can b12 injections cause black stools B1 (Thiamine), B6 (Pyridoxine), and (Cobalamin) supplements dark stools? Why iron supplements turn stool
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Side Effect of Pepto-Bismol: One medication notorious for turning stool black is Pepto-Bismol

Chen S, Yang X, Jiang Y, et al

HUBERMAN: And the reason why a lot of people seek to take Sermorelin is because they like the effects it produces

Store B12 injections in a cool, dry place, typically below 77F (25C) and avoid leaving them in hot environments, such as inside a car, near a stove, or in direct sunlight for extended periods