longevity
3 interactions related to longevity
spermidine + resveratrol
Spermidine and resveratrol both promote autophagy but reach it through different upstream routes: spermidine inhibits acetyltransferases while resveratrol activates the deacetylase SIRT1, converging on the cell's acetylproteome. In human cells, yeast, and nematodes, low concentrations that did nothing alone induced autophagy when combined, so the two are biologically plausible partners. Human clinical evidence for the combination is lacking, so any longevity stack should be treated as a low-stakes complement to diet, sleep, and exercise rather than a proven intervention.
nad+ + niacin
Niacin (nicotinic acid) is a vitamin B3 form the body converts to NAD+ through the Preiss-Handler pathway, so pairing low, vitamin-level niacin with a direct NAD+ precursor gives cells more than one biosynthetic route to build their NAD+ pool. Niacin has been shown to raise muscle and blood NAD+ in mitochondrial myopathy, though no human trial has tested combining it with direct NAD+, NR, or NMN — the synergy is plausible additive biology rather than a proven stack.
fisetin + quercetin
Fisetin and quercetin are structurally related dietary flavonols with overlapping antioxidant and anti-inflammatory activity, both studied as candidate senolytics. They are often combined in longevity-oriented supplement stacks, but the robust human senolytic evidence is for dasatinib plus quercetin, not for the fisetin-plus-quercetin pairing, which rests largely on animal and mechanistic data. The combination is generally well tolerated; the main practical consideration is that both flavonoids can affect platelet function and drug metabolism, so anyone on prescription medication should check with a clinician.