Home Ingredients Puremidine™ (Spermidine)
Longevity

Puremidine™ (Spermidine)

Evidence Level
Preliminary
2 Clinical Trials
4 Documented Benefits
1/5 Evidence Score

Puremidine™ (NNB Nutrition) is a highly purified spermidine supplement derived from wheat germ. Spermidine is a naturally occurring polyamine found in all living cells that is involved in autophagy, the cellular process that recycles damaged proteins and organelles. In cell and animal models spermidine can induce autophagy; whether oral supplementation produces meaningful anti-aging effects in humans has not been established. Tissue polyamine levels tend to decline with age. Observational studies report that people whose diets are naturally high in spermidine (from vegetables, whole grains, legumes and cheese) have lower all-cause and cardiovascular mortality, but these are associations only: spermidine intake tracks an overall vegetable-rich diet, and no randomized trial has shown that a spermidine supplement lowers mortality or prevents disease.

Studied Dose 0.9 mg/day spermidine in the SmartAge RCT (1.2 mg/day in an earlier pilot); observational mortality data reflect dietary intake of roughly 10-15 mg/day, not supplement doses.
Active Compound Spermidine (N-(3-aminopropyl)butane-1,4-diamine) — Puremidine™ by NNB Nutrition; wheat germ-derived polyamine.

Benefits

Autophagy induction and cellular rejuvenation

In cell and animal studies spermidine induces autophagy, the pathway also affected by rapamycin, caloric restriction, and fasting, acting partly through hypusination of the translation factor eIF5A. Autophagy clears damaged proteins and mitochondria. These effects are established in laboratory models; direct evidence that oral spermidine extends healthspan in humans is lacking.

Supported by Trial 1, Trial 2

Cardiovascular health and longevity

Prospective observational cohorts (the Bruneck study and a US NHANES analysis) report that people with the highest dietary spermidine intake have lower cardiovascular and all-cause mortality than those with the lowest intake (adjusted hazard ratios about 0.68 to 0.76). This is a dietary association, not a tested effect of the supplement: high-spermidine diets are also rich in vegetables, whole grains and legumes, and no randomized trial of a spermidine supplement has measured cardiovascular outcomes.

Supported by Trial 1

Cognitive function (mixed and largely null trial evidence)

The largest randomized trial (SmartAge: 100 older adults with subjective cognitive decline, 0.9 mg spermidine/day from wheat germ for 12 months) found no significant effect on its primary memory outcome versus placebo (between-group difference -0.03, P = .47), and secondary outcomes were also unchanged, with only exploratory hints on verbal memory and inflammation. An earlier 3-month pilot suggested modest memory gains. Proposed mechanisms (autophagy-mediated clearance of protein aggregates, reduced neuroinflammation) come from laboratory models. Spermidine is not a proven treatment for cognitive decline or dementia.

Supported by Trial 2

Immune system rejuvenation

In laboratory and animal work spermidine enhances autophagy in immune cells. One small placebo-controlled pilot in 40 adults over 65 (6 mg/day for 13 weeks after a COVID-19 vaccine dose) reported enhanced memory B-cell recall and neutralising antibody responses, mainly in people who had responded poorly to the vaccine. This is preliminary single-study evidence that has not been independently replicated, not an established benefit.

Supported by Trial 2, Trial 1

Mechanism of action

1

Autophagy induction via eIF5A hypusination

Spermidine is the unique substrate for hypusination of the translation factor eIF5A — a post-translational modification essential for autophagy gene expression. By driving eIF5A hypusination, spermidine upregulates the transcription of ATG genes (ATG5, ATG7, ATG12, Beclin-1) that initiate autophagosome formation and cargo degradation. This mechanism is distinct from mTOR inhibition or AMPK activation used by other autophagy inducers.

2

Epigenetic effects via histone acetyltransferase inhibition

Spermidine inhibits histone acetyltransferases (HATs), shifting chromatin toward a transcriptionally active state that upregulates longevity-associated genes including sirtuins, FOXO transcription factors, and stress response genes. This epigenetic mechanism mirrors caloric restriction-induced longevity gene expression and contributes to spermidine's broad healthspan-extending effects observed in animal models.

Clinical trials

1
Dietary Spermidine and 20-Year Mortality — Cohort
PubMed

Prospective observational study of 829 participants over 20 years examining dietary spermidine intake and all-cause/cardiovascular mortality. (Am J Clin Nutr — Bruneck Study)

829 adults. 20-year follow-up.

Higher dietary spermidine intake was associated with lower all-cause mortality (adjusted hazard ratio 0.76 per 1-SD higher intake); the mortality difference between the highest and lowest thirds was comparable to being about 5.7 years younger. Critical caveat: observational — cannot establish causation; spermidine intake correlates with overall dietary patterns (vegetables, whole grains, legumes — Mediterranean-style). The 'spermidine for longevity' marketing rests substantially on this association — but clinical trial evidence for clinical benefit is far less established.

2
Spermidine for Cognitive Function in Older Adults — Clinical Trial
PubMed

Randomized, double-blind, placebo-controlled trial (SmartAge) of spermidine supplementation (0.9 mg/day from wheat germ) for 12 months in 100 older adults with subjective cognitive decline. (JAMA Network Open, 2022)

Older adults with cognitive complaints.

No significant effect on the primary memory outcome versus placebo (between-group difference -0.03, 95% CI -0.11 to 0.05, P = .47); secondary outcomes were also unchanged. Exploratory analyses hinted at possible benefits on verbal memory and inflammation that would need confirmation. Small single-center trial (n=100); spermidine is under investigation and is not an established cognitive enhancer.

Side effects and drug interactions

Common Potential side effects

Excellent safety profile; spermidine is naturally present in all food proteins
Very well tolerated at clinical doses (1–10 mg/day)
Mild GI effects at higher doses in rare cases
Long-term supplementation (months) required for measurable autophagy induction and clinical benefits

Important Drug interactions

mTOR inhibitors (rapamycin, everolimus) — additive autophagy induction; monitor in transplant patients
No established significant drug interactions at supplemental doses
Polyamine-sensitive cancers — theoretical concern; consult oncologist before use in active cancer patients

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Frequently asked questions about Puremidine™ (Spermidine)

What is Puremidine?

Puremidine™ (NNB Nutrition) is a highly purified spermidine supplement derived from wheat germ. Spermidine is a naturally occurring polyamine found in all living cells that is involved in autophagy, the cellular process that recycles damaged proteins and organelles.

What is Puremidine used for?

Puremidine is researched primarily for Longevity. In cell and animal studies spermidine induces autophagy, the pathway also affected by rapamycin, caloric restriction, and fasting, acting partly through hypusination of the translation factor eIF5A.

What is the recommended dosage of Puremidine?

The clinically studied dose is 0.9 mg/day spermidine in the SmartAge RCT (1.2 mg/day in an earlier pilot); observational mortality data reflect dietary intake of roughly 10-15 mg/day, not supplement doses. Always follow the product label and check with a healthcare provider for personal advice.

Is Puremidine safe, and does it have side effects?

For most healthy adults, Puremidine is well tolerated at studied doses. Reported effects can include: Excellent safety profile; spermidine is naturally present in all food proteins Very well tolerated at clinical doses (1–10 mg/day) It may also interact with some medications. Puremidine is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Puremidine interact with any medications?

Possible interactions include: mTOR inhibitors (rapamycin, everolimus) — additive autophagy induction; monitor in transplant patients No established significant drug interactions at supplemental doses If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Puremidine?

NutraSmarts rates the evidence for Puremidine as Preliminary (1 out of 5). It is backed by 2 clinical trials and 6 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(6 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Schwarz C, Benson GS, Horn N, Wurdack K, Grittner U, Schilling R, Märschenz S, Köbe T, Hofer SJ, Magnes C, Stekovic S, Eisenberg T, Sigrist SJ, Schmitz D, Wirth M, Madeo F, Flöel A Effects of Spermidine Supplementation on Cognition and Biomarkers in Older Adults With Subjective Cognitive Decline: A Randomized Clinical Trial. JAMA Netw Open. 2022;5(5):e2213875. doi: 10.1001/jamanetworkopen.2022.13875.PubMedUsed to support: SmartAge randomized double-blind trial: 100 older adults with subjective cognitive decline took 0.9 mg/day spermidine (wheat germ) or placebo for 12 months. The primary memory outcome showed no significant difference versus placebo (between-group difference -0.03, P = .47), and secondary outcomes were unchanged; only exploratory analyses hinted at possible verbal-memory and inflammation effects. This is the main interventional human evidence for spermidine and it was largely null.
  2. Schroeder S, Hofer SJ, Zimmermann A, Pechlaner R, Dammbrueck C, Pendl T, et al. Dietary spermidine improves cognitive function. Cell Rep. 2021;35(2):108985. doi: 10.1016/j.celrep.2021.108985.PubMedUsed to support: Study combining a human observational cohort (higher dietary spermidine associated with better cognitive performance) with mouse and Drosophila experiments in which spermidine improved memory and learning via autophagy induction. The causal memory benefit was demonstrated in animals; the human component is an association only.
  3. Madeo F, Eisenberg T, Pietrocola F, Kroemer G Spermidine in health and disease. Science. 2018;359(6374):eaan2788. doi: 10.1126/science.aan2788.PubMedUsed to support: Narrative review in Science summarizing preclinical and epidemiological evidence that spermidine induces autophagy and is associated with cardiovascular and neuroprotective effects. As a review it synthesizes other studies rather than providing direct human trial evidence, and much of the mechanistic work is in cells and animals.
  4. Wu H, Wang J, Jiang H, Liu X, Sun X, Chen Y, Hu C, Wang Z, Han T, Sun C, Wei W, Jiang W The association of dietary spermidine with all-cause mortality and CVD mortality: The U.S. National Health and Nutrition Examination Survey, 2003 to 2014. Front Public Health. 2022;10:949170. doi: 10.3389/fpubh.2022.949170.PubMedUsed to support: US NHANES analysis (23,894 adults, 2,365 deaths) in which higher dietary spermidine intake was associated with lower cardiovascular mortality (hazard ratio 0.68) and all-cause mortality (0.70). The association is observational and driven by spermidine from vegetables, cereals, legumes, nuts and cheese, so it reflects an overall diet pattern rather than a tested effect of a spermidine supplement.
  5. Kiechl S, Pechlaner R, Willeit P, Notdurfter M, Paulweber B, Willeit K, Werner P, Ruckenstuhl C, Iglseder B, Weger S, Mairhofer B, Gartner M, Kedenko L, Chmelikova M, Stekovic S, Stuppner H, Oberhollenzer F, Kroemer G, Mayr M, Eisenberg T, Tilg H, Madeo F, Willeit J. Higher spermidine intake is linked to lower mortality: a prospective population-based study. Am J Clin Nutr. 2018;108(2):371-380. doi: 10.1093/ajcn/nqy102.PubMedUsed to support: Prospective community cohort (Bruneck, 829 adults aged 45 to 84, 20-year follow-up, 341 deaths) in which people with higher dietary spermidine intake had lower all-cause mortality (adjusted hazard ratio 0.76 per 1-SD higher intake), independently replicated in the SAPHIR cohort. This is an observational dietary association, not a test of a spermidine supplement: high-spermidine diets are also rich in vegetables, whole grains and legumes, so the association reflects an overall diet pattern.
  6. Alsaleh G, Ali M, Kayvanjoo AH, Liu F, Moreau T, Bibi S, Luo L, Govender M, Carroll M, Hofer SJ, Klenerman P, Jones LC, Simon AK, et al. Spermidine Mitigates Immune Cell Senescence and Boosts Vaccine Responses in Healthy Older Adults: A Pilot Study. Aging Cell. 2026;25(6):e70545. doi: 10.1111/acel.70545.PubMedUsed to support: Double-blind placebo-controlled pilot in 40 adults over 65 given 6 mg/day oral spermidine for 13 weeks following a SARS-CoV-2 vaccine dose. Supplementation was well tolerated and, among people who had responded poorly to the vaccine, increased spike-specific IgG, memory B-cell recall and neutralising antibody activity. Small single pilot with a surrogate immune endpoint and no clinical outcome, not an established benefit.