If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that 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 Greenway and Cippenham in Slough Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa Feeling awful after 2nd loading injection : r B12_Deficiency