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Diminishing returns become apparent after 4 to 6 months for skin-related goals, at which point maintenance frequency (2 to 3 injections per week) replaces loading
New England Journal of Medicine, 384(11), 989-1002
B12 injections may help improve energy by supporting red blood cell production and oxygen transport
While there is no official "human dose" yet because it's still a research chemical, most lab studies use micro-doses to see these effects
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