We're now offering a private vitamin B12 injection service, delivered by trained healthcare professionals following a suitability assessment. Vitamin B12 plays an important role in energy levels, nerve function and red blood How Long Does It Take Vitamin B12 Injections to Work? Struggling to get your B12 injection at the GP? Working in Dublin city centre? We've got you covered. Conefrey's Pharmacy now offers a Vitamin B12 administration service for patients who've been advised Vitamin B12 Injectable City Cat Pharmacy is available for clients of City Cat Vet Clinic only.