Chronic fatigue encompasses two clinical conditions that pharmacy professionals must be able to distinguish. Functional asthenia (the most common) is linked to an identifiable nutritional deficiency (iron, magnesium, vitamin D3, B vitamins), chronic stress, or overwork—it responds well to targeted supplementation and adaptogens. Chronic fatigue syndrome (CFS/ME, myalgic encephalomyelitis, WHO G93.3) is a more severe neuroimmune disorder diagnosed when fatigue persists for ≥ 6 months, accompanied by post-exertional malaise, cognitive impairments, non-restorative sleep, and at least one criterion for autonomic dysfunction, after ruling out all other medical causes. CFS requires specialized medical care—supplements can improve quality of life but do not treat the underlying condition.
Mitochondrial dysfunction is one of the best-documented mechanisms in chronic fatigue. Magnesium (300–400 mg/day, in citrate or bisglycinate form) is a cofactor in more than 300 enzymatic reactions involved in ATP production—its deficiency, which is common in situations of chronic stress, is one of the most common causes of functional asthenia. CoQ10 (ubiquinol, 100–300 mg/day) is essential for the mitochondrial electron transport chain—its concentration is significantly reduced in CFS, and randomized trials (Campagnolo et al., 2017) confirm an improvement in fatigue and muscle pain with 200–300 mg/day of ubiquinol.
Alpha-lipoic acid (R-form ALA, 300–600 mg/day) simultaneously replenishes vitamin C, vitamin E, and intracellular reduced glutathione—a mechanism relevant to chronic fatigue, where oxidative stress gradually erodes antioxidant defenses. Vitamin B12 (methylcobalamin, 1,000 µg/day sublingually) corrects the hypomethylation documented in CFS—which manifests as cognitive fatigue, peripheral neuropathy, and myelination disorders. Oligobiane Iron Copper (Pileje) provides supplemental iron (for hypochromic anemia) and copper (for mitochondrial protein degradation), deficiencies of which also cause severe asthenia.
Stabilium 200 (Yalacta, hydrolyzed cod garum, GABA-like bioactive peptides + taurine + DHA) modulates the HHS axis—an ISHEM clinical study (1986) confirms a reduction in morning cortisol levels and improved stress resistance in asthenic subjects after 3 weeks. Rhodiola (Rhodiola rosea, salidrosides + rosavins ≥ 3%) inhibits COMT (catechol-O-methyltransferase), preserving the levels of norepinephrine and dopamine mobilized by chronic stress. A meta-analysis (Hung et al., 2011) confirms an improvement in mental fatigue and exercise capacity with 200–600 mg/day.
A three-level, graduated protocol structures the approach to functional asthenia. Level 1—assessment and correction of deficiencies (8 weeks): complete blood count (CBC), ferritin, vitamins D3 and B12, erythrocyte magnesium, TSH. Level 2 — mitochondrial support (3 months): magnesium bisglycinate + CoQ10 ubiquinol + R-form ALA + B-complex. Level 3 — adaptogens and stress management (3–6 months): Rhodiola + Stabilium 200 + melatonin if sleep is disrupted. Ifasthenia persists despite this protocol, a specialized medical consultation is essential to rule out CFS/ME, hypothyroidism, or an autoimmune disease.
The initial lab workup for unexplained chronic fatigue should always include: complete blood count (CBC; to check for anemia and leukopenia), ferritin (subclinical deficiencies are common at levels below 30 µg/L), vitamins D3 (nearly universal deficiency in winter) and B12 (common deficiency in vegetarians and the elderly), erythrocyte magnesium (more reliable than serum magnesium), TSH (hypothyroidism is often masked), fasting blood glucose (early-stage type 2 diabetes), and liver function tests. A comprehensive thyroid workup (free T4, anti-TPO antibodies) is indicated if fatigue is accompanied by sensitivity to cold, weight gain, or bradycardia. Once identified and corrected, these deficiencies can resolve 60 to 70% of cases of chronic functional fatigue without any further therapeutic intervention.
