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 B12 Injections vs Supplements: 16 Key Facts Explained Vitamin B 12 Injections Vs Oral Pills: Expert Insights Regenics Blog 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. How Often Can I Take B12 Injections?