About David Gans
Gastric bypass patient covering all WLS multivitamins
Lost 231 lbs after gastric bypass in January 2024
My story
I am David Gans. I had gastric bypass in January 2024 and walked out of surgery into a set of rules that nobody had fully explained to me. Drink slowly. Protein first. Chew everything twice. Take your vitamins every day for the rest of your life, or your labs will crash.
I took the rules seriously. In the 15 months after surgery I lost 231 lbs. That is the number every bariatric patient asks about, so I put it up front: 231 pounds, across roughly a year and a half of strict protein targets, walking, and a boring supplement routine. No miracle, just the post-op protocol done the way my bariatric team said to do it.
The vitamin part was the one that surprised me. I thought any bottle that said bariatric on the label would be fine. That is not how it works. Some formulas are built for gastric bypass patients, some for gastric sleeve patients, some for revision patients, and the pricing between them makes no obvious sense. If you take the wrong one, you pay more than you should and sometimes miss your clinic's numbers. If you take the right one, a daily multivitamin costs less than a coffee.
So I started comparing. I pulled the label data on every bariatric multivitamin I could find, checked the Amazon price, worked out cost per day, and built a spreadsheet. Then I got annoyed at my own spreadsheet and built the Dutch Goose network of bariatric comparison sites. BestBariatricMultivitamins.com is the cross-surgery home base that covers every WLS patient, regardless of which surgery you had.
Why BestBariatricMultivitamins.com exists
There are a lot of bariatric vitamin sites online. Most of them are either run by a single brand ranking its own products, or they are SEO-driven affiliate sites listing every product in existence without caring which surgery you had. Neither is useful to a patient who walks out of a post-op appointment and needs to buy something in the next 48 hours.
BestBariatricMultivitamins.com is built around one question: what is the cheapest bariatric multivitamin for a post-op patient this month? The compare page shows all 15 products in the catalog, sorted by price per day. The nutrient panel lists iron, B12, and vitamin D content so you can confirm with your bariatric team that the formula matches what they asked for. That is the whole workflow.
I am not a doctor. I am not a registered dietitian. I am a patient who reads the product labels and ranks what I find by one number. I write in first person because that is the honest frame for this work. If you have a clinical question, your surgeon and your bariatric dietitian are the right people to talk to. This site narrows the shopping list before that appointment, not after.
This site is part of the Dutch Goose network, which also includes BypassVitamins.com for gastric bypass patients and SleeveVitamins.com for gastric sleeve patients. All three sites share the same underlying 15-product catalog. The surgery-specific sites are tuned to one patient population if that is what you prefer. This site keeps the catalog whole so you can compare across surgery types in one view.
How I rank products
Four rules, in this order. Nothing else changes the ranking.
Rank by price per day
Price per day is the only sort order that matters for a vitamin you take for life. Every product is scored using its Amazon price divided across the servings per container, normalized to a 3-month (90-day) supply where available because that is the cheapest way most bariatric vitamins are sold.
Manufacturer label, not marketing
Every multivitamin in the catalog is sold by its manufacturer as a bariatric-surgery product. I do not include general multivitamins, gummies, or wellness blends that happen to mention the word bariatric in a blog post. Only products whose own label targets bariatric surgery patients make the list.
Cover every WLS surgery
Gastric bypass, gastric sleeve, mini-bypass, and revision patients all need a bariatric multivitamin. The compare page shows the same 15 products to every patient so you can apply your clinic's guidance across one honest catalog rather than hopping between brand sites.
Update monthly
Prices change. Amazon listings churn. I re-check every product in the catalog every month. When a product is discontinued or reformulated, it gets updated or removed. The last-updated date at the bottom of the compare page reflects the most recent audit.
ASMBS reference targets, like 45 to 60 mg iron for Roux-en-Y bypass or 18 mg iron for sleeve, appear in the educational guides on this site for context. They are not used to filter the compare page. The catalog is based on manufacturer labeling, and your bariatric team is the right source for which formula fits your surgery and your labs.
How this site makes money
BestBariatricMultivitamins.com is reader-supported. When you click an Amazon link on this site and buy the product, Amazon pays a small referral fee at no extra cost to you. That is the only way the site is funded. I do not take sponsorship money from supplement brands, and no brand pays to be listed or ranked higher.
The Amazon Associate relationship is disclosed on every comparison page and inside the site footer. The FTC requires it, and you deserve to know. If the affiliate model ever creates a conflict with honest product ranking, the rule is simple: the ranking wins. If the cheapest manufacturer-labeled formula is not in the Amazon program, it still gets listed first. The goal is to help bariatric patients not overpay for the wrong vitamin, not to maximize commission.
Get in touch
If a price looks wrong, a product should be added, a label changed, or you just want to say hello, I read everything. The form on the right goes to my inbox. You can also email directly.
contact@bestbariatricmultivitamins.comOr jump straight to the ranking.
Compare all 15 bariatric multivitamins →