Spermidine: The Complete Guide

Overview

Spermidine is a polyamine — a class of organic compounds with multiple amino groups — that is present in every living cell from bacteria to humans. It was first isolated from semen in 1678 by Antonie van Leeuwenhoek, which accounts for its name, though it is ubiquitous across all tissues and is particularly concentrated in rapidly dividing cells.

Polyamines, including spermidine, putrescine, and spermine, play fundamental roles in cell growth, gene expression, protein synthesis, and membrane stabilization. What has made spermidine the subject of intensive research in the past two decades is its identification as one of the most potent naturally occurring inducers of autophagy — the evolutionarily conserved process by which cells degrade and recycle their own damaged or dysfunctional components (Eisenberg et al., 2009).

The landmark finding that spermidine extends lifespan in yeast, flies, worms, and mice — and that it does so through autophagy-dependent mechanisms — generated significant interest in its potential as a longevity compound. Subsequent epidemiological studies in human populations, particularly the Bruneck Study, found that higher dietary spermidine intake was associated with reduced overall mortality and lower rates of cardiovascular disease (Kiechl et al., 2018).

Unlike many compounds studied for longevity, spermidine is not a pharmaceutical agent — it is a normal dietary component. The richest food sources include wheat germ, aged cheese (particularly blue cheese and Parmesan), soybeans, mushrooms, legumes, and fermented foods. Endogenous production of spermidine also occurs via the enzyme ornithine decarboxylase, though both dietary intake and endogenous production decline with age.

Spermidine is available as an over-the-counter dietary supplement, most commonly derived from wheat germ extract. It does not require a prescription. It has not been approved by the FDA as a drug for any specific indication, but it is sold legally as a dietary supplement under DSHEA (Dietary Supplement Health and Education Act) regulations.

Quick Facts

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

How It Works

Spermidine's biological effects stem from its role as a polyamine — a positively charged molecule that interacts with negatively charged cellular structures including DNA, RNA, and cell membranes. Its most studied mechanism of action is the induction of autophagy, but its cellular roles extend well beyond this single pathway.

Autophagy Induction

Autophagy (from the Greek "self-eating") is the process by which cells sequester damaged proteins, dysfunctional mitochondria, and other cellular debris into double-membrane vesicles called autophagosomes, which then fuse with lysosomes for degradation and recycling. Autophagy declines with age, and this decline is implicated in the accumulation of cellular damage that contributes to aging and age-related diseases.

Spermidine induces autophagy primarily by inhibiting the acetyltransferase EP300 (also known as p300), which leads to hypoacetylation of multiple autophagy-related proteins. This mimics the molecular signature of caloric restriction — a well-established longevity intervention — without requiring reduced food intake (Pietrocola et al., 2015). Specifically:

• EP300 inhibition: Spermidine competes with acetyl-CoA at the EP300 active site, reducing acetylation of cytoplasmic proteins including ATG5, ATG7, ATG12, and Beclin-1 — all core components of the autophagy machinery (Pietrocola et al., 2015)
• AMPK activation: Spermidine activates AMP-activated protein kinase (AMPK), a cellular energy sensor that promotes autophagy when energy status is low
• mTOR modulation: Through its effects on AMPK and other pathways, spermidine indirectly inhibits mTORC1 (mechanistic target of rapamycin complex 1), a key negative regulator of autophagy
• TFEB activation: Spermidine promotes nuclear translocation of transcription factor EB (TFEB), which drives expression of autophagy and lysosomal genes

Mitophagy (Mitochondrial Quality Control)

A specialized form of autophagy, mitophagy selectively removes damaged mitochondria. Since mitochondrial dysfunction is a hallmark of aging, spermidine's ability to enhance mitophagy is considered central to its longevity effects. In cardiac tissue, spermidine-induced mitophagy has been shown to preserve mitochondrial function, reduce oxidative stress, and maintain cardiac output in aging mice (Eisenberg et al., 2016).

Anti-Inflammatory Effects

Spermidine reduces chronic low-grade inflammation (often termed "inflammaging") through multiple mechanisms:

• Suppression of NF-κB signaling, a master regulator of inflammatory gene expression
• Reduction of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6) in macrophages
• Enhanced autophagy-mediated clearance of inflammasome components
• Modulation of M1/M2 macrophage polarization toward anti-inflammatory phenotypes (Madeo et al., 2018)

DNA and Chromatin Stabilization

As a polycation, spermidine binds directly to DNA and stabilizes its structure. It also modulates chromatin organization through effects on histone acetylation, influencing gene expression patterns. Spermidine supplementation has been associated with reduced DNA damage markers and enhanced DNA repair capacity in preclinical models.

Cardiovascular Mechanisms

Spermidine's cardiovascular benefits involve several interconnected pathways:

• Cardiac autophagy: Maintenance of cardiomyocyte autophagy preserves cardiac function during aging (Eisenberg et al., 2016)
• Nitric oxide bioavailability: Spermidine enhances endothelial nitric oxide synthase (eNOS) activity, supporting vascular relaxation and blood pressure regulation
• Lipid metabolism: Modulation of cholesterol and triglyceride handling through autophagy-dependent lipophagy
• Arterial stiffness: Preclinical evidence indicates spermidine reduces age-related arterial stiffening by maintaining elastin integrity and reducing vascular calcification

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Research

Model Organism Studies: Lifespan Extension

The foundational spermidine research demonstrated lifespan extension across multiple species:

• Yeast (Saccharomyces cerevisiae): Spermidine supplementation extended chronological lifespan by approximately 3–4-fold. The effect was abolished when autophagy genes (ATG7) were deleted, confirming autophagy dependence (Eisenberg et al., 2009).
• Nematodes (C. elegans): Spermidine extended lifespan by approximately 15%. Again, autophagy-deficient mutants did not show the extension (Eisenberg et al., 2009).
• Fruit flies (Drosophila melanogaster): Spermidine in the diet extended both mean and maximum lifespan. Age-related memory decline was attenuated, with preserved synaptic function (Eisenberg et al., 2009).
• Mice: Late-onset spermidine supplementation (beginning at 18 months of age — equivalent to approximately 55–60 in human years) extended median lifespan by approximately 10%. Cardiac function was preserved, with reduced cardiac hypertrophy and improved diastolic function (Eisenberg et al., 2016).

Cardiovascular Research

• Mouse cardiac aging: Spermidine supplementation reversed age-related cardiac hypertrophy, preserved diastolic function, improved mitochondrial morphology, and enhanced titin phosphorylation (a key determinant of cardiac stiffness). These effects were autophagy-dependent — cardiac-specific autophagy knockout abolished the benefits (Eisenberg et al., 2016).
• Arterial aging in mice: Spermidine reduced arterial stiffness and oxidative stress in aged mice, with improvements in endothelium-dependent dilation (Eisenberg et al., 2016).
• Bruneck Study (human epidemiology): In a prospective population-based cohort of 829 participants followed over 20 years, higher dietary spermidine intake (assessed via food-frequency questionnaires) was associated with reduced overall mortality (hazard ratio 0.77 for the highest vs. lowest tertile). The association was particularly strong for cardiovascular mortality and was independent of age, sex, caloric intake, and other dietary factors (Kiechl et al., 2018).

Cognitive Function and Neurodegeneration

• Drosophila memory: Spermidine supplementation protected against age-related memory impairment in fruit flies by maintaining synaptic autophagy and preserving presynaptic active zone architecture (Gupta et al., 2013).
• Mouse models of neurodegeneration: Spermidine reduced alpha-synuclein toxicity and tau phosphorylation in mouse models relevant to Parkinson's and Alzheimer's diseases. These effects correlated with enhanced neuronal autophagy (Madeo et al., 2018).
• SmartAge trial (human): A randomized, double-blind, placebo-controlled Phase 2 trial in older adults with subjective cognitive decline found that spermidine supplementation (1.2 mg/day from wheat germ extract for 3 months) was associated with trends toward improved memory performance, though the study was not powered for definitive efficacy conclusions (Wirth et al., 2018).

Cancer

The relationship between spermidine and cancer is complex. Polyamines are elevated in rapidly dividing cells, including tumors, which has raised concerns about polyamine supplementation promoting cancer growth. However:

• Epidemiological data from the Bruneck Study did not show increased cancer risk with higher spermidine intake (Kiechl et al., 2018)
• Spermidine-induced autophagy enhances immunosurveillance — the immune system's ability to detect and eliminate pre-cancerous cells (Madeo et al., 2018)
• In mouse models, spermidine supplementation reduced tumor incidence in some contexts, potentially through enhanced autophagy-mediated immune function
• The question remains unresolved, and individuals with active malignancies should consult their oncologist before supplementation

Metabolic Health

• Insulin sensitivity: Spermidine improved glucose tolerance and insulin sensitivity in high-fat-diet-fed mice, with enhanced autophagy in adipose tissue and liver (Madeo et al., 2018)
• Obesity: Spermidine supplementation reduced adiposity in mouse models of diet-induced obesity, potentially through enhanced lipophagy (autophagy of lipid droplets)
• Non-alcoholic fatty liver disease (NAFLD): Spermidine reduced hepatic steatosis and inflammation in mouse NAFLD models

Limitations of the Research

• Epidemiological ≠ causal: The Bruneck Study and similar cohorts demonstrate association, not causation. People with higher spermidine intake may differ from those with lower intake in other health-relevant ways.
• Animal-to-human translation: Lifespan extension in yeast, worms, and flies does not directly predict human longevity effects. Even the mouse data requires cautious interpretation.
• Dose extrapolation: Doses used in animal studies, when scaled by body weight, often exceed typical human supplement doses.
• Small human trials: The SmartAge trial and similar studies have small sample sizes and short durations insufficient for definitive efficacy or long-term safety conclusions.
• Confounding by diet quality: High spermidine intake correlates with Mediterranean-type diets rich in vegetables, legumes, and whole grains — dietary patterns with independently established health benefits.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Uses

Regulatory Status

Spermidine is sold as a dietary supplement, not an FDA-approved drug. Under DSHEA regulations, it can be marketed for "structure and function" claims (e.g., "supports cellular health") but cannot claim to treat, cure, or prevent any disease. Supplement manufacturers are responsible for product safety and label accuracy, but products are not subject to pre-market FDA approval.

Common Applications

Dietary Sources vs. Supplementation

Spermidine can be obtained through diet or supplementation. Dietary intake in Western populations averages approximately 7–12 mg/day, though individual variation is substantial. The richest dietary sources include:

Supplementation typically provides 1–6 mg/day of spermidine, usually derived from wheat germ extract. Whether supplemental spermidine at these doses provides benefits beyond a spermidine-rich diet has not been established through controlled trials.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Dosing

Commonly Available Supplement Doses

Sources: Wirth et al., 2022 — Spermidine supplementation RCT dosing (SmartAge) · Schwarz et al., 2018 — Safety and tolerability of spermidine supplementation · Kiechl et al., 2018 — Dietary spermidine intake and mortality (Bruneck Study)

Research Doses

• SmartAge trial: 1.2 mg/day spermidine from wheat germ extract for 3 months (Wirth et al., 2018)
• Mouse lifespan studies: Approximately 3 mM spermidine in drinking water, which translates to estimated human-equivalent doses of 5–10 mg/day depending on scaling methodology (Eisenberg et al., 2016)
• Bruneck Study (epidemiological): The highest tertile of dietary spermidine intake (associated with reduced mortality) corresponded to approximately 12+ mg/day from food sources (Kiechl et al., 2018)

Timing and Administration

• Time of day: No established optimal timing. Autophagy is enhanced during fasting states, so some practitioners suggest taking spermidine in the morning or during intermittent fasting windows, though no data directly supports this practice.
• With or without food: Most products can be taken with or without food. Wheat germ extract capsules are commonly taken with meals to improve tolerance.
• Duration: No established treatment duration. Spermidine is a natural dietary component, and long-term supplementation has not been associated with adverse effects in available data. The Bruneck Study epidemiological data reflects habitual dietary intake over decades.

Combining with Diet

Supplement doses (1–6 mg/day) can be combined with dietary spermidine sources. There is no established upper limit for total daily polyamine intake from food and supplements combined. Individuals seeking to maximize spermidine intake through diet may consider increasing consumption of wheat germ, aged cheese, soybeans, mushrooms, and green peas.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Results: What Users Report

Reported Timeline

Sources: Wirth et al., 2018 — SmartAge trial: spermidine and memory in older adults (Cortex) · Kiechl et al., 2018 — Higher spermidine intake linked to lower mortality (Am J Clin Nutr) · Eisenberg et al., 2016 — Cardioprotection and lifespan extension by spermidine (Nature Medicine)

What Can and Cannot Be "Felt"

An important distinction exists between spermidine's documented mechanisms and what users can subjectively perceive:

• Cannot be felt: Autophagy induction, mitophagy enhancement, epigenetic changes, cardiovascular remodeling, immune surveillance improvement. These processes occur at the cellular level and produce benefits over months to years, not days.
• Potentially noticeable: Energy levels (if mitochondrial function improves), sleep quality (polyamines influence circadian regulation), digestive comfort, cognitive clarity (if neuronal autophagy improves), skin and hair quality.

Biomarker Tracking

For individuals interested in objectively assessing spermidine's effects, the following biomarkers may be relevant (consult a healthcare provider for interpretation):

• Blood polyamine levels: Spermidine, spermine, and putrescine can be measured in blood to confirm absorption
• hs-CRP: High-sensitivity C-reactive protein as an inflammation marker
• Fasting insulin and HOMA-IR: Metabolic health indicators
• Lipid panel: Cholesterol and triglyceride levels
• Blood pressure: Cardiovascular health indicator
• Cognitive testing: Standardized cognitive assessments for individuals concerned about cognitive decline

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Side Effects

Reported Side Effects

Safety Profile

Spermidine's safety profile is informed by several lines of evidence:

• Dietary exposure history: Spermidine is consumed daily by all humans through normal diet. Average intakes of 7–12 mg/day are common in populations with no associated adverse effects. Populations consuming Mediterranean and Japanese diets — which tend to be higher in polyamines — have longer life expectancies on average.
• Endogenous production: The human body produces spermidine endogenously. Supplementation adds to, rather than introduces, a compound already present in every cell.
• Clinical trial safety: In the SmartAge trial and related studies, spermidine supplementation at 1.2 mg/day showed no significant adverse events compared to placebo over 3 months (Wirth et al., 2018).
• Animal toxicology: Long-term spermidine supplementation in mice (lifelong exposure) showed no organ toxicity, hematologic abnormalities, or increased tumor incidence (Eisenberg et al., 2016).

Theoretical Concerns

• Polyamines and cancer: Polyamine levels are elevated in cancer cells, which has raised theoretical concerns about exogenous polyamine supplementation potentially supporting tumor growth. However, the Bruneck Study did not show increased cancer incidence with higher dietary spermidine intake, and spermidine's autophagy-enhancing effects may improve immune surveillance against cancer. The question remains under active investigation (Madeo et al., 2018).
• Drug interactions: No formal drug interaction studies have been conducted. Spermidine's effects on autophagy could theoretically interact with mTOR inhibitors (rapamycin/sirolimus), chemotherapy agents, or immunosuppressants. Consult a healthcare provider if taking these medications.
• Pregnancy and breastfeeding: No safety data for supplemental spermidine during pregnancy or lactation. Dietary spermidine is consumed normally during pregnancy without known concerns.

Contraindications

• Wheat allergy: Wheat germ-derived supplements may trigger allergic reactions in individuals with wheat allergy
• Active cancer (use caution): Consult oncologist before supplementation due to theoretical polyamine-cancer interactions
• Organ transplant recipients: Autophagy modulation could theoretically interact with immunosuppressive regimens — consult transplant team

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Regulatory Status

United States

• Classification: Dietary supplement under the Dietary Supplement Health and Education Act (DSHEA) of 1994
• FDA approval: Not approved as a drug for any indication. Supplements are not subject to pre-market FDA approval.
• Manufacturing standards: Supplement manufacturers must comply with current Good Manufacturing Practices (cGMP) for dietary supplements (21 CFR Part 111), though enforcement varies
• Claims: Can make "structure/function" claims (e.g., "supports cellular health") but cannot claim to treat, cure, or prevent disease
• Availability: Available over the counter — no prescription required

European Union

• Spermidine supplements are available in EU member states, generally classified as food supplements
• Novel Food Regulation (EU 2015/2283) may apply to concentrated spermidine products depending on the source and concentration
• Wheat germ extract as a source of spermidine has a history of consumption in Europe and is generally not classified as a novel food

WADA Status

Spermidine is not prohibited by WADA. As a naturally occurring dietary component found in common foods, it is not listed on the WADA Prohibited List. Athletes may use spermidine supplements without anti-doping concerns.

Quality and Standardization

Unlike pharmaceutical products, dietary supplements vary in quality between manufacturers. For spermidine supplements, considerations include:

• Standardization: Products should state the actual spermidine content per serving, not just wheat germ extract weight
• Third-party testing: Products tested by independent laboratories (USP, NSF, ConsumerLab) provide greater quality assurance
• Source transparency: Wheat germ extract is the most common and best-studied source; synthetic spermidine is also available
• Allergen labeling: Wheat germ-derived products should clearly label wheat allergen content

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Cost

Typical Pricing

Insurance Coverage

Spermidine supplements are not covered by insurance. As a dietary supplement, it cannot be billed under any drug benefit or prescription plan. All costs are out-of-pocket. However, the cost is substantially lower than most pharmaceutical or compounded peptide products.

Cost Comparison: Spermidine vs. Other Longevity Interventions

Cost-Effectiveness Considerations

• Dietary approach: Increasing spermidine intake through food (wheat germ, aged cheese, soybeans, mushrooms) provides spermidine along with other nutrients at no additional supplement cost. The Bruneck Study's mortality associations were based on dietary spermidine — not supplements.
• Dose matters: Higher-dose products ($40–$60/month) are not necessarily more cost-effective than lower-dose products combined with dietary sources.
• Duration: Spermidine is typically used as a long-term supplement, so annualized costs ($300–$720/year) should be considered.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Questions & Answers

Question: Does spermidine extend human lifespan?

Answer: This has not been demonstrated in a controlled clinical trial. Spermidine extends lifespan in yeast, worms, flies, and mice through autophagy-dependent mechanisms (Eisenberg et al., 2009; Eisenberg et al., 2016). Epidemiological data from the Bruneck Study shows that higher dietary spermidine intake is associated with reduced mortality in humans (Kiechl et al., 2018). However, epidemiological association does not prove causation, and a randomized controlled trial of spermidine's effect on human lifespan would require decades and has not been attempted.

Myth: Spermidine is the same as sperm.

Answer: No. Spermidine was first isolated from semen in 1678, which is the origin of its name, but it is present in all living cells — plant and animal. The richest dietary sources are wheat germ, soybeans, aged cheese, and mushrooms. Commercially available spermidine supplements are derived from wheat germ extract, not animal sources.

Question: Can I get enough spermidine from food alone?

Answer: Potentially. The Bruneck Study's mortality associations were based entirely on dietary spermidine — not supplements. Individuals in the highest intake tertile consumed approximately 12+ mg/day from food. This is achievable with a diet rich in wheat germ, aged cheese, legumes, and mushrooms (Kiechl et al., 2018). Whether supplements provide additional benefit beyond a spermidine-rich diet has not been established.

Myth: Spermidine causes cancer.

Answer: This is a legitimate theoretical concern that has not been supported by available evidence. Polyamine levels are elevated in cancer cells because rapidly dividing cells require polyamines for growth. However, exogenous spermidine induces autophagy, which enhances immune surveillance against pre-cancerous cells. The Bruneck Study found no association between higher dietary spermidine intake and increased cancer incidence (Kiechl et al., 2018). Lifelong spermidine supplementation in mice did not increase tumor incidence (Eisenberg et al., 2016). Nevertheless, individuals with active malignancies should consult their oncologist before supplementation (Madeo et al., 2018).

Question: Is spermidine like rapamycin?

Answer: Spermidine and rapamycin both induce autophagy, but through different mechanisms. Rapamycin directly inhibits mTORC1 (a kinase complex that suppresses autophagy). Spermidine primarily inhibits the acetyltransferase EP300, leading to protein hypoacetylation and autophagy induction (Pietrocola et al., 2015). Rapamycin is a prescription immunosuppressant with a well-characterized side effect profile. Spermidine is a dietary supplement with a more favorable safety profile but less clinical data. They are not interchangeable.

Question: Do spermidine supplements actually contain spermidine?

Answer: Product quality varies between manufacturers. Some independent analyses have found that certain products contain less spermidine than labeled, while others are accurately dosed. Products that provide third-party certificates of analysis (COA) and are tested by independent laboratories (USP, NSF, ConsumerLab) provide greater quality assurance. Wheat germ extract products also contain other polyamines (spermine, putrescine) that may contribute to biological effects.

Myth: Spermidine is just a fad supplement.

Answer: Spermidine's research base is more substantial than many supplements marketed for longevity. Key differentiators include: (1) a clearly defined molecular mechanism (EP300 inhibition → autophagy), (2) lifespan extension across four model organisms, (3) a prospective 20-year epidemiological study showing mortality reduction in humans, and (4) the compound is a normal dietary constituent with a long history of safe consumption. That said, no randomized controlled trial has demonstrated that spermidine supplementation extends human lifespan or prevents specific diseases. The evidence is promising but not conclusive.

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.

Key Takeaways

Based on the available evidence:

• Spermidine is a naturally occurring polyamine found in all living cells and abundant in common foods including wheat germ, aged cheese, soybeans, and mushrooms. It is one of the most potent known dietary inducers of autophagy — the cellular self-cleaning process.
• Lifespan extension has been demonstrated in yeast, worms, flies, and mice, with effects dependent on functional autophagy pathways. These findings represent some of the most consistent longevity data for any naturally occurring compound (Eisenberg et al., 2009; Eisenberg et al., 2016).
• Epidemiological data supports cardiovascular benefits. The Bruneck Study found that higher dietary spermidine intake was associated with reduced overall and cardiovascular mortality in a 20-year prospective cohort (Kiechl et al., 2018).
• Human clinical trial data is limited. The SmartAge trial showed trends in cognitive function with spermidine supplementation, but larger, longer trials are needed for definitive efficacy conclusions (Wirth et al., 2018).
• The safety profile is favorable. As a normal dietary component consumed by all humans, spermidine has a long history of safe exposure. Clinical trial data and animal toxicology studies support tolerability. Theoretical concerns about polyamines and cancer have not been supported by epidemiological data.
• It is available OTC as a dietary supplement at $25–$60/month, typically derived from wheat germ extract. No prescription is required. It is not a controlled substance and is not prohibited by WADA.
• Dietary intake may be as relevant as supplementation. The strongest human data (Bruneck Study) reflects dietary spermidine, not supplements. A diet rich in wheat germ, aged cheese, legumes, and mushrooms provides meaningful spermidine intake.

Questions to Ask a Provider

• Is spermidine supplementation appropriate given my health status and current medications?
• Should I prioritize dietary spermidine sources, supplementation, or both?
• Are there any interactions with my current medications, particularly immunosuppressants or chemotherapy?
• What biomarkers could I track to assess response?
• How does spermidine fit with other longevity-oriented interventions I may be considering?
• Do I have any contraindications, such as active cancer or wheat allergy?

Sources & Further Reading

Foundational Research

• Eisenberg T, Knauer H, Schauer A, et al. (2009) — "Induction of autophagy by spermidine promotes longevity" — Nature Cell Biology, 11(11):1305-1314
• Eisenberg T, Abdellatif M, Schroeder S, et al. (2016) — "Cardioprotection and lifespan extension by the natural polyamine spermidine" — Nature Medicine, 22(12):1428-1438

Reviews

• Madeo F, Eisenberg T, Pietrocola F, Kroemer G (2018) — "Spermidine in health and disease" — Science, 359(6374):eaan2788

Epidemiological Studies

• Kiechl S, Pechlaner R, Willeit P, et al. (2018) — "Higher spermidine intake is linked to lower mortality: a prospective population-based study" — American Journal of Clinical Nutrition, 108(2):371-380

Mechanism of Action

• Pietrocola F, Lachkar S, Enot DP, et al. (2015) — "Spermidine induces autophagy by inhibiting the acetyltransferase EP300" — Cell Death & Differentiation, 22(3):509-516

Cognitive Function

• Wirth M, Benson G, Horn C, et al. (2018) — "The effect of spermidine on memory performance in older adults at risk for dementia: A randomized controlled trial" — Cortex, 109:181-188
• Gupta VK, Scheunemann L, Eisenberg T, et al. (2013) — "Restoring polyamines protects from age-induced memory impairment in an autophagy-dependent manner" — Nature Neuroscience, 16(10):1453-1460

Regulatory

• FDA: Dietary Supplements Overview
• WADA: Prohibited List

This content is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider.