I personally have been taking Rejuvant for a month and half. I also started with an aging biomarker test and a spit test analysis. The analysis found that I had genetics that reduced my absorption of Vitamin B. I am now taking Vitamin B supplements along with Rejuvant. I will taking another aging biomarker tests after the six months of Rejuvant. If I was like the average of a previous study, I would expect to see about an eight year reduction in the aging biomarker. Rejuvant has human medical studies where aging biomarkers have been reversed to reduce measured biological age. There is more than the single case as the study looked at hundreds of people. Tom Weldon, the founder and CEO of Ponce de Leon Health, has accomplished longevity escape velocity with one supplement, his own Rejuvant.