The Longevity Hierarchy That Actually Matters
The practical version, before the mechanisms
1 min read·Updated July 2026
If you want the practical version before the underlying science, this is it. Everything here is explained and cited properly in the sections that follow.
| Tier | What's in it | Evidence strength |
|---|---|---|
| Tier 1 — Do this | VO2 max training, resistance training, blood pressure control, not smoking, consistent sleep, healthy body composition | Strong — large cohort and trial evidence, covered in depth in the Exercise, Heart & Metabolic Health, and Sleep guides |
| Tier 2 — Reasonable, well-studied | Caloric restriction principles, time-restricted eating, a Mediterranean-style diet | Moderate-strong — genuine human trial data, covered in Sections 5–6 |
| Tier 3 — Emerging, incomplete evidence | NAD+ precursors (NMN/NR), metformin, rapamycin | Mechanistically plausible, backed by animal or observational data; human longevity outcomes remain unproven |
| Tier 4 — Proceed with real caution | Unregulated peptides (BPC-157, TB-500) and similar compounds | Little to no robust human trial data; physician guidance essential if used at all |
The bottom line
No supplement or intervention compensates for smoking, chronic sleep deprivation, sedentary behaviour, obesity, or chronic unmanaged stress. Get Tier 1 right first — the exotic interventions in Tiers 3 and 4 sit at the margin, not a substitute for the fundamentals.