Quadruple Fortified Salt Trial in India

Inclusion Criteria: * Women between 18 and 49 years of age * Healthy * Not pregnant or lactating * Plan to reside in the catchment area of our periconceptional surveillance program for at least two years Exclusion Criteria: * Severe anemia (Hemoglobin \<8.0 g/dL) * Reported diagnosis of HIV, malaria infection, or active tuberculosis disease * Malabsorption disorders (i.e., medical conditions that may affect vitamin B12 absorption or metabolism) * Stage 2 hypertension (SBP≥140 mm Hg or DBP≥90 mm Hg) * Glycated hemoglobin (HbA1c) ≥6.5% * Other serious pre-existing medical conditions (e.g., defined as the need for regular medication use), active infections, or acute illnesses * Previous pregnancy affected by a neural tube defect (i.e., who have had a fetus diagnosed as affected by a neural tube defect or have given birth to a baby with a neural tube defect) (will be referred to OB/GYN for standard of care, including folic acid supplementation, and excluded) * Planning to become pregnant (or planning to have a child) in the next 12 months (will be referred to OB/GYN for standard of care, including folic acid supplementation, and be excluded) * Daily micronutrient supplements (i.e., tablets, capsules, dispersible tablets; ≥4 times in the past week) * Intramuscular or intravenous interventions containing medications or micronutrients (e.g., iron, vitamin B12, folic acid) in the past 3 months