Is Vitamin B12 Injections Safe During Pregnancy Has anyone paid for a vitamin b12 injection while pregnant? I was told by the aesthetician that it's safe during pregnancy, and I will be asking my midwife first too but just Is a 1 mg intramuscular vitamin B12 injection safe for a pregnant woman with confirmed B12 deficiency and no known cobalamin allergy or severe renal hepatic impairment? Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical Compounded Cyanocobalamin (Vitamin B12) Injection Empower Vitamin B12 is essential for brain development, especially in early pregnancy when baby's nervous system starts forming. . Recently, a study evaluated how maternal vitamin B12 status affects children's cognitive function at