b12 injections versus oral supplements Efficacy of compared with intramuscular vitamin B-12 supplementation after Roux-en-Y gastric bypass: a randomized controlled trial The B-12 Store - Online
Description
Dose Selection: The trials evaluated doses ranging from 0.25 mg to 54 mg, with higher doses showing increased gastrointestinal effects
NHS loading is 1mg hydroxocobalamin every two days for two weeks, then maintenance every two to three months for life when the cause is non-dietary

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the B-Complex Injection can help mitigate drug-induced B deficiency, but the clinician should be mindful to coordinate its use so that adequate B is maintained without causing excessive levels
