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  3. The Best Vitamins to Take After Bariatric Surgery

The Best Vitamins to Take After Bariatric Surgery

Vitamins and Nutrients After Bariatric Surgery


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There isn’t one vitamin that contains everything you need after bariatric surgery. Our US-registered bariatric nutritionist typically recommends a bariatric-specific vitamin as that will meet most of your requirements.

You’ll also likely need an additional B12 supplement and Calcium + Vitamin D. Some people will require extra iron supplementation as well.

Nutritional Supplements After Weight Loss Surgery – Dosage

Here are the recommendations:

  • Thiamin (B1): at least 12mg, preferably 50mg from a B-complex supplement
  • B12: 300-500 mcg daily if you take it orally, nasal as directed, or 1,000mcg intramuscular (injection) monthly
  • Folate: 400-800 mcg daily and women of childbearing age should take 800-1000mcg daily. 800mcg for gastric bypass patients
  • Iron: 45-60 mg of elemental (separate it from calcium and acid-reducing medications
  • Calcium: 1200-1500 mg/day in divided doses of 300-500mg (if calcium carbonate, take with meals and if calcium citrate, take with or without meals)
  • Vitamin D: 3000 IU daily
  • Vitamin A: 5,000-10,000 IU/day
  • Vitamin K: 90-120 mcg/day
  • Vitamin E: 15 mg/day
  • Zinc: For gastric bypass 100-200% of RDA or 8-22 mg/day; for sleeve 100% of RDA or 8-11 mg/d
  • Copper: Gastric Bypass is 200% of RDA or 2 gm; sleeve 100% of RDA or 1mg

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