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Type of supplements in the first 4–5 months of pregnancy as reported by 40,108 women participating in MoBa
| n–3 fatty acids (cod liver oil/fish oil) | 23,615 (58.6%) |
| Folic acid | 14,259 (35.6%) |
| Multivitamins and minerals | 12,351 (30.8%) |
| Iron tablets/formulation | 8,668 (21.6%) |
| Multivitamins | 5,648 (16.3%) |
| Pregnancy formulations | 1,888 (4.7%) |
| Calcium tablets | 1,273 (3.2%) |
| Herb supplements | 871 (2.1%) |
