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The Ultimate Truth to Vitamins and Supplements After Bariatric Surgery

Consuming Vitamins and Minerals Post Bariatric Surgery

Would love your thoughts, please comment at the end of the post!

Bariatric surgery permanently alters your lifestyle. This means that you will have to take lifelong vitamin and mineral supplementation. A stricter supplementation regimen will have to be followed in case you opt for Duodenal Switch or Roux-en-Y Gastric Bypass.

Look out for signs and symptoms of malnutrition after gastric bypass and keep a tab on your health.

Our Bariatric Nutritionist says:

Think of vitamins/minerals as life-long medications. Each year, get your labs checked to make sure everything is in the right range. Everyone is different, and two people who take the same supplements can have utterly different lab results. At certain points in your life, you may need to invest more or less of some vitamins and minerals.

Recommendations for Vitamins and Minerals Post Bariatric Surgery

Thiamin (B1)

For Men For Women
12 mg 11 mg


Taken Orally or Nasally Monthly Intramuscular Injection
300-500 mcg 1000 mcg


Generally Women for Childbearing Age Gastric Bypass Patients
400-800 mcg 800-1000 mcg 800 mcg


Dose Best forms of Absorption
45-60 mg Ferrous Sulfate, Ferrous Fumarate, Ferrous Gluconate

Have you had your iron checked recently, and it was low? Try taking your multivitamin that contains iron or a separate iron supplement with 1/4 of orange juice diluted in 1/4-1/2 cup water. The vitamin C may help your body absorb the iron in the vitamins by converting it into a form that is more readily available in your body.


For Men and Post Menopausal Women Others How to Take
1200 mg 1500 mg Split into three doses of 500 mg. with a gap of at least 4 hours

If calcium carbonate take with meals, if calcium citrate take with or without meals


Vitamin Dose
Vitamin D 3000 IU/day
Vitamin A 5000-10,000 IU/day
Vitamin K 90-120 mcg/day
Vitamin E 15 mg/day


Gastric Bypass 100-200% of RDA 8-22 mg/day
Gastric Sleeve 100% of RDA 8-11 mg/day


Gastric Bypass 200% of RDA 2 gm
Gastric Sleeve 100% of RDA 1 gm

Daily Dose of Vitamins Supplements

Check out this video in which she further talks about nutritional supplements after gastric sleeve and gastric bypass surgery:

Hi everybody. I’ve been getting questions about vitamins and minerals, and people have been posting pictures of the labels to see if this is good enough to meet their needs which I love. I love all the communication and the dialogue that comes along with that.

Bariatric Patients Have Individual Nutritional Requirements

I wanted to give more detail as to what to look for or to bring, maybe, your stress down a little bit.

So, the recommendations that we give are from the ASMBS which is the ‘American Society for Metabolic and Bariatric Surgery.’ The recommendations are basically what that they found through research that meets most people’s needs that have gone through the surgery.

  • It’s not going to meet everyone’s needs 100%. Someone who is 5’10” male and weighs 240 pounds might need one thing. Someone who is a male, 6’01” and 240 pounds might need something else.
  • The same way that we are all different shapes, colors, sizes it is the same way with our vitamins and nutrient needs.
  • We are given estimated guesses as to what meets the needs of most people and then as time goes on, we adjust that to meet your specific needs.

So, it is essential to get regular vitamin and mineral checks to work with your physician and your nurse practitioner wherever you live. Also, get those labs done so that your nutritional levels are determined, and to adjust the dosage from there.

Individual Nutritional Needs Post WLS

Special Weight Loss Surgery Tip Nutritionist Tip – To Patch or Not to Patch

Very few vitamins can be absorbed through the skin in the amounts needed by the body for anyone, and especially after undergoing weight loss surgery. Maybe someday technology will get this far, but right now the studies show that the patch does not show enough absorption.

Nutritional Supplements after Gastric Sleeve or Bypass

But anyway, so you need to, you know, as time goes on get those labs checked and then maybe like I said you could go down in your B12 or you need to go up in your Calcium and Vitamin D.

I know it is frustrating… all you want to have a link to a vitamin which is good for pre-op or post-op and then in 2 months; you’ll maybe change something. You want to have one thing that you go to and buy… it is not really how it works. It is kind of frustrating to find something, but it is a part of the process.

  • Some people can do a capsule from day 1 post-op and have no issues whatsoever.
  • Other people can do a capsule until they are two months, six months, a year after surgery…they need the chewables and the liquid.
  • And sometimes, what you tolerate might not meet 100% of your needs…so, you might need to take two doses of something as opposed to just one treatment as it is on the label.
  • You might need to take one dose of this product and maybe another dose of a different product to meet your needs.

It can be kind of frustrating and time-consuming, but it is not a one-in-done thing. And so, as time goes on you might use one product now and in six months from now, you might discover that it is not meeting your needs…you feel like you need something else or you are sick of liquid or the flavor of the chewable, and you want to try a different product. It is one of those things that will kind of ebb and flow as time goes on.

Vitamins and Minerals After Bariatric Surgery

Importance of Iron Post Weight Loss Surgery

I wanted to go ahead and do a post today about iron supplementation after bariatric surgery. It is an essential nutrient. It is a very important vitamin, and you should make sure you’re taking it especially if you have had issues with low iron in the past.

Some things to remember to do:

  • Always take it with enough fluids since we can’t gulp liquids anymore.
  • You want to make sure that you’re sitting down and taking the time for some small sips every 30 seconds or so to make sure that the iron supplement goes down to your new pouch okay.
  • Also, take it with a form of food or liquid that contains vitamin C. If you are early post-op, you’re not going to want to take it with food but maybe having it with some diluted orange juice can work. That Vitamin C helps the body to absorb the iron.
  • You could also maybe eat a few strawberries with it or some clementines or a couple of orange slices. That will work as well.

How to Avoid Constipation Caused by Iron after Weight Loss Surgery

Constipation after bariatric surgery can be another big issue for people.

  • So, make sure you can get enough fiber from fresh fruits, fresh vegetables, whole grains.
  • You could even take a fiber supplement because iron can be very constipating for some individuals.

So, if you have had any issues with iron, go ahead and post it in the comment section below. If you have some tips for how you got over your problems with iron supplements, we would love to hear from you as well and pass on such knowledge to other people.

  • Vitamins after bariatric surgery
  • Bariatric vitamins
  • Vitamins for gastric bypass
  • Post-bariatric surgery vitamins
  • Weight loss surgery vitamins
  • Vitamins for gastric bypass patients
  • Gastric sleeve patients vitamins list
Updated on January 3, 2019

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