Key B12 deficiency symptoms that are commonly missed or dismissed B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Identifying the early warning signs of vitamin B12 deficiency is crucial for maintaining overall health. Common symptoms include fatigue, pale skin, memory difficulties, and anemia. #deficiency #B12Boost Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa