Best Supplements for Energy & Fatigue
Persistent fatigue is often a mitochondrial and nutrient-sensing story: declining NAD+, less efficient electron transport, and a stalled TCA cycle. These compounds act on those mechanisms and are ranked by the strength of the human evidence behind them — not by how good they sound.
The top pick
The top-ranked pick here is Creatine Monohydrate Tier A — Phosphocreatine (PCr) / ATP Buffering. Next best-evidenced: R-Alpha Lipoic Acid and NMN.
Ranked by strength of human evidence (Tier A > B > C) and mechanistic fit — computed from the compound registry, not hand-picked. Every entry links to its full evidence deep-dive with PubMed citations. Educational only, not medical advice.
- Creatine MonohydrateTier A
Phosphocreatine (PCr) / ATP Buffering
3–5g/day monohydrate (optional 20g/day loading, 5–7 days)AM/PM3 PMIDs - CoQ10 (Ubiquinol)Tier B
Mitochondrial Electron Transport Chain
100–300mg ubiquinol daily (300mg if on statins)AM/PM3 PMIDs The 2024 NAD+ story — elevated in centenarians, restores muscle mitochondrial function in aged models
100–300 mg/dayAM1 PMID
The aging mechanisms behind this goal
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What is the best-evidenced supplement for energy?
NMN has the strongest human trial footprint for restoring NAD+, the coenzyme mitochondria depend on — but energy is multi-causal, so rule out iron, thyroid, B12, and sleep debt with your physician first. TNiC grades every compound A/B/C by the strength of human evidence.
Do energy supplements work if I sleep badly?
Fix sleep first — no compound outperforms adequate sleep for daytime energy. Magnesium, glycine, and melatonin address sleep quality directly; energy compounds like NMN and CoQ10 work on the mitochondrial layer once the sleep foundation is in place.