Version July 2025
| 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 to 1500 mg daily¶ |
| Vitamin D 800 international units (20 micrograms) daily |
| Supplemental iron if iron deficient* |
| Adjustable banding |
| Standard multivitamin with folate and iron (or prenatal vitamin if female*) |
| Vitamin B12, iron, and calcium with vitamin D as indicated clinically |
* Additional iron and folate may be necessary in pregnant females.
¶ Calcium dose refers to elemental calcium. Calcium citrate may be better absorbed than other forms of calcium (eg, calcium gluconate, calcium carbonate).
