We grade every supplement and device on a simple A/B/C scale:
We update grades as new research is published. Editorial lead: Ulrik Ditlev Eriksen, author of The Art of Longevity.
← HomeA — Consistent human RCT evidence. Multiple randomized controlled trials show the same effect. B — Promising human evidence. Smaller or mixed studies, but a plausible mechanism and net-positive picture. C — Early, mechanistic or observational evidence. Interesting, but not definitively proven.