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Other research has shown that women with too little B12 during pregnancy can damage a child's brain development

Metal allergy--a review on exposures, penetration, genetics, prevalence, and clinical implications

While the test focuses on peptide and metabolic genetic markers rather than B12-specific variants, it can reveal broader predispositions in genes like FTO and MC4R that relate to metabolic efficiency

Vitamin B12 shots are the most common way to correct or prevent a B12 deficiency

Signs and symptoms of a serious allergic reaction include chest tightness, trouble breathing, swelling, hives, itching, and rash