can i give myself vitamin b12 injections Instruction Guide for Intramuscular (IM) Self-injection of Methylcobalamin 1mg/5mg B12 Injections in the comfort
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M., & Grinspoon, S

Always follow your providers guidance on this
Women taking oral contraceptives may have decreased serum B 12 levels in the absence of clinical deficiency (due to decreases in the B 12 carrier protein, haptocorrin)

Knowing this can help you schedule your treatments better and stay on track
On rare occasions some patients do find that B12 improves their sleep if you fall into this category then using B12 at night may be better for you