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Thymosin 4 Affecting the Cytoskeleton Organization of the Myofibroblasts, Ehrlich HP, Hazard SW, Annals of the New York Academy of Sciences, 2012 Oct;1269:7478

Comment B12 below if you want to learn more about how to use B12

Try not to take shots later in the day, since the extra energy might make it harder to fall asleep

Quality and purity of the source formulation matter significantly

it does not actively kill all microbes (that would be bactericidal), but it stops them from reproducing, which is sufficient to maintain sterility in a closed multi-dose vial

Your healthcare provider will determine the best dosing schedule for you