Getting The Best Out Of B12: Injections, Pills Or Food: Valley Spinal Care: Chiropractic Clinics 9 Best Vitamin B12 Supplements Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. B12 Injections vs Tablets: What You Need to Know Benefits of a Vitamin B12 Injection, Vitamin B12 injections are commonly used for people who are deficient, struggle to absorb B12 from tablets, or require a faster and more effective boost., Helps