Nicotinamide Mononucleotide, an unregulated supplement.
Note also:
> We found that, when data from all organisms studied were combined for each compound, aspirin resulted in the highest percent increase in average lifespan (52.01%), followed by minocycline (27.30%), N-acetyl cysteine (17.93%), nordihydroguaiaretic acid (17.65%) and rapamycin (15.66%), in average.[0]
Though I'd consider whether flies and worms are good models for your human self.