pubmed.ncbi.nlm.nih.gov/37111071
ncbi.nlm.nih.gov/pmc/articles/PMC10143675
This study was designed as a randomized, placebo-controlled, triple-blinded, two-armed crossover trial with two 5-day intervention phases separated by a washout phase of 9 days.
In 12 healthy volunteers, 15 mg/d of spermidine was administered orally, and blood and saliva samples were taken.
Results: Compared with a placebo, spermidine supplementation significantly increased spermine levels in the plasma, but it did not affect spermidine or putrescine levels.
No effect on salivary polyamine concentrations was observed.
Conclusions: This study's results suggest that dietary spermidine is presystemically converted into spermine, which then enters systemic circulation.
Presumably, the in vitro and clinical effects of spermidine are at least in part attributable to its metabolite, spermine.
It is rather unlikely that spermidine supplements with doses <15 mg/d exert any short-term effects.