B12 Shots often contain either methylcobalamin or cyanocobalamin, both of which support red blood cell formation and nerve health
Samulak JJ, Sawicka AK, Hartmane D, et al

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Pagano G, Manfredi C, Pallard FV, Lyakhovich A, Tiano L, Trifuoggi M (2021) Potential roles of mitochondrial cofactors in the adjuvant mitigation of pro-inflammatory acute infections, as in the case of sepsis and COVID-19 pneumonia