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.
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.
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Creatine Monohydrate
Tier APhosphocreatine (PCr) / ATP Buffering — Tier A.
3–5g/day monohydrate (optional 20g/day loading, 5–7 days)·AM/PM·3 PMIDs - 2
R-Alpha Lipoic Acid
Tier BRedox Cycling — Tier B.
300–600mg R-ALA·AM/PM·1 PMID - 3
NMN
Tier ANAD+ Restoration — Tier A.
250–500mg NMN·AM·3 PMIDs - 4
Ca-AKG
Tier ATCA Cycle Support — Tier A.
1–2g Ca-AKG·AM·2 PMIDs - 5
Taurine
Tier BOsmolyte / Mitochondrial Buffer — Tier B.
1–3g taurine daily·AM/PM·1 PMID - 6
CoQ10 (Ubiquinol)
Tier BMitochondrial Electron Transport Chain — Tier B.
100–300mg ubiquinol daily (300mg if on statins)·AM/PM·3 PMIDs - 7
GlyNAC
Tier AGlutathione Synthesis — Tier A.
600mg glycine + 600mg NAC·AM·2 PMIDs - 8
PQQ (Pyrroloquinoline Quinone)
Tier CCREB/PGC-1α Mitochondrial Biogenesis — Tier C.
20mg/day (PQQ disodium salt, e.g. BioPQQ)·AM·3 PMIDs
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.