on urolithin A and spermidine Conclusions Financial support Competing interests Authorship Consent for publication Declaration of generative AI and AI-assisted technologies in the writing process References Distinct roles of urolithin A and spermidine in mitophagy and autophagy: implications for dietary supplementation Published online by Cambridge University Press: 17 December 2025 Abstract Introduction Urolithin A: sources, dosage and mechanism of action Spermidine: sources, dosage and mechanism of action Urolithin A and spermidine in autophagy and mitophagy: studies in vitro In vivo studies on urolithin A and spermidine Clinical studies on urolithin A and spermidine Conclusions Financial support Competing interests Authorship Consent for publication Declaration of generative AI and AI-assisted technologies in the writing process References Abstract The increasing focus on longevity and cellular health has brought into the spotlight two key compounds, urolithin A (UroA) and spermidine, for their promising roles in autophagy and mitophagy

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Grover PL, Sims P