B12 shots contain synthetic B12 that is injected into a muscle
Its origin story is unusual and worth understanding, because the circumstances of its discovery shaped and arguably oversold everything that followed
Individual results vary based on starting body composition, dose, diet, activity level, and genetic factors, but general patterns emerge across most users
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While these are population-level numbers, the principle applies to individuals as well: routine injection visits for non-deficient patients add up in copays, travel time, and appointment scheduling without delivering additional benefit
[9] Visual disturbances have been reported in patients with Leber hereditary optic neuropathy, and rapid B12 administration may precipitate optic nerve atrophy in this genetically predisposed population, mandating extreme caution or alternative therapy