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Other than that, low vitamin B12 levels are more common in those who are: Older than 65 years of age

Note that this test needs to be ordered through your practitioners account or via Direct Labs self-ordering

Low B12 levels during pregnancy have been associated with an increased risk of low birth weight, preterm birth and miscarriage

PMID 20445536.

Some practitioners employ intermediate dose increases, such as escalating by 0.25 mg increments rather than doubling doses, to improve tolerance in sensitive patients

National diabetes care guidelines encourage doctors to check B12 in people on long-term metformin, especially those who already have anemia or nerve tingling in the hands or feet