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While they can be effective for mild deficiencies or maintenance once adequate levels are reached, they are generally not as effective as injections for treating severe deficiencies
How long the injection lasts depends on several factors: How severe the deficiency is A persons age and how fast their body processes things Problems with digestion or absorbing nutrients Daily habits or activity levels How often does the body use B12 inside its cells People with pernicious anemia or ongoing deficiency often get weekly shots, while others do fine with a monthly injection
Its selectivity is just as important
For research series with multiple withdrawals from the same vial, this is the practical standard
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