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Kassebaum, Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, USA Leila Larson, Arnold School of Public Health, University of South Carolina, USA
Doctors often investigate both vitamin B12 and folate levels together because deficiencies can create similar symptoms, including: Low folate and vitamin B12 deficiencies may also contribute to hair thinning, which explains why caregivers frequently search can folic acid deficiency cause hair loss or can lack of folic acid cause hair loss. Importantly, caregivers should avoid assuming the worst after seeing a low B12 result
10.1016/s0197-4580(01)00250-0 Neurobiol
Variants in the last two groups, although of much interest to biologists, geneticists, and anthropologists, are of no major clinical significance