b12 injection how long before it works Quickly Does a Work? Timeline and Expectations – Bolt Pharmacy B12 Injections for Weight Loss:

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A clinical study estimated that 85% of patients come up short of the necessary vitamin B12 from their meals

A published case series on cobalamin disorders described subcutaneous B12 as a gentle, easy-to-use alternative to intramuscular injections

Treatment doses depend on the cause: pernicious anaemia typically requires intramuscular hydroxocobalamin 1,000 micrograms three times weekly initially, whilst dietary deficiency may be treated with oral cyanocobalamin 50150 micrograms or 1,000 micrograms daily