i have b12 injections but still tired Why do feel worse after a injection? B12 Shots for Energy: Clinical

With consistent supplementation, many people notice sharper mental clarity, reduced stress, and better emotional stability

When this happens, nerve signals can get crossed, leading to involuntary muscle twitches

Even your lifestyle, like how much you exercise and what you eat, can influence how your body uses the nutrients in MIC B12

Professor and Chair, Department of Nutritional Sciences Rutgers, The State University of New Jersey Copyright 2000-2026 Linus Pauling Institute Figure Alternative Text Figure 1

Injection Site Reactions: You may experience redness, itching, or swelling at the injection site

Vitamin injections (usually given as a quick jab into the muscle) are absorbed quickly and can give you noticeable results within 24 hours