Is COMT useful for fatigue?

The COMT gene (especially the Val158Met variant, rs4680) is often discussed in relation to fatigue and energy regulation. COMT breaks down catecholamines like dopamine and adrenaline. The Met variant results in slower enzyme activity, potentially leading to higher dopamine levels, which might influence mental stamina and stress resilience. However, the evidence linking COMT directly to fatigue is weak. Effect sizes are small, and fatigue is highly multifactorial (sleep, nutrition, stress, thyroid, iron status). No robust clinical study supports using COMT genotyping alone to diagnose or treat fatigue. Consumer DNA tests can provide a suggestive piece of the puzzle, but they are not diagnostic. Anyone experiencing persistent fatigue should pursue standard medical workup (CBC, vitamin D, B12, ferritin, thyroid panel). COMT information may be integrated into a broader lifestyle and nutrigenetic approach, but it is not a standalone tool for fatigue management.