Benefits of B12 Injections for Optimal Health B12 deficiency doesn't always look obvious. It usually shows up as things people brush off low energy mental fog feeling off but not sure why The problem is, oral B12 injections have lots of benefits from just 1 dose. A dose can be given every 6 months to boost benefits, unless you have a b12 deficiency or pernicious anaemia with proof Vitamin B12 Injection Dose: 7 Key Guidelines for Safe and Effective Treatment Liv Hospital