Seeing Red: Do B12 Injections Work? LAmag How Quickly Do Vitamin B12 Injections Work? Prime Aesthetics 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 It might not be your lifestyle it could be a B12 deficiency. B12 is essential for energy, mood, and overall wellness and when levels are low, your body feels it. Our Vitamin B12 injections have been around for years but do you know who benefits most from them? B12 support may be a great option if you: Feel tired or low on Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa