Q&A: Do B12 injections help with fat loss? The iDiet 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 Pills Baltimore: Which Works? Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project What are Vitamin B12 injections Vitamin B12 injections are used to quickly raise your B12 levels when they're low or when your body can't absorb it properly from food or tablets. What