Vitamin Injections vs. Oral Supplements: What's the Difference? Vital Flow Infusions 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 Should You Take Natural vs. Synthetic B12? Danville, CA Wellness Center Compares Vitamin B12 Injection vs Oral Supplement