Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves Feeling tired, dizzy, or experiencing tingling sensations? These could be signs of Vitamin B12 deficiency. Early detection and the right nutrition can prevent long term complications. Get your levels checked today! #vitaminb12 # Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa Key B12 deficiency symptoms that are commonly missed or dismissed B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics