Are B12 Shots Safe? Royal Palm Beach Medical Group how often should you take vitamin b12 injections Optimal Vitamin B12 Dosage and Treating Deficiency 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 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 Struggling with B12 injection frequency? Here's what you need to know If you have Pernicious Anaemia (PA) or B12 deficiency due to autoimmune gastritis, NHS guidance is clear: You should