How it may work
A naturally occurring polyamine involved in pathways including autophagy. Mechanistic plausibility does not show that a supplement extends life or improves validated healthspan.
Lifespan / validated healthspanEvidence level E
Level E marks a central question without dependable direct human evidence; read the outcome conclusion rather than treating the letter as a direction of effect.
This E grade answers the central longevity question only. Other outcomes are graded separately below.Why people are interested
A natural polyamine involved in cellular-maintenance pathways. Dietary associations are interesting, but the largest cognition trial was null and no completed supplement trial shows longer lifespan or validated healthspan.
Outcome map
One ingredient. Different questions.
Evidence can be stronger for a specific marker or population and weaker for a broader promise. Each row answers a separate question.
- 01Evidence level E
Human lifespan or validated healthspan
No completed human intervention reviewed demonstrated longer lifespan or an improvement in validated healthspan.
- 02Evidence level C
Cognitive performance in older adults
A small imprecise pilot, a null largest 12-month trial and weaker active-control or uncontrolled designs leave the human landscape mixed.
- 03Evidence level E
SmartAge primary memory endpoint
The prespecified primary result was null, so this exact regimen did not establish a positive memory effect.
- 04Evidence level C
Dietary mortality association
Prospective cohorts associate higher estimated dietary intake with lower mortality, but association does not establish supplement efficacy or causation.
- 05Evidence level B
Radiotherapy-associated xerostomia
One small trial reported less xerostomia at three months in this exact clinical context; it does not establish a general dry-mouth or longevity benefit.
- 06Evidence level E
Long-term and complex-population safety
The reviewed short, selected studies do not establish long-term safety in the general population, pregnancy, cancer or complex polypharmacy.
Library trackResearch Radar
Last reviewed22 Aug 2026
Guide scopeIngredient research only
What people have studied
Human evidence is heterogeneous and source-specific. Prospective cohorts associate higher dietary intake with lower mortality, but no completed intervention shows longer lifespan or healthspan. The largest 12-month cognition trial was null, a vaccine pilot produced only an exploratory selected-subgroup signal, and one small radiotherapy trial reported less xerostomia at three months.
What to consider
Selected short trials did not report a major treatment-related pattern under their exact conditions. They cannot establish broad or long-term safety, and wheat-germ extract, baked food, algae/soy, purified salt, diet and multi-ingredient preparations are not interchangeable.
Local pathway
This science review does not establish a Thailand market route. Ingredient source, formulation and finished-product status require separate official confirmation.
Sources + indexes
See where the explanation comes from.
Open the linked research and official records behind this guide. Early topics may begin with a research index while stronger sources are added.