b12 injection constipation Hydroxocobalamin Injection: Vitamin for Energy & Anemia — Mountainside Medical Methylcobalamin Injection (Vitamin B12) |

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Learn more about what B12 injections are used for and the possible side-effects of this injection

Because the intranasal forms have lower absorption than the IM dosage form, intranasal B12 forms are administered once weekly

The primary difference is that the vials are only available in 2.5 mg and 5 mg doses, while the pens include those doses as well as 7.5 mg, 10 mg, 12.5 mg, and 15 mg. In clinical trials, patients on the 5 mg dose (maximum dose in single-dose vials) lost an average of 15% of their body weight in a year, while those on the 15 mg dose (maximum dose in single-dose pens) lost an average of 20% in a year