Stress-related fatigue arises from biological pathways (inflammation, neuroendocrine changes, nutrient depletion) and social factors (long work hours, caregiving). Evidence supports several nutritional supplements as helpful in reducing this type of fatigue, particularly when deficiency or increased physiological demand is present.
Evidence-backed supplements
Broad-spectrum B vitamins have clinical trial support for improving energy and mood in stressed individuals. Julia Rucklidge University of Canterbury has conducted randomized trials showing high-dose micronutrient formulas that include B vitamins can reduce symptoms of fatigue, anxiety, and poor concentration. Systematic reviews led by Jerome Sarris NICM Health Research Institute Western Sydney University indicate that B-complex supplements may benefit mood and stress-related symptoms, though effects vary by formulation and population.
Omega-3 fatty acids show consistent signals for reducing stress-related mood disturbance and may indirectly reduce fatigue by lowering inflammation. Philip C. Calder University of Southampton has reviewed biological mechanisms linking eicosapentaenoic acid and docosahexaenoic acid to brain function and stress resilience, and meta-analyses report modest benefits for depressive and stress-related symptoms.
Vitamin D deficiency is commonly associated with low energy and fatigue, and repletion can improve well-being in deficient people. Michael F. Holick Boston University has documented associations between low 25-hydroxyvitamin D levels and fatigue and recommends correcting deficiency as one component of managing low energy.
Herbal adaptogens such as Rhodiola rosea have moderate-quality trials showing reductions in fatigue and improved mental performance under stress. Edzard Ernst University of Exeter reviewed complementary therapies and noted Rhodiola as one of the better-supported botanicals for fatigue, while cautioning about variability between products.
How they work, relevance, and precautions
These interventions act via different pathways: B vitamins support neurotransmitter synthesis and cellular energy, omega-3s modulate inflammation and membrane function, vitamin D influences immune and neuroendocrine systems, and adaptogens may normalize stress-response signaling. Relevance is context-dependent: regions with low sunlight have higher vitamin D deficiency, and populations with limited dietary variety may benefit more from B-vitamin or omega-3 supplementation. Consequences of indiscriminate use include nutrient interactions, masking of medical conditions, and variable product quality; professional assessment of deficiencies and potential drug interactions is recommended. For individuals experiencing chronic fatigue, combining medical evaluation, dietary strategies, and targeted supplementation under clinical guidance offers the best evidence-based approach.