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what happens if vitamin b12 injection goes in vein Injections B12 Shots vs. IV Infusions:
Description
Depending on the specific type of synthetic vitamin B12 used and local medical guidelines, these maintenance injections are typically given once a month or once every 2 to 3 months [6] [2]
It also induces the expression of suppressor of cytokine signaling-3, which is a negative regulator of leptin signaling [13]

Revised 08/2019
An injection delivers B-12 directly into muscle tissue, allowing for faster and more reliable uptake.

PMC Stier H, Vos E, Kenley D

Keep hydrating and move your arm to reduce stiffness