Vitamin B12 Injections vs. Oral Supplements: Which is Better? Uniq Laser B12 Injections vs. Oral Supplements: Which Works Better? Low Vitamin B12? Diet vs. InjectionsWhat Works Faster? Are Vitamin B12 Tablets As Good As Injections? medicalweightlosscentersofamerica.com 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 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)