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It may be that B12 supplementation is only useful for people already deficient in the vitamin, but more research is needed

Athletic Fatigue Athletes and physically active individuals may find that Sulbutiamine helps manage feelings of fatigue

10.3732/ajb.92.1.167 103 KumarG.KarthikL.RaoK

These include hormonal imbalances, nutrient deficiencies, unhealthy dietary habits, lifestyle choices, and environmental exposures
