Gastric Bypass Vitamin Guides
Research-backed articles for bypass patients. Iron, B12, calcium, vitamin D, thiamine, zinc, protein, and more. Written by David Gans, updated weekly.
Best Multivitamin After Gastric Bypass Surgery (2026)
My top 3 editorial picks ranked by price per day, iron content, and patient reviews. Updated April 2026.
Read article →What Vitamins Do You Need After Gastric Bypass Surgery?
A complete guide to iron, B12, calcium, and vitamin D after Roux-en-Y. ASMBS daily targets and why regular vitamins fall short.
Read article →How Much Iron Do You Need After Gastric Bypass?
Bypass patients need 45-60mg of elemental iron daily per ASMBS. Why elemental iron is counted, ferritin targets, and lab schedule.
Read article →How Much B12 Do You Need After Gastric Bypass?
1,000mcg daily in sublingual or liquid form. Why normal B12 absorption fails after Roux-en-Y and how to prevent nerve damage.
Read article →Vitamin D After Gastric Bypass: What You Need to Know
ASMBS recommends 3,000 IU of D3 daily. Why D3 outperforms D2 and why low vitamin D silently damages your bones.
Read article →Best Calcium Citrate Supplement After Gastric Bypass (2026)
5 calcium citrate products ranked by price per day, dosing guidance, and why citrate beats carbonate after bypass.
Read article →Thiamine After Gastric Bypass: Why B1 Matters
Thiamine deficiency can develop within weeks after bypass. ASMBS targets, warning symptoms, and why programs exceed the 12mg minimum.
Read article →Zinc Deficiency After Gastric Bypass: Symptoms and Solutions
Zinc deficiency affects up to 40% of bypass patients. Symptoms, 8-22mg target, best forms, and why copper balance matters.
Read article →Do Bariatric Vitamins Cause Nausea? What Bypass Patients Need to Know
Nausea from bariatric vitamins is common and almost always fixable. Iron form, timing, and which multivitamins are gentlest.
Read article →Gummy Vitamins After Gastric Bypass: Why They Fall Short
Why gummy vitamins are not recommended after gastric bypass, and what a complete bariatric formula should actually contain.
Read article →Best Protein Powder After Gastric Bypass: Label Math That Works
60-100g protein daily after surgery. How to choose a powder using bariatric goals: 20-30g per serving, under 5g sugar, 100-200 calories.
Read article →Hair Loss After Gastric Bypass: Causes and What Helps
Hair loss after bypass is common and often temporary. Which deficiencies play a role, protein targets, and when to ask for labs.
Read article →Compare Calcium Citrate Products
Interactive calcium citrate comparison for bypass patients. Filter by form, brand, rating, or price per day.
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