If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that You might need a B12 injection if you're constantly feeling tired, run down, or low on energy. B12 supports energy levels, metabolism, mood, and neurological health. to help your body feel its What You Need to Know About Vitamin B12 Duane NP Do B12 Injections Help With Fatigue? The Aspen Clinic Vitamin B12 My Healthy Vibes