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Vitamin B12 injections A Vitamin B12 injection is commonly administered every 7 to 10 days until levels stabilize, and then the patient continues with a maintenance injection less frequently or moves to an oral supplement

This mechanism naturally limits absorption when B12 is consumed in large quantities, with excess amounts typically eliminated through the kidneys without causing harm

grey-market ranges cite single-digit to low-double-digit mg/day not anchored to any human data [3]

Testing goes further than the standard, too, with every lot clearing HPLC, LC-MS identity confirmation, and an endotoxin check before that certificate gets posted, so the COA youre reading isnt just a purity number