Vitamin B 12 intramuscular injections are also used therapeutically to help restore energy and combat various symptoms related to such deficiencies. Vitamin B 12 is essential to the development of healthy blood cells, nerve Low Vitamin B12? Diet vs. InjectionsWhat Works Faster? A vitamin B12 injection is a shot that delivers B12 directly into your muscle, helping your body absorb it quickly (especially if your body struggles to absorb it from food or tablets) Vitamin B12 Injections vs. Oral Supplements: Which is Better? Uniq Laser