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18 The most bioavailable forms of B12 are methylcobalamin, hydroxocobalamin, and adenosylcobalamin
This decline correlates with the reduced regenerative capacity that comes with aging, which partly explains why shoulder injuries heal more slowly in older individuals
Most users report subtle energy improvements within the first week
That study used intraperitoneal dosing in mice and rats and cannot be directly translated to subcutaneous dosing in human adolescents
People on a strict vegetarian or vegan diet or those with certain medical conditions may lack B12
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