1000mcg b12 injection Cyanocobalamin Injection, 1000 mcg/mL 1mL Vial Cyano is a form of vitamin B12 that is man What Is B12 Injection What's
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There is no single number that answers this for everyone

Uddin et al

It has been observed that the liver is used to store Vitamin B12 in excess to decrease the likelihood of deficiency

If your energy crashes mid-week every week, you might do better splitting that 0.5mL into two 0.25mL shots every 3.5 days
