Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem
It is not a peptide, and there is no injectable form with established safety data oral is the right route
Treating a B12 deficiency may boost energy and mood, reduce stress and fatigue, and decrease symptoms of multiple conditions
Since B12 helps convert food into fuel, correcting a deficiency can reduce fatigue, making it easier to stay active, exercise regularly, and burn more calories
These can, in turn, facilitate the ease of engaging in physical activities, which form part of any weight reduction program
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