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Outer thigh (vastus lateralis) Great for self-injecting because its easy to reach and safe
Cell Host Microbe 26 (2), 265-272.e4
However, more receptors do not automatically mean better outcomes
Vitamin B12 shots may not be suitable for people with a history of: sensitivity to vitamin B12 Lebers disease, which affects the optic nerve kidney problems hypokalemia (low potassium levels) deficiencies in other nutrients, particularly folic acid and iron Vitamin B12 injections typically begin to work straight away
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