Supplements for energy / fatigue

Compared by effect and evidence certainty. Cost is not currently assessed, and nothing here is sold to you.

Irongrade Ahigh certainty— reliably reduces fatigue when iron deficiency / IDA is present; no benefit when iron-replete

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: no major structured gap flagged; review the claim limitations.

CoQ10grade Ahigh certainty— Meta-analysis of 13 RCTs (n=1,126) found CoQ10 supplementation significantly reduced fatigue scores versus placebo (Hedges' g = -0.398, 95% CI: -0.641 to -0.155, p = 0.001). Benefits were consistent in healthy and diseased participants, and greater reductions were associated with higher daily doses and longer durations. The effect was significant for CoQ10-only formulations but not CoQ10 compounds.

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: no major structured gap flagged; review the claim limitations.

Caffeinegrade Bmoderate certainty— reduces perceived fatigue; tolerance develops with regular use

Safety: minor — Commonly paired; L-theanine is said to smooth caffeine’s jitter. Low-stakes.. Cost: not assessed. Evidence gaps: population bounds not reported.

Ashwagandhagrade Bmoderate certainty— Ashwagandha supplementation was more efficacious than placebo for improving fatigue/recovery variables in healthy individuals.

Safety: moderate — Ashwagandha with an SSRI may carry additive sedative/serotonergic risk; evidence is limited.. Cost: not assessed. Evidence gaps: studied dose not reported.

Rhodiolagrade Clow certainty— small reductions in fatigue in stressed adults; studies are short and small

Safety: uncertain — Rhodiola may have mild serotonergic activity; evidence with SSRIs is thin — treat as cautionary.. Cost: not assessed. Evidence gaps: studied dose not reported; population bounds not reported; certainty or evidence strength remains limited.

CoQ10grade Clow certainty— limited evidence for general fatigue; clearer in specific conditions (e.g., statin myalgia, mitochondrial disorders)

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: certainty or evidence strength remains limited.

Creatinegrade Clow certainty— may reduce mental fatigue, especially under sleep deprivation or stress

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: certainty or evidence strength remains limited.

Vitamin B12grade Clow certainty— corrects fatigue when B12 deficiency is present; no energy benefit in replete people

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: certainty or evidence strength remains limited.

Irongrade Dvery-low certainty— 21-study review: iron supplementation associated with improved fatigue scores (p-values only, no CI/n given) in non-anemic iron deficiency; the review's own meta-analyses were "limited" for most outcomes examined.

Safety: no modeled interaction found; coverage unknown, not proven safe. Cost: not assessed. Evidence gaps: certainty or evidence strength remains limited.