Half the viral T-maxxing stack was only ever tested on rats
T-maxxing, the push to raise testosterone, has made one stack famous: tongkat ali, a Malaysian root, plus fadogia agrestis, an African shrub.
Fadogia has never been tested in people. PubMed, Europe PMC and ClinicalTrials.gov hold no human study of it, only rat studies, plant chemistry and folk use. In rats it raised testosterone, and after 28 days the researchers reported adverse effects on testicular function.
Tongkat ali is the half with human evidence: a 2022 meta-analysis of five placebo-controlled trials found higher total testosterone, clearest in men whose levels were low. The trials used two extracts, LJ100 and Physta. Our ranking of nine tongkat ali supplements shows which bottles carry them:
https://super-achiever.com/best/tongkat-ali-supplements
Sources: Yakubu MT et al., J Ethnopharmacol 2008, PMID 18023305. Leisegang K et al., Medicina 2022, PMID 36013514.
The short version, as a video:
We put the full breakdown — every study, every number, with the PMIDs — on our own site.
Originally published at super-achiever.com. We check viral supplement claims against the primary research and publish the results — including the ones that go against us.