Supplement: Espermidina

What It Is

Spermidine is a polyamine, a small molecule that your own cells make, that gut bacteria also make, and that you get from food. It was first found in semen, the source of its name, but it sits in tissues throughout the body. It turns up in almost everything you eat, most richly in wheat germ, then whole grains, legumes, mushrooms, aged cheese and fermented soy foods such as natto. Your tissue levels of it fall as you age. The reason it draws attention is one well-studied action: it switches on autophagy. In laboratory organisms, that action extends life.

What It Does

In worms, flies, yeast and mice, spermidine turns on autophagy and lengthens life. The same experiments show the life extension depends on that autophagy: block the recycling and the benefit disappears. In aged mice it also keeps the heart from stiffening. These results hold across species, and they are why spermidine moved from a biochemical curiosity to a longevity candidate. The key papers appeared in 2009 and 2016.

People with more spermidine in their diet live modestly longer. That is an observational pattern in people who tend to eat and live well in other ways, so it cannot prove the molecule did anything. When the compound was given as a supplement and tested directly, the one adequately sized trial found no effect on memory, its main measure. The dietary cohort was published in 2018, the supplement trials after that.

Taking spermidine in the hope of slowing your own aging is an experiment with an effect no human trial has measured.

The Research & Studies

Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.

How it works

La espermidina activa la autofagia, y bloquear la autofagia elimina su beneficio de longevidadModerate · mixed

In plain terms

La espermidina activa la autofagia, el proceso que una célula usa para eliminar y reciclar sus propias partes desgastadas, y ese interruptor es lo que le permite alargar la vida en organismos de laboratorio simples. Cuando los investigadores bloquean la autofagia, el efecto de prolongación de la vida desaparece.

In detail

Eisenberg et al. (2009, Nature Cell Biology) mostraron que la espermidina inhibe la actividad de la histona acetiltransferasa, desencadena la autofagia, y alarga la vida en levaduras, moscas, gusanos y células inmunitarias humanas en cultivo. El bloqueo genético o farmacológico de la autofagia eliminó el beneficio de longevidad, estableciendo la autofagia como el mecanismo mediador, no un correlato. Esta es la base mecanística bien caracterizada del interés en la espermidina.

The study · 1

Eisenberg et al., Induction of autophagy by spermidine promotes longevity · Nat Cell Biol 2009;11(11):1305-1314

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

Cognition

Sin beneficio en la memoria con 0.9 mg/día de espermidina a lo largo de un año en 100 adultos mayoresModerate · no effect

In plain terms

En el mayor ensayo hasta la fecha, los adultos mayores con quejas de memoria que tomaron a diario un suplemento de espermidina de germen de trigo durante un año no obtuvieron mejores resultados en la prueba de memoria principal que quienes tomaron un placebo.

In detail

El ensayo SmartAge (Schwarz et al. 2022, JAMA Network Open) aleatorizó a 100 adultos de 60 a 90 años (49 % mujeres) a 0.9 mg/día de espermidina de germen de trigo o placebo durante 12 meses. El resultado principal, la discriminación mnemónica en la Tarea de Similitud Mnemónica, no mostró diferencia entre los grupos (-0.03; IC del 95 %: -0.11 a 0.05; P = 0.47), y los resultados secundarios no cambiaron. Los análisis exploratorios sugirieron posibles efectos sobre la memoria verbal y la inflamación que, según los autores, necesitaban confirmación con dosis más altas.

The study · 1

Schwarz et al., Effects of Spermidine Supplementation on Cognition and Biomarkers in Older Adults With Subjective Cognitive Decline (SmartAge trial) · JAMA Netw Open 2022;5(5):e2213875

Un estudio piloto con 30 personas sugirió una ganancia de memoria (d de Cohen 0.77) que el ensayo más amplio no confirmóPreliminary

In plain terms

Un pequeño ensayo de tres meses con 30 adultos mayores sugirió que un suplemento de espermidina ayudaba un poco a la memoria. El estudio era demasiado pequeño para confiar en él, y un seguimiento más amplio no lo confirmó.

In detail

Wirth et al. (2018, Cortex) realizaron un estudio piloto de fase IIa en 30 adultos mayores cognitivamente intactos con deterioro cognitivo subjetivo, usando un extracto vegetal rico en espermidina durante tres meses. La discriminación mnemónica mejoró en el grupo de espermidina con un tamaño del efecto medio (d de Cohen de aproximadamente 0.77), aunque los intervalos de confianza eran amplios y llegaban a cero. Los autores lo plantearon como una señal por validar, que el posterior ensayo SmartAge, más amplio, no logró confirmar en su criterio de valoración principal.

The study · 1

Wirth et al., The effect of spermidine on memory performance in older adults at risk for dementia: a randomized controlled trial · Cortex 2018;109:181-188

Longevity And Mortality

La espermidina alarga la vida en levaduras, moscas, gusanos y ratonesPreliminary

In plain terms

Alimentar con espermidina ayuda a las levaduras, moscas, gusanos y ratones a vivir más tiempo. Este es un resultado animal y no se ha demostrado que haga vivir más tiempo a las personas.

In detail

La prolongación de la vida por la espermidina se reportó primero en levaduras, moscas y gusanos (Eisenberg et al. 2009) y se extendió a mamíferos por Eisenberg et al. (2016, Nature Medicine), donde la espermidina oral aumentó la supervivencia en ratones y se asoció con una mayor autofagia y mitofagia. Muchas intervenciones alargan la vida de roedores e invertebrados sin nunca replicarse en humanos.

The studies · 2

Eisenberg et al., Induction of autophagy by spermidine promotes longevity · Nat Cell Biol 2009;11(11):1305-1314

Eisenberg et al., Cardioprotection and lifespan extension by the natural polyamine spermidine · Nat Med 2016;22(12):1428-1438

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

Una mayor espermidina dietética se corresponde con menor mortalidad, razón de riesgo instantáneo de 0.76 por desviación estándar (observacional)Preliminary

In plain terms

Los adultos que comían más alimentos ricos en espermidina murieron a tasas más bajas a lo largo de 20 años, y la brecha entre las ingestas más altas y más bajas fue aproximadamente tan grande como ser varios años más joven. Este es un patrón observado, no una prueba de que la espermidina lo causara.

In detail

Kiechl et al. (2018, American Journal of Clinical Nutrition) siguieron a 829 participantes del estudio Bruneck (de 45 a 84 años, 49.9 % hombres) con cuestionarios validados y repetidos de frecuencia alimentaria; se produjeron 341 muertes a lo largo de 20 años. El cociente de riesgo ajustado por edad, sexo y calorías para la muerte por cualquier causa por cada 1 DE de mayor ingesta de espermidina fue de 0.74 (IC del 95 %: 0.66-0.83), y de 0.76 (0.67-0.86) tras un ajuste adicional por estilo de vida y otros factores dietéticos. El hallazgo se reprodujo de forma independiente en la cohorte SAPHIR.

The study · 1

Kiechl et al., Higher spermidine intake is linked to lower mortality: a prospective population-based study · Am J Clin Nutr 2018;108(2):371-380

Heart And Vascular

En ratones envejecidos, la espermidina reduce el endurecimiento cardíaco y mejora la función diastólicaPreliminary

In plain terms

En ratones viejos, la espermidina impidió que el corazón se endureciera y le ayudó a relajarse adecuadamente entre latidos. Este es un hallazgo animal, no un efecto demostrado en corazones humanos.

In detail

Eisenberg et al. (2016, Nature Medicine) reportaron que la espermidina oral en ratones envejecidos redujo la hipertrofia ventricular izquierda y la rigidez miocárdica y mejoró la función diastólica, con mejoras paralelas en la función mitocondrial y la autofagia. El artículo también incluyó datos observacionales humanos que vinculaban una mayor espermidina dietética con menor presión arterial y eventos cardiovasculares, lo cual genera hipótesis, no las confirma.

The study · 1

Eisenberg et al., Cardioprotection and lifespan extension by the natural polyamine spermidine · Nat Med 2016;22(12):1428-1438

Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.

How It Works

Anatomy of the Practice

1Inside the cell

Spermidine blocks an enzyme that adds acetyl tags to proteins. That block, plus a few related effects, switches on autophagy, the process a cell uses to break down and recycle its own worn-out proteins and organelles. Fasting and calorie restriction switch on the same process. Spermidine reproduces part of that effect.

2What autophagy clears

Worn-out mitochondria, misfolded proteins and other debris build up inside cells as the body ages. Autophagy clears them. Turning up autophagy is the mechanism behind every laboratory result for spermidine.

3From cell to person

A compound can switch on a good process in a dish and in a mouse and still not change how long or how well a person lives. Human aging is slow and has many causes. That gap is why the mechanism is settled while the human benefit is not.

The supplements tested in people deliver about 1 mg a day. An ordinary mixed diet supplies several times that, so the trials may have added little. You can read more about the autophagy process and the wider science of biological aging in the science library. The food-first case sits on the whole foods page, alongside autophagy itself.

Getting It Right

Ways to Do It

The mortality signal comes from food, and food supplies more spermidine than the trial supplements did.

1

Eat the foods that carry itFreeEasy

Wheat germ is the richest common source. Whole grains, legumes and peas add more, as do mushrooms, aged cheese and fermented foods such as natto. This is the food pattern that tracked with lower mortality in the observational data, and it overlaps almost entirely with a plain whole-food diet worth eating for many other reasons.

2

A spoon of wheat germ$Easy

If you want to raise intake deliberately, a tablespoon or two of plain wheat germ stirred into yogurt, oatmeal or a smoothie is the cheapest concentrated food source there is. It keeps in the fridge once opened and delivers spermidine alongside fiber, B vitamins and vitamin E.

3

A standardized wheat germ extract supplement$ to $$Easy

The supplements studied in people are wheat germ extracts standardized for spermidine, at roughly 1 to 6 mg a day. The one larger trial of such a product found no effect on its primary memory measure. Check for an independent testing mark, since supplements are loosely regulated.

Go Deeper

• Autophagy: what spermidine switches on, why it matters in aging, and what does and does not raise it.
• Biological aging: the wider science of how the body ages, and the levers with human evidence behind them.
• Whole foods: the food-first case; the spermidine-rich grains and legumes here are one part of it.

Cautions For This Practice

Extra restraint

Everything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.

Un ensayo de tres meses encontró que el suplemento de germen de trigo era bien tolerado, con efectos secundarios similares a los del placebo

Schwarz et al. (2018, Aging) evaluaron la seguridad y la tolerabilidad de un suplemento de espermidina de germen de trigo en ratones y en adultos mayores con deterioro cognitivo subjetivo durante tres meses. En el grupo humano, el suplemento fue bien tolerado, los eventos adversos estuvieron equilibrados frente al placebo, y no hubo cambios clínicamente relevantes en las medidas de laboratorio de seguridad. Los ensayos realizados hasta la fecha son cortos y de tamaño modesto, por lo que la seguridad a largo plazo de la suplementación crónica no está establecida.Schwarz et al., Safety and tolerability of spermidine supplementation in mice and older adults with subjective cognitive decline

The longevity claim is animal and observational, so treat anti-aging use as experimental

The lifespan results are in animals. The human mortality link is observational, drawn from food records in people who also ate and lived well. Anyone taking the compound to slow their own aging is running a personal experiment whose effect no human trial has measured. Exercise, sleep and diet have stronger human evidence for aging than any supplement.

The larger memory trial found no effect on its main measure

The SmartAge trial gave 100 older adults a wheat germ spermidine supplement for a year and found no change in memory.

Weigh who ran the trials

Several of the human supplement studies were designed or funded with involvement from a company that sells spermidine products, and some authors hold related patents or equity. That does not make the results wrong, and the studies disclosed it. But it is a reason to read the supplement claims with the source in mind, and to lean on the independent dietary and mechanistic work.

The usual source is wheat germ, which contains gluten

Most spermidine supplements are extracted from wheat germ, and wheat germ contains gluten. If you have celiac disease or a wheat allergy, a wheat germ product is not for you; look for a certified gluten-free source or get spermidine from tolerated foods instead. This is easy to miss because spermidine itself is marketed as a pure compound.

Pregnancy, breastfeeding, active cancer, and children: check first

Supplemental spermidine above food levels has not been studied in pregnancy, breastfeeding or childhood, so food-level intake is the sensible ceiling there. Polyamines including spermidine support cell growth, and levels run high in some tumors, so anyone with an active cancer should raise supplemental use with their oncology team before starting. Food intake as part of a normal diet is a separate matter and is not the concern here.

Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.

Common Questions

Does spermidine actually slow aging or extend life?

Not that any human trial has shown. In animals, spermidine switches on autophagy and extends lifespan, and that mechanism is well characterized. In people, the strongest signal is observational. In a cohort of 829 adults followed twenty years, higher dietary spermidine tracked with lower mortality. That worked out to a hazard ratio near 0.76 per standard deviation of intake, and a gap between the highest and lowest intakes comparable to being 5.7 years younger. It is an association in people who also tend to eat well and take care of themselves, so the healthier diet may explain the lower mortality on its own.

Should I eat spermidine foods or take a supplement?

For most people, eat the foods. The observational link to lower mortality comes from diet, and a normal diet already provides more spermidine than the supplement trials added. Wheat germ carries the most, with legumes, mushrooms, aged cheese and natto behind it. A wheat germ extract supplement delivers the isolated compound.

Does spermidine improve memory?

The only adequately powered trial found no benefit at the dose it used. A small pilot in 30 older adults hinted at a memory benefit earlier. That pilot also provided the short-term safety data, so both signals came from one small group. The SmartAge trial then gave 100 older adults with memory complaints a wheat germ spermidine supplement at 0.9 mg a day for a year. It showed no benefit on the primary memory outcome. Exploratory analyses raised the possibility of effects on verbal memory and inflammation. The authors said those would need a higher dose and a further trial to confirm.

Is spermidine safe to take?

In short trials at these doses it was well tolerated, with side effects no different from placebo. Pregnancy and breastfeeding, active cancer, and the gluten in wheat-germ products are the exceptions covered in the cautions above. For other adults at food levels or the 1-to-6-mg supplement doses studied, spermidine's short-term safety record is reassuring.