Spermidine

Key Benefits#

• Induces autophagy — cellular self-cleaning
• Extends lifespan in yeast, flies, worms, and mice
• Reduces cardiovascular aging and arterial stiffness
• Reduces all-cause mortality (human epidemiological data)
• Neuroprotective: reduces amyloid and tau pathology
• Promotes hair growth (anagen phase activation)
• Reduces age-related immune decline
• Improves memory in aging models

Mechanism of Action#

Spermidine induces autophagy — the cellular 'self-cleaning' process that removes damaged proteins, organelles, and intracellular debris. It inhibits EP300 acetyltransferase, leading to hypoacetylation of histones and activation of autophagy genes (ATG5, ATG7, Beclin-1). In the cardiovascular system, spermidine reduces arterial stiffness by preventing cross-linking of extracellular matrix proteins. In the brain, it promotes mitophagy (removal of dysfunctional mitochondria), reduces amyloid-beta accumulation, and maintains synaptic plasticity. Spermidine levels decline with age, correlating with reduced autophagy and accelerated aging.

Dosing Protocols#

Side Effects#

• Generally very well tolerated
• Rare: mild GI discomfort at high doses
• May temporarily reduce some gut bacteria species
• Rare: headache at initiation

Contraindications#

No significant contraindications. Wheat germ-sourced supplements: avoid in celiac disease unless certified gluten-free. Insufficient data in pregnancy.

Storage#

Capsules/powder: room temperature in airtight container away from moisture and light. Typically 2-year shelf life.

Featured In Stacks#

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   In Vitro Antioxidant and Cellular Activities of Functionalized Spermidine by Conjugating with Ascorbic Acid in Human Skin Cells

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    The polyamine inhibitor SAM486A increases the efficacy of adagrasib in non-small cell lung cancer cells harboring KRAS(G12C) mutation

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    Integrated transcriptomic and metabolomic analyses elucidate the effects of exogenous spermidine priming on seed germination and seedlings growth of Elymus sibiricus under salt stress

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    Gut Commensal Phocaeicola vulgatus AF107-22 Alleviates Obesity-Induced Metabolic Syndrome via Promoting Gut Microbiota-Derived Spermidine Synthesis

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    Spermine: A Hemoglobin Modifier That Reduces Autoxidation and Regulates Oxygen Delivery

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    Recruitment of bifunctional regulator thermospermine to methylated ribosomes directs xylem fate

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    The role of spermidine in plants and humans: a pathway from climate change adaptation to health benefits

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27. 27.
    Spermidine-functionalized Janus hydrogel microneedles inhibit ferroptosis and promote healing of oral ulcers

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    Region-specific metabolomics reveals the mechanisms underlying melanin synthesis in Pacific oyster (Crassostrea gigas) mantle

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    Divergent and overlapping roles of homospermidine and spermidine in Sinorhizobium meliloti physiology and symbiotic performance

    Becerra-Rivera VA, Ide AA, Reyes-González AR, Dunn MF · Microbiology (Reading, England) · 2026PubMed Verified

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    Natural extracts and bioactive compounds against L3 larvae of Anisakis spp: in vitro and ex vivo evaluation and potential application in marinated products

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36. 36.
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37. 37.
    Spermidine-Based Carbon Quantum Dots Alleviate Liver Sinusoidal Endothelial Dysfunction by Inducing LSEC-Derived NO to Ameliorate Hepatic Fibrosis and Portal Hypertension

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    SS-31 improves the quality of maternally aged oocytes by ameliorating mitochondrial function and metabolism

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    Peroxisome deficiency impacts metabolites of lysine, lipid, and polyamine metabolism in Saccharomyces cerevisiae

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    Combining sorafenib with spermine and sphingosine synergistically enhances anticancer efficacy by modulating metabolic pathways and gut microbiome in hepatocellular carcinoma

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    Elaidic acid suppresses hepatocellular carcinoma growth through modulating the production of intestinal Ligilactobacillus murinus-derived spermidine

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    Dynamic Covalent Dual Prodrug Assemblies for Endometritis Therapy via Inflammation Alleviation, Tissue Repair, and Reproductive Function Restoration

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    Bacteroidesfinegoldii and Parabacteroides goldsteinii Mediate Fucoidan-Induced Attenuation of Intestinal Inflammation in Mice Through Betaine- and Spermidine-Related Pathways

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    Metabolomic Subtyping and Machine Learning-Based Diagnosis Reveal Clinical Heterogeneity in Silicosis

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    Spermidine alleviates ethanol-induced hepatocyte ferroptosis by restoring hepatic iron homeostasis via the gut-liver axis

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