Comparison
Melatonin vs Metformin
Melatonin
Pineal hormone regulating circadian rhythm. Low doses (0.3-1mg) often outperform higher doses for sleep.
Metformin
Anti-diabetic medication studied for longevity. AMPK activator. Glucose normalization.
| Field | Melatonin | Metformin |
|---|---|---|
| Category | neuroprotective | neuroprotective |
| Dose range | 0.3–3mg | 500–2000mg |
| Half-life | 1h | — |
| Onset | 30min | — |
| Evidence | EVIDENCEA | EVIDENCEA |
| Safety | ●●●●● | ●●●●○ |
| Legal (US) | USOTC | USRx |
| PubMed refs | 28000 | 23000 |
The comparison in plain English
Auto-generated from dataMelatonin and Metformin are both in the neuroprotective category respectively. Melatonin Pineal hormone regulating circadian rhythm. Metformin Anti-diabetic medication studied for longevity.
Bottom line
Melatonin (evidence A, safety 5/5) matches the evidence base of Metformin (evidence A, safety 4/5). Melatonin has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Melatonin if
Melatonin is the better fit when your goal aligns with its mechanism (Endogenous hormone produced by the pineal gland in response to darkness, signalling the circadian sleep window) and the dose range (0.3–3mg) suits your protocol. Half-life is 1h.
Choose Metformin if
Metformin is the better fit when your goal aligns with its mechanism (Activates AMP-activated protein kinase (AMPK), the cellular energy sensor that mimics caloric restriction signalling) and the dose range (500–2000mg) suits your protocol. Half-life is —h.