Common Symptoms of a Vitamin B12 Deficiency If you think you may be low, watch out for these symptoms: Feeling tired, fatigue and weakness Loss of appetite Constipation Weight loss Megaloblastic anemia Numbness and tingling Poor balance or coordination Confusion Memory loss Depression (21) Soreness of mouth and/or tongue (22) Be aware that many symptoms of B12 deficiency overlap with symptoms of other health conditions, so it's important to see your doctor for a definitive diagnosis
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The less time the system is open, the better
Giannoudis PV, Calori GM, Begue T, Schmidmaier G
Small soluble nutrients such as saccharides, amino acids, vitamins, divalent metals, and organic ions are absorbed by a broad variety of integral membrane transport proteins such as the glucose transporter SGLT1 and the organic ion transporters (OAT)s [11,12,13]