15 In contrast, falsely normal levels may be seen in patients with liver disease, myeloproliferative disorders, or renal disease
A vitamin B12 deficiency can cause extreme fatigue, among other symptoms, and leave individuals feeling weak and foggy
Another class of gastric acid inhibitors known as histamine 2 (H 2 )-receptor antagonists (e.g., cimetidine, famotidine, and ranitidine), often used to treat peptic ulcer disease, has also been found to decrease the absorption of vitamin B 12 from food
Always follow up as scheduled so your provider can make that decision with you
After receiving a B12 shot, avoid heavy lifting or intense physical activity for the first 24 hours to minimize soreness at the injection site