Spermidine

Spermidine's primary mechanism is direct activation of cellular autophagy through inhibition of the histone acetyltransferase EP300 (also called p300/CBP). EP300 normally acetylates autophagy-related proteins to keep autophagy suppressed; spermidine binding to EP300 reduces this inhibition, derepressing autophagy gene expression via TFEB (transcription factor EB), the master regulator of lysosomal biogenesis and autophagy. The autophagy induction is dose-dependent, conserved across yeast, worms, flies, mice, and humans, and is the proposed mechanism for spermidine's lifespan extension in model organisms.,Beyond autophagy, spermidine modulates histone H3 acetylation patterns, leading to broad transcriptional changes in genes regulating cellular stress resistance, metabolism, and longevity. Spermidine also supports mitochondrial respiration efficiency, increases mitophagy (selective clearance of damaged mitochondria), and stabilizes RNA structure through polyamine-RNA interactions. In immune cells, spermidine promotes a shift toward anti-inflammatory phenotypes and supports T-cell function with age.,Cardiovascular effects involve restoration of titin elasticity in cardiomyocytes (improving diastolic function), reduction of cardiac hypertrophy, improvement of endothelial function via increased nitric oxide signaling, and reduction of arterial stiffness. In the brain, spermidine crosses the blood-brain barrier (limited but present) and supports memory consolidation, synaptic plasticity, and clearance of protein aggregates implicated in Alzheimer's and Parkinson's disease.

Spermidine's primary mechanism is direct activation of cellular autophagy through inhibition of the histone acetyltransferase EP300 (also called p300/CBP). EP300 normally acetylates autophagy-related proteins to keep autophagy suppressed; spermidine binding to EP300 reduces this inhibition, derepressing autophagy gene expression via TFEB (transcription factor EB), the master regulator of lysosomal biogenesis and autophagy. The autophagy induction is dose-dependent, conserved across yeast, worms, flies, mice, and humans, and is the proposed mechanism for spermidine's lifespan extension in model organisms.,Beyond autophagy, spermidine modulates histone H3 acetylation patterns, leading to broad transcriptional changes in genes regulating cellular stress resistance, metabolism, and longevity. Spermidine also supports mitochondrial respiration efficiency, increases mitophagy (selective clearance of damaged mitochondria), and stabilizes RNA structure through polyamine-RNA interactions. In immune cells, spermidine promotes a shift toward anti-inflammatory phenotypes and supports T-cell function with age.,Cardiovascular effects involve restoration of titin elasticity in cardiomyocytes (improving diastolic function), reduction of cardiac hypertrophy, improvement of endothelial function via increased nitric oxide signaling, and reduction of arterial stiffness. In the brain, spermidine crosses the blood-brain barrier (limited but present) and supports memory consolidation, synaptic plasticity, and clearance of protein aggregates implicated in Alzheimer's and Parkinson's disease.

What's safe to combine, and what belongs in a separate pin.

Storage. Store at room temperature (20-25C) in a cool, dry place. Wheat germ extract capsules are shelf-stable for 18-24 months. Synthetic spermidine trihydrochloride is stable for 2+ years. Protect from moisture and light.

Classified as a dietary supplement in the US (not FDA-approved for any medical condition). Available over the counter. Generally Recognized as Safe (GRAS) status not formally established for synthetic spermidine; wheat germ extract has long history of dietary use. EU has authorized spermidine-rich wheat germ extract as a novel food ingredient.