Vitamin B12 / B Complex
for Fatigue
B12 and other B vitamins are essential for energy metabolism. Deficiency — common in vegans, vegetarians, older adults, and those on metformin — causes fatigue, weakness, and cognitive impairment.
How it works
B12 is required for myelin synthesis and red blood cell production. B vitamins are cofactors in the citric acid cycle. Deficiency directly impairs ATP production and oxygen-carrying capacity.
What to watch for
Test B12 levels before high-dose supplementation. Methylcobalamin or hydroxocobalamin forms are better absorbed. Serum B12 can appear normal even with functional deficiency — methylmalonic acid is a better marker.
Community experience
Other remedies for Fatigue
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