| Gastric bypass |
| Standard multivitamin with folate and iron, or prenatal vitamin if female* |
| Vitamin B12 500 micrograms orally/sublingually daily, or 1000 micrograms intramuscularly monthly |
| Calcium 1200 mg to 1500 mg daily with 800 units vitamin D¶ |
| Supplemental iron if iron deficient* |
| Adjustable banding |
| Standard multivitamin with folate and iron* or prenatal vitamin if female* |
| Vitamin B12, iron, calcium with vitamin D as indicated clinically |
