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Pregnant or Breastfeeding Women: The increased nutritional needs during pregnancy and breastfeeding may require B12 supplementation to support both mother and child

This article explains why a person with Crohns disease may have a vitamin B12 deficiency and how doctors may diagnose it

Generally, it will take several weeks to several months for B12 levels to return to normal after starting supplementation

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Nasal Spray: Emerging in 2025 as a potential rapid-delivery research method for localized CNS or vascular endpoints, though formulation standardization remains variable