Supplement Support
Supplements for Chronic Fatigue
Supplements for persistent fatigue — after ruling out the medical causes that account for most of it.
Persistent fatigue is almost always multifactorial. Before supplement-hunting, rule out: thyroid dysfunction (TSH), iron deficiency (ferritin <50 ng/mL is suspicious even if hemoglobin is normal), vitamin B12 deficiency, vitamin D deficiency, sleep apnea, depression, and medication side effects. If those are clear, the supplements below have evidence in general-population or mitochondrial-dysfunction fatigue. The biggest win is often correcting a deficiency, not adding a novel supplement.
Evidence-rated supplements
Strongest for statin-induced muscle fatigue and mitochondrial-dysfunction profiles. Age-related decline is real — tissue levels drop 50% by 80.
Dose: 100–200 mg/day (ubiquinol preferred 50+), with fat
Full CoQ10 (Ubiquinone/Ubiquinol) profile →Low iron is the most commonly missed cause of fatigue in menstruating women. Bisglycinate form tolerated by most who can't tolerate ferrous sulfate.
Dose: Varies — test serum ferritin first. Target 50+ ng/mL
Full Iron (Bisglycinate) profile →Deficiency is common and correcting it often improves energy. Test first if possible — supplementing above optimal doesn't add benefit.
Dose: 1,000–2,000 IU/day; higher if blood level <30 ng/mL
Full Vitamin D profile →Stress-related mental fatigue and burnout-profile fatigue responds to Rhodiola in RCTs. Not a magic bullet; combined with lifestyle works best.
Dose: 200–600 mg/day of 3% rosavins extract, morning
Full Rhodiola profile →Lifestyle context
Sleep consolidation (same schedule, dark room, no screens 1h before bed) is the highest-leverage intervention. Regular aerobic exercise paradoxically reduces fatigue — even 20 minutes 3×/week produces measurable improvement in fatigue studies. Alcohol reduction is underrated. Caffeine habituation means gradually cutting back often restores responsiveness.
When to see a clinician
Fatigue lasting more than 6 months without improvement, unintentional weight loss, night sweats, new cognitive changes, persistent low mood, or lymphadenopathy warrant medical workup. Myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS) requires specialist care — supplement self-treatment is inappropriate.
Related reading
Next steps
Educational only. This page is not medical advice. Discuss any supplement plan with your clinician — especially if you take prescription medication or have a chronic condition.