Mini review synthesizes PQQ and spermidine roles in healthy longevity mechanisms

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Frontiers in Medicine Published May 15, 2026 Medically reviewed May 15, 2026 DOI ↗ By Dr. Sofia Müller, MD · Lifespan & Whole-Person Care

Key Takeaway

Consider PQQ and spermidine as mechanistic agents for healthy longevity with unreported clinical data.

This mini review examines the potential mechanisms of dietary pyrroloquinoline quinone (PQQ) and spermidine (SPD) regarding healthy longevity. The scope focuses on biological pathways rather than clinical trial outcomes. The authors describe how PQQ enhances mitochondrial biogenesis and bioenergetic capacity. Additionally, the text notes that SPD induces macroautophagy and preserves proteostasis. These findings are presented as mechanistic observations rather than proven clinical benefits.

The review further discusses how PQQ and SPD converge on key hallmarks of aging. These include genomic instability, deregulated nutrient sensing, mitochondrial dysfunction, and chronic inflammation. The authors suggest these compounds target these specific biological processes. No absolute numbers, p-values, or confidence intervals were provided to quantify these effects. The setting and population details were not reported in the source material.

Safety and tolerability data were not reported for these interventions. The review does not provide specific adverse event rates or discontinuation data. Consequently, the practice relevance remains theoretical based on mechanistic plausibility. Clinicians should interpret these findings as preliminary biological hypotheses rather than established treatment guidelines. Further research with defined populations is needed to confirm clinical utility.

Study Details

Study typeSystematic review

EvidenceLevel 1

PublishedMay 2026

View Original Abstract ↓

BackgroundAging is a multifaceted biological process driven by interconnected cellular and molecular hallmarks. As geroscience increasingly prioritizes healthspan over lifespan, nutritional interventions targeting multiple aging mechanisms have gained attention as accessible strategies to mitigate age-related functional decline.ObjectiveThis mini review synthesizes recent evidence on how the bioactivities of two food-derived geroprotective compounds, pyrroloquinoline quinone (PQQ) and spermidine (SPD), intersect with the hallmarks of aging and their distinct and overlapping roles in maintaining cellular homeostasis.FindingsPQQ primarily functions as a mitochondrial and redox regulator, enhancing mitochondrial biogenesis and bioenergetic capacity through the AMP-activated protein kinase (AMPK) and sirtuin1 (SIRT1)/peroxisome proliferator-activated receptor gamma coactivator 1-alpha pathways. In contrast, SPD acts as a key regulator of cellular quality control by inducing macroautophagy and preserving proteostasis, largely through modulation of histone and autophagy-related protein acetylation. These complementary mechanisms converge on several key hallmarks of aging, including genomic instability, deregulated nutrient sensing, mitochondrial dysfunction, and chronic inflammation.ConclusionThe anti-aging mechanisms of PQQ and SPD originate from distinct upstream biochemical processes but converge on shared signaling hubs, including the AMPK/SIRT1 axis and autophagy-related networks. This convergence suggests a coordinated network-level complementarity that may offer a more robust intervention against age-related decline than targeting independent pathways alone.