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Journal of Dermatology and Hair Research , 7(1), 52-61
If necessary, you can also self-inject in your hands, legs, and feet
BAC Water vs Sterile Water vs Saline: Key Differences Explained Sep 19th 2025 Medical injections depend on more than just the active drug itself
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Initial response time also depends on: Severity of the B12 deficiency Frequency of injections Underlying health conditions Absorption and metabolism differences If youre getting your first B12 shot, your provider may start you on a more aggressive schedule, such as weekly injections until your levels are normalized