b12 injection frozen Compounded Methylcobalamin (Vitamin B12) Injection, 5mg/mL Vitamin B12 Injection: Energy Boost

The effect of oral glucose on serum free insulin-like growth factor-I and -II in health adults

Vitamin B12 supplementation is considered safe during pregnancy with no evidence of harm to the developing fetus at recommended doses

Please read this article on how people with inherent COVID immunity (due to past COVID infection) may react strongly to the vaccine: I think everyone will have to choose between short-term vaccine-related illness and the greater good of society/risk r of contracting COVID

However, if its a skin complex that youve been taking, that contains other herbs, vitamins, minerals, probiotics and other fillers or additives in, we dont really know if its the B12, biotin or something else