Oral manifestations in vitamin B12 deficiency patients with or without history of gastrectomy BMC Oral Health Springer Nature Link Vitamin Bco & B12 Injections: Pricing and Benefits Why Do I Feel Worse After My B12 Injection: 6 Body Reactions Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa Vitamin B12 Deficiency: Signs & Symptoms Vitamin B12 is essential for nerve health, red blood cell formation, and brain function. When B12 levels are low, symptoms often develop slowly and silently,