Post‑Sleeve Gastrectomy Supplementation Guidelines

Multivitamin‑Mineral Regimen

• Administer two complete adult multivitamin‑mineral tablets daily, each providing iron, folic acid, zinc, copper, selenium, and thiamine at ≈200 % of the RDA. 1
• Begin the multivitamin regimen 2–4 days after hospital discharge and maintain it lifelong. 4
• Use chewable or dissolvable formulations for the first 3–6 months to accommodate altered gastrointestinal absorption. 4

Calcium & Vitamin D

• Provide calcium citrate to achieve a total daily calcium intake of 1 200–1 500 mg (food + supplements). 1
• Split calcium doses into ≤600 mg per administration to improve absorption. 1
• Separate calcium from iron supplements by ≥2 hours, as concurrent intake impairs absorption of both minerals. 5
• Calcium citrate is preferred over calcium carbonate because its absorption is independent of gastric acidity. 4
• Supplement with vitamin D 3 000 IU daily (ergocalciferol D₂ or cholecalciferol D₃). 1
• Adjust dosing to keep serum 25‑hydroxyvitamin D ≥30 ng/mL (≥75 nmol/L per British guidance). 5
• Some patients may require 2 000–4 000 IU daily for adequate levels. 5

Vitamin B12

• Provide 250–350 µg oral B12 daily or 1 000 µg sublingual weekly; an alternative schedule is 1 000 µg monthly. 1
• The British guideline recommends routine intramuscular B12 every 3 months after sleeve gastrectomy. 5
• Because functional deficiency can occur despite normal serum B12, assess homocysteine and methylmalonic acid when indicated. 4

Iron

• Supply 45–60 mg elemental iron daily from the multivitamin plus any additional iron supplement. 1
• For women of child‑bearing potential or those at higher anemia risk, increase to 50–100 mg elemental iron daily. 1
• Separate iron from calcium by ≥2 hours to avoid competitive absorption. 5

Additional Micronutrients

Thiamine (Vitamin B1)

• Included at dietary‑reference‑intake levels in the routine multivitamin. 1
• Consider 200–300 mg extra thiamine daily (or a B‑complex) during the first 3–4 months post‑surgery. 5

Folic Acid

• Provide 400 µg daily within the multivitamin. 1
• Increase to 800–1 000 µg daily for patients who are pregnant or planning pregnancy. 1

Zinc & Copper

• Include 15 mg zinc daily in the multivitamin formulation. 5
• Pair zinc with 2 mg copper daily to prevent copper deficiency. 5

Vitamin A

• Supply 6 000 IU vitamin A daily (as retinol) in the routine multivitamin. 1
• For pregnant patients or those planning pregnancy, use β‑carotene instead of retinol. 1

Selenium & Vitamin C

• Selenium is incorporated in the complete multivitamin‑mineral supplement. 5
• Vitamin C is provided at DRI‑recommended amounts within the routine multivitamin. 1

Protein Requirements

• Aim for 60–80 g protein per day (≈1.1–1.5 g/kg ideal body weight). 3
• Prioritize high‑quality protein sources such as dairy, eggs, fish, lean meat, soy products, and legumes. 2
• Include leucine‑rich foods (soy, eggs, meat, lentils, hard cheese) to support muscle preservation. 2
• If dietary intake is insufficient, supplement with whey protein to ensure adequate leucine provision. 2

Monitoring & Compliance

• Perform laboratory monitoring every 6 months (e.g., CBC, iron studies, vitamin D, B12, trace minerals) to detect deficiencies early. 4

Common Pitfalls to Avoid

• Never co‑administer calcium and iron; keep a minimum 2‑hour interval between them. 5
• Never supplement zinc without concurrent copper, as this can precipitate severe copper deficiency. 5
• Do not assume normal serum concentrations guarantee sufficiency; functional deficiencies may still be present. 4