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B12 injections are an intramuscular shot of Vitamin B12 (typically in the form of cyanocobalamin or methylcobalamin) that delivers the vitamin directly into the bloodstream

These may include: ( 4 ) Fatigue or lack of energy Brain fog or trouble concentrating Irritability or mood swings Pale skin or shortness of breath Tingling in the hands and feet Difficulty walking or staggering Anemia Swollen or inflamed tongue A B12 deficiency in men may also contribute to low testosterone, weight gain, and poor exercise recoverymaking it a hidden factor in many mens health concerns

doi: 10.1016/j.bbadis.2023.166986 31

It also reduced TNF-alpha levels, a key inflammatory cytokine