Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa B12 Shots for Energy & Wellness Vitamin B12 Injection Southern Cosmetic Laser Feeling more tired, sluggish or low in mood? You're not alone shorter days and colder weather can leave your body needing that little bit of extra support. Vitamin B12 injections are Main benefits of B12 injections 1) Increased energy & reduced fatigue B12 helps convert food into usable energy Deficiency often causes tiredness, weakness, and low stamina 2) Healthy red blood cells Prevents