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Conversely, some studies show that a deficiency in vitamin B12 may cause appetite loss, potentially leading to weight loss if left untreated ( If youre low or deficient in B12, your healthcare provider will likely recommend oral vitamin B12 supplements or injections to increase your blood levels ( summary Low levels of vitamin B12 can cause megaloblastic anemia, which is characterized by shortness of breath, headaches, and fatigue
Treatment should not be delayed if neurological symptoms occur, as nerve damage may become irreversible without prompt B12 replacement
Molecular size is the first lever
See these diagrams: Source: Clinical Procedures for Safer Patient Care by Doyle & McCutcheon
How Quickly Do B12 Injections Start Working
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