Dosage guide
Spermidine dosage
Spermidine dosing: typical range, frequency, half-life, onset, routes. Evidence-tiered.
At a glance
- Typical dose
- 1.2mg
- Half-life
- 6hr
- Frequency
- daily, typically morning with food
- Routes
- oral
Protocol
- 1
Measure the dose
Typical Spermidine dose is 1.2 mg. Use a weight-based calculator for individual adjustments.
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Set the frequency
Administer daily, typically morning with food. Half-life of 6 hours anchors the dosing interval.
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Monitor for side effects
Watch for: mild GI upset (rare); headache (rare). Stop or reduce dose if tolerability breaks down.
Why this dose
Induces macroautophagy via inhibition of EP300 histone acetyltransferase and activation of TFEB-mediated lysosomal biogenesis. Substrate for hypusination of eIF5A, required for translation of mitochondrial respiration proteins.
The typical 1.2 mg dose is the figure most commonly used in published protocols for Spermidine. Treat the label as a starting point: body weight, training status, sleep, diet, and concurrent medications all shift the effective dose-response curve in real users.
How to administer
Spermidine is administered via the oral route. Oral dosing is straightforward: take with water, with or without food unless specifically noted.
Onset of action runs around 2 hours after administration. Peak effect lands near 4 hours post-dose. Plan the administration window so that peak effect lines up with whatever outcome you are dosing for, whether that is training, sleep, or symptom coverage.
Half-life note: Plasma kinetics complex; intestinal polyamine oxidases partially metabolize oral dose; tissue half-life longer than plasma
Cycling and tolerance
No formal cycling; continuous use mirrors dietary exposure pattern
Effects to expect at typical dose
- Endogenous polyamine that induces autophagy via EP300 acetyltransferase inhibition and TFEB activation
- Concentrated in wheat germ, soybeans, aged cheese, and mushrooms; ~10 to 15 mg/day in Mediterranean diets
- Eisenberg 2016 reported dietary spermidine extended mouse lifespan and improved cardiac function
- Wirth 2018 pilot (n=28) reported cognitive signal at 0.9 mg/day in older adults at risk for dementia
- Larger Wirth 2019 follow-up (n=85) did not replicate the memory benefit at 12 months
- Generally regarded as safe at supplemental doses; food-source position is reassuring
Best-graded outcomes
- A Autophagy induction (mechanistic) : Well-mapped via EP300 and TFEB (Yeast, flies, worms, mice, cells).
- B Lifespan extension in mice : 5 to 15% lifespan extension (Mouse studies, dietary spermidine).
- B Cardiac function in aging models : Improved diastolic function (Eisenberg 2016) (Mouse aging hearts).
Side effects and interactions
Common side effects
- mild GI upset (rare)
- headache (rare)
Notable interactions
- DFMO (difluoromethylornithine) (moderate): competing polyamine metabolism; do not combine without oncology guidance
Lists above cover commonly reported and well-characterized items. They are not exhaustive: review the full Spermidine profile and discuss with a clinician familiar with your medication list before starting, particularly if you are on prescription therapy or have a chronic condition.
Regulatory snapshot
- WADA status
- allowed
- DEA / Rx
- OTC supplement (not scheduled)
- Pregnancy
- Insufficient data; not routinely recommended at supplemental doses
- Legal status
- OTC dietary supplement (wheat-germ extract has GRAS status in US)
Do not use if
- wheat-germ allergy or celiac disease (for wheat-germ-extract products)
- active cancer (theoretical)
- pregnancy and lactation (insufficient data)
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