How Long Does It Take Vitamin B12 Injections to Work? B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injections for Aging and Longevity InVita Wellness Just got your B12 injection? Heres why it matters what you eat: alcohol can block absorption, high sugar processed foods can spike inflammation, and greasy meals slow digestion all of which can Can you drink alcohol while taking your medications? Its important to know which medications interact with alcohol. Some medicines can cause serious side effects or make your treatment less effective