Most digestive problems like GERD keep you from absorbing this vitamin
Vitamin B12 Deficiency Anemia Diagnosis Your doctor will do a physical exam and might order one or more of these tests: Complete blood count
Interestingly, T-cell responses to the 22 conserved epitopes within this vaccine were enriched in individuals with asymptomatic infections relative to individuals with symptomatic infection [151]
In addition, B12 deficiency-associated fatigue is often accompanied by other symptoms such as numbness and tingling, cognitive impairment (memory and concentration problems), mood swings (depression), skin changes (pale skin), shortness of breath, or fast heart rate
A., Rytlewska, M., Jasklska, M., & Chmielewski, M