Rapamycin (Sirolimus) vs Vitamin D3 (+ K2)
Both are used for live longer. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Rapamycin (Sirolimus) | Vitamin D3 (+ K2) | |
|---|---|---|
| Human evidence | ★★★★★ | ★★★★★ |
| Legal status | Off-Label, FDA Approved | OTC Supplement, Prescription |
| How it works | Binds FKBP12 to inhibit mTOR complex 1 — flipping cells from growth to maintenance (autophagy, stress resistance, less senescence). What mTOR is and why dialling it down matters → the mTOR pathway. The compound-specific nuance is… | Cholecalciferol → 25(OH)D (liver) → 1,25(OH)₂D (kidney), which binds the VDR (vitamin D receptor), a nuclear transcription factor regulating 200+ genes including those for calcium transport, immune peptides, and testosterone synthesis. K2… |
| In plain English | Rapamycin dials the "grow" switch (mTOR) down periodically, flipping cells into "clean and repair." It extends lifespan in every animal tested — the single most reliable longevity drug — but human data is still coming in. Taken weekly, not… | A hormone your skin makes from sunlight that switches on hundreds of genes. Indoor life (very common in Singapore) leaves most people deficient, which quietly lowers testosterone, immunity, and mood. |
| Bottom line | The most compelling longevity drug we have; still needs human RCTs (PEARL, others ongoing). | Highest-value fix if you work indoors. Almost everyone benefits. |
| Availability | Prescription only | Prescription only |
Which is better for live longer?
Both carry a comparable human-evidence rating (★★★★★). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
Full breakdowns: Rapamycin (Sirolimus) · Vitamin D3 (+ K2).
Common questions
Is Rapamycin (Sirolimus) or Vitamin D3 (+ K2) better for live longer?
Both carry a comparable human-evidence rating (★★★★★). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
What's the difference between Rapamycin (Sirolimus) and Vitamin D3 (+ K2)?
Rapamycin (Sirolimus): The most compelling longevity drug we have; still needs human RCTs (PEARL, others ongoing). — Vitamin D3 (+ K2): Highest-value fix if you work indoors. Almost everyone benefits.