How Vitamin D Heals Your Gut and Improves IBS

Recent evidence is suggesting that vitamin D can help reduce inflammation in and heal your gut. This can

How Vitamin D Heals Your Gut and Improves IBS

Recent evidence is suggesting that vitamin D can help reduce inflammation in and heal your gut. This can lead to a healthier microbiota (the world of bacteria in your gut). Importantly, these changes lead to improvement of digestive symptoms as seen in IBS such as bloating, abdominal pain and altered bowels.


Dr. Michael Ruscio, DC: Hi, this is Dr. Ruscio, and let’s discuss how vitamin D can help you heal your gut and, more importantly, how that healing of your gut can lead to healthier bacteria in your gut and, most importantly, how all these changes can lead to an improvement in your digestive symptoms and your symptoms of irritable bowel syndrome or IBS.

[Continue reading below]

Dr. R’s Fast Facts Summary

Bolus weekly vitamin D3 supplementation impacts gut and airway microbiota in adults with cystic fibrosis: a double-blind, randomized, placebo-controlled clinical trial

  • This exploratory study suggests that vitamin D insufficiency is associated with alterations in microbiota composition that may promote inflammation and that supplementation with vitamin D has the potential to impact microbiota composition

Role of vitamin D on gut microbiota in cystic fibrosis

  • Recent evidence shows that vitamin D acts to maintain the integrity of the gut mucosal barrier by enhancement of intercellular junctions that control mucosal permeability and reduction of pro-inflammatory molecules
  • Due to effects on the intestinal mucosa, maintenance of sufficient vitamin D status may be essential for the development of a healthy gut microbiota, particularly in conditions defined by chronic mucosal inflammation

Gut microbiota interactions with the immunomodulatory role of vitamin D in normal individuals

  • The role of vitamin D in the maintenance of immune homeostasis/ balance seems to occur in part by interacting with the gut microbiota.

Vitamin D appears to support healthy mechanisms in the gut, but can we tie this to positive outcomes? Does this help people feel better?

Effect of vitamin D on gastrointestinal symptoms and health-related quality of life in irritable bowel syndrome patients: a randomized double-blind clinical trial

There are health benefits you may only be able to obtain from sun exposure, so make sure to practice safe sun exposure.

In summary, there is very exciting evidence that vitamin D can help to heal the gut.

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DrMR: So I’d like to start with this first study here. I’m going to through a few studies and tie together a few thoughts for you. So the first study, Bolus Weekly Vitamin D3 Supplementation Impacts Gut and Airway Microbiota in Adults With Cystic Fibrosis: A Double-Blind, Randomized, Placebo-Controlled Clinical Trial.” Their conclusion, this exploratory study suggests that vitamin D insufficiency is associated with alterations in microbiota composition that may promote inflammation. And that supplementation with vitamin D has the potential to impact microbiota composition.
Now remember, if you have inflammation in the gut, that inflammation will create an environment that allows unhealthy bacteria to grow and is poisonous to healthy bacteria. So let’s continue along this theme and look at another similar study.
The role of vitamin D on gut microbiota in cystic fibrosis.” There seems to be a fair amount of research, for whatever reason, on vitamin D, the microbiota, and in the condition of cystic fibrosis. But I will connect this to regular non-cystic fibrosis populations in just a moment. So to quote, recent evidence shows that vitamin D acts maintain the integrity of the gut mucosal barrier by enhancing intracellular junctions that control mucosal permeability, aka leaky gut, and reduction of pro-inflammatory cytokines or pro-inflammatory molecules. Due to effects on the intestinal mucosa or the mucous membrane in the gut, maintenance of sufficient vitamin D status may be essential for the development of a healthy gut microbiota, particularly in conditions to find a chronic mucosal inflammation.

So again, seeing this theme that vitamin D helps with essentially leaky gut, gut function, the gut barrier, and that leads to healthier gut bacteria.

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We’ve discussed previously that your mouth is the first section of your gut. So in order to have a healthy gut, you have to have a healthy mouth. That’s why I like Quip’s Electric Toothbrush, which is ADA approved. That’s the American Dental Association.

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One more study, “Gut microbiota interactions with immunomodulatory role of vitamin D in normal individuals.” The role of vitamin D in the maintenance of immune homeostasis or balance seems to occur, in part, by interacting with the gut microbiota. And just a couple specifics from this study, lipopolysaccharides increase with reduction of vitamin D. Or the lower your vitamin D, the higher lipopolysaccharides are. And lipopolysaccharides are just one measure essentially of leaky gut.

Continuing, after adjusting for age, sex, season—the season of the year will affect vitamin D levels of course, sunny months, higher vitamin D—and BMI or body mass index, there was still maintained an inverse association between vitamin D and Bifidobacterium.

So after we adjust for people with different age, people with different sex, different times of the year, and body weight, all of which can affect vitamin D, we see that as vitamin D goes down, you have a decrease of Bifidobacterium. So there seems to be this positive impact of vitamin D on Bifidobacterium levels.

So, all this is very interesting. We see that vitamin D can help with inflammation, leaky gut, and the bacteria in the gut. But it’s very important to be able to tie these observations to an actual measurable, meaningful outcome in humans. Do these people feel any better? Because if all this stuff was happening underneath the hood and patients felt worse or the same, then it wouldn’t really be that meaningful. So it’s very important we tie these mechanistic changes to an actual measurable positive outcome in humans.

So continuing, “Effect of vitamin D on gastrointestinal symptoms and health-related quality of life in irritable bowel syndrome patients: a randomized, double-blind, clinical trial.” Summarizing, vitamin D improves IBS symptoms compared to placebo. Key, key finding. And in this study, 50,000 IUs were administered every other week, which if you broke that down to a per-day dosing would leave with you about 3500 units, which is pretty common daily dosing for vitamin D, usually between anywhere from 2000 IUs per day to 6000 IUs per day is what’s used. And I’ll also put a link in here to our previous episode where we reviewed this particular study in more detail.

So, that’s very exciting. It’s also important to keep in mind that there are health benefits that you can only obtain from sun exposure and you cannot obtain solely by supplementing with vitamin D. So it’s important to practice safe sun exposure in addition to supplementing with vitamin D. And in my book, Healthy Gut, Healthy You, I lay out specific guidelines for how to use safe sun exposure to optimize your vitamin D levels.

So in summary, we show very exciting evidence that vitamin D can essentially heal the gut; that reduction of gut healing, reduction of leaky gut, and reduction of inflammation in the gut, leads to healthier bacteria in the gut; and then most importantly, all these changes summate to an improvement in people’s health, their well-being, and their digestive symptoms. So vitamin D, very important for one’s gut health, one factor of many to include in your gut healing regimen.

This is Dr. Ruscio and I hope this information helps you to get healthy and get back to your life.

What do you think? I would like to hear your thoughts or experience with this.

Dr. Ruscio is your leading functional and integrative doctor specializing in gut related disorders such as SIBO, leaky gut, Celiac, IBS and in thyroid disorders such as hypothyroid and hyperthyroid. For more information on how to become a patient, please contact our office. Serving the San Francisco Bay area and distance patients via phone and Skype.

Discussion

I care about answering your questions and sharing my knowledge with you. Leave a comment or connect with me on social media asking any health question you may have and I just might incorporate it into our next listener questions podcast episode just for you!

42 thoughts on “How Vitamin D Heals Your Gut and Improves IBS

  1. Thank you so much Dr Ruscio. Amazing as usual!!! One question: how much D3 would you recommend taking for those of us with chronic bowel inflammation? I have your book but have not read it yet :/ It is on the ‘to read’ pile!!! Thanks again, love your articles and podcasts!

      1. Thank you for your reply. I see! It is higher than I thought. Am enjoying reading your book btw! Again, keep up the great work you do. It is much appreciated x

  2. Hi Michael,

    Great information as ever. However, I wish to comment on something other than Vitamin D. Your hair!

    I have to complement you on an outstanding pompadour, rockabilly-style haircut! Look at the height on it. I want to see a video on how you style it and what products you use!

    The future of medicine is about seeing a practitioner who is not only competent, but also has great hair!

    Keep up the good work on all fronts.

    Kind regards,
    Ross

  3. Thank you so much Dr Ruscio. Amazing as usual!!! One question: how much D3 would you recommend taking for those of us with chronic bowel inflammation? I have your book but have not read it yet :/ It is on the ‘to read’ pile!!! Thanks again, love your articles and podcasts!

      1. Thank you for your reply. I see! It is higher than I thought. Am enjoying reading your book btw! Again, keep up the great work you do. It is much appreciated x

  4. Hi Michael,

    Great information as ever. However, I wish to comment on something other than Vitamin D. Your hair!

    I have to complement you on an outstanding pompadour, rockabilly-style haircut! Look at the height on it. I want to see a video on how you style it and what products you use!

    The future of medicine is about seeing a practitioner who is not only competent, but also has great hair!

    Keep up the good work on all fronts.

    Kind regards,
    Ross

  5. I got your book not too long ago as I suspect that I have SIBO and was looking forward to finally treating it with your suggested protocol. However, I live in Canada and noticed that shipping costs to order the recommended supplements are $100 for express shipping with no standard delivery option…any plans to change this to make the products more accessible to those from other countries? Thank you.

    1. We just updated our shipping making the international shipping more affordable. We are doing the best we can here but until we can obtain a shipping center outside the US there might not be a huge change. I’d check the pricing again, it should be less now. If you order strategically, fewer but larger orders, it should also mitigate cost. Working on it!

      1. Just checked and yes, the shipping costs have indeed gone down to $35…. thank you very much for getting back to me and for accommodating us non-US SIBO sufferer 🙂

  6. I have Crohn’s, however I get bad headaches, that turn into migraines when taking even small doses of vitamin d, d3 daily or even every other day. I’ve tried pretty much every form of vitamin d. I don’t seem to get headaches when getting vitamin D.

    I’ve checked my levels of vitamin, minerals in the past and nothing was too high or below.

    I have a very limited diet so i can’t get vitamin d from much else other than avocados, and maybe mushrooms.

    Any advice?

  7. I have Crohn’s, however I get bad headaches, that turn into migraines when taking even small doses of vitamin d, d3 daily or even every other day. I’ve tried pretty much every form of vitamin d. I don’t seem to get headaches when getting vitamin D.

    I’ve checked my levels of vitamin, minerals in the past and nothing was too high or below.

    I have a very limited diet so i can’t get vitamin d from much else other than avocados, and maybe mushrooms.

    Any advice?

  8. Dr. Ruscio,
    If vitamin d can help heal the gut and reduce inflammation then can it help treat and manage autism symptoms since with autism there is a gut and brain connection?

  9. Thank you for the informative read. I suspect that Nordic Naturals Cod Liver Oil /vitaminD(1,000 IU per tsp serving) is helping heal my leaky gut and possible methane SIBO; I know this is all connected in one way or another.

    Question; would it be safe to assume that taking another tsp of the CLO at some point in the day is reasonable (and ideally effective)?

    I recently ordered and received your book-can hardly wait to dive into it. Thank you again for allowing this info to be accessible.

    Kind Regards,
    Laura

  10. Thank you for the informative read. I suspect that Nordic Naturals Cod Liver Oil /vitaminD(1,000 IU per tsp serving) is helping heal my leaky gut and possible methane SIBO; I know this is all connected in one way or another.

    Question; would it be safe to assume that taking another tsp of the CLO at some point in the day is reasonable (and ideally effective)?

    I recently ordered and received your book-can hardly wait to dive into it. Thank you again for allowing this info to be accessible.

    Kind Regards,
    Laura

  11. My son has had two bouts with a complex perianal horseshoe fistula and was finally diagnosed with Crohns. Would Vitamin D supplementation help heal this horrible affliction? If yes, how much? Would he likely still need heavy duty Crohns medications too?

    1. Hi Susan,

      Vitamin D is often low in patients with Crohns, so many doctors recommend it for their Crohn’s patients. Unfortunately, we can’t give personalized medical advice on this forum, so whether it’s a good option for your son and how much to take is something you’ll need to run by his doctor. Good luck!

  12. My son has had two bouts with a complex perianal horseshoe fistula and was finally diagnosed with Crohns. Would Vitamin D supplementation help heal this horrible affliction? If yes, how much? Would he likely still need heavy duty Crohns medications too?

    1. Hi Susan,

      Vitamin D is often low in patients with Crohns, so many doctors recommend it for their Crohn’s patients. Unfortunately, we can’t give personalized medical advice on this forum, so whether it’s a good option for your son and how much to take is something you’ll need to run by his doctor. Good luck!

  13. Hello Dr. Ruscio. I took vitamin D3 4000 u.i for 3 months and didn’t increase nothing in my blood levels. I started to tzke vitamin D 10000 u.i sublingual and only went to 32,0. I have SIBO, gastritis and reflux, LPR. My vitamin D don’t increase because of SIBO? Even if I increase the dose? My blood levels of vitamin A and E are normal.

    1. Hi Rafael,

      It is possible that you’re not responding to vitamin D supplementation due to SIBO. You may want to work with a practitioner to make sure your SIBO is being treated appropriately.

  14. Hello Dr. Ruscio. I took vitamin D3 4000 u.i for 3 months and didn’t increase nothing in my blood levels. I started to tzke vitamin D 10000 u.i sublingual and only went to 32,0. I have SIBO, gastritis and reflux, LPR. My vitamin D don’t increase because of SIBO? Even if I increase the dose? My blood levels of vitamin A and E are normal.

    1. Hi Rafael,

      It is possible that you’re not responding to vitamin D supplementation due to SIBO. You may want to work with a practitioner to make sure your SIBO is being treated appropriately.

  15. I got your book not too long ago as I suspect that I have SIBO and was looking forward to finally treating it with your suggested protocol. However, I live in Canada and noticed that shipping costs to order the recommended supplements are $100 for express shipping with no standard delivery option…any plans to change this to make the products more accessible to those from other countries? Thank you.

    1. We just updated our shipping making the international shipping more affordable. We are doing the best we can here but until we can obtain a shipping center outside the US there might not be a huge change. I’d check the pricing again, it should be less now. If you order strategically, fewer but larger orders, it should also mitigate cost. Working on it!

      1. Just checked and yes, the shipping costs have indeed gone down to $35…. thank you very much for getting back to me and for accommodating us non-US SIBO sufferer 🙂

  16. Dr. Ruscio,
    If vitamin d can help heal the gut and reduce inflammation then can it help treat and manage autism symptoms since with autism there is a gut and brain connection?

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