B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injections Side Effects & Reactions PA Relief How Long Does a B12 Shot Last? LiveVibrant Wellness Guide If you've been feeling run down lately you could be deficient in Vitamin B12. Physical symptoms of B12 deficiency include mouth ulcers, fatigue, digestive issues and muscle aches. There are also neurological Vitamin injections aren't just trendy. They're targeted. They can help with: Energy levels Immune support Brain fog Recovery And because they bypass digestion, your body actually absorbs what