Efficacy and Adverse Side Effects of Two Forms of Iron in Pregnancy

Inclusion Criteria: * Pregnant individual (singleton pregnancy) * 19-42 years of age * Living in the greater Vancouver area and willing to travel to the University of British Columbia or BC Women's Hospital for study visits * 13-25 weeks gestation * Willing to participate and able to provide informed consent Exclusion Criteria: * Having a pre-existing medical condition known to impact iron status (e.g., inherited hemoglobin disorder (i.e., sickle cell, hemochromatosis, thalassemia or other structural hemoglobin variant), malabsorptive disorders (i.e., chronic pancreatitis, cystic fibrosis, celiac disease) and inflammatory bowel disease (i.e., Crohn's disease, ulcerative colitis), gastric bypass surgery, atrophic gastritis, advanced liver disease, kidney dialysis) * Using medications known to interfere with iron metabolism or the gut pathogen equilibrium (e.g., chronic use of proton pump inhibitors, anti-inflammatory agents, non-steroidal anti-inflammatory drugs, antibiotics) * Having a personal neural tube defect (NTD) history or a previous NTD pregnancy * Receiving ongoing blood transfusions * Currently smoking or having smoked in the past 3 months * Pre-pregnancy body mass index (BMI) ≥30 kg/m\^2 * Allergy to any study supplement ingredients