Optimal B12 Injection Sites for Maximum Absorption and Benefits Your Health Magazine Vitamin B12 Injections: Benefits and Risks Red liquid (vitamin B12) in a disposable syringe with a needle and in a glass ampoule on a white background. Lots of empty space Stock Photo Alamy Vitamin B12 Injectable City Cat Pharmacy is available for clients of City Cat Vet Clinic only. Boost your energy with B12 injections Stop by when our nurse staff is available for injection, or pick one up to administer at homeeasy and convenient. $25 per shot! DM us