Ranked by evidence

Best supplements for energy and fatigue

Fatigue almost always has a cause — poor sleep, low iron, illness, simply doing too much — and no supplement replaces finding it. The list below is ranked by how strong the evidence is for this specific goal, not by how well the product sells. A few things genuinely help; several bestsellers do not.

Evidence last reviewed: August 2026

Top picks

Option	Evidence	Best for	The honest note
Caffeine	Strong evidence	fast, reliable alertness	The only clear stimulant here: strong evidence for increased alertness and focus, plus improved aerobic and strength performance.	View
Iron	Strong evidence	fatigue with low iron stores	Large benefit only if you are actually deficient: reduces fatigue in non-anaemic women with low ferritin. Confirm ferritin first, and dosing matters.	View

Solid options

Option	Evidence	Best for	The honest note
Panax Ginseng	Moderate evidence	everyday subjective tiredness	Modest but reasonably consistent reduction in subjective fatigue. It does not improve physical performance, and the cognitive claims do not hold up.	View
L-Theanine	Moderate evidence	smoother focus alongside caffeine	Best used with caffeine, where the combination improves attention. On its own the effect is a small reduction in acute stress, not an energy boost.	View

Situational

Option	Evidence	Best for	The honest note
Vitamin B12	Strong evidence	vegans, older adults, absorption issues	Clearly effective, often necessary, for vegans, older adults and people with absorption problems. In people with normal levels the energy claim is limited.	View
L-Tyrosine	Moderate evidence	thinking clearly after a bad night	Protects working memory and mental flexibility under acute stress like sleep loss, cold or noise. In rested people it does essentially nothing.	View
Melatonin	Moderate evidence	jet lag and shifted sleep schedules	Useful when the tiredness comes from a shifted body clock: helps you fall asleep faster and eases jet lag. The effect is real but modest.	View
Beetroot (Dietary Nitrate)	Moderate evidence	endurance in recreational athletes	Small but real gains in endurance and repeated high-intensity work, mostly in recreational athletes; the effect shrinks toward zero in elite athletes.	View
Urolithin A	Moderate evidence	muscle endurance after middle age	Modest gains in muscle endurance in middle-aged and older adults, with real mitochondrial biomarker changes. No benefit shown in trained athletes.	View

Popular for this goal — but the evidence says skip

B-Complex Limited evidence
It corrects a B-vitamin deficiency and lowers homocysteine, but the evidence that it gives you energy if you already eat enough is limited.
Rhodiola Rosea Limited evidence
The fatigue trials are small and mostly at high risk of bias, and the one rigorous depression trial was no better than placebo.
Nicotinamide Riboside Limited evidence
It reliably raises NAD+ and then consistently fails to improve muscle, metabolic or physical-function outcomes in controlled trials.
D-Ribose Limited evidence
Plausible mechanism, but controlled trials in trained people find no benefit and the fatigue data are open-label and uncontrolled.
Adrenal Support Formulas Limited evidence
Adrenal fatigue is not a recognized condition, and testing found these products contained undeclared thyroid hormone.
Magnesium Malate Limited evidence
A perfectly fine magnesium salt sold on a Krebs-cycle energy story that no blinded trial has actually supported.

Our verdict

Caffeine is the only thing that reliably makes you feel more alert today, and iron is the one that can fix the underlying problem — but only if your ferritin is genuinely low. Everything else is smaller, slower, or limited to one particular situation.