You’ve been given the diagnosis, but what is hydrogen dominant SIBO? 

I first shared about methane dominant SIBO. But SIBO can be more than methane dominant. There is:

  1. methane
  2. hydrogen
  3. hydrogen sulfide

Anyways, today I want to focus on hydrogen because some of you are dealing with that dominance – and it’s ferocious all the same. 

Hydrogen and Methane Dominant SIBO

The simplest way I have found to describe what is going on is by this easy-to-understand arrow chart extracted from Dr. Amy Myers.

Dr. Amy says, 

Depending on which gas is most predominantly produced, you can develop different symptoms and respond better to different treatments. Hydrogen-dominant SIBO typically leads to diarrhea, whereas methane-dominant SIBO is usually associated with constipation.

So now you can understand why, if you have SIBO, you’re either constipated, have diarrhea or both (both versions – “hi” – me for a very long time).

What is Hydrogen Dominant SIBO

Click HERE to save this post for later.

What is Hydrogen Dominant SIBO #sibo #ibs #guthealth #hydrogen

The best way to describe hydrogen dominant SIBO is to think of it as the first “step” for where things can go wrong. 

When we’re healthy, food is broken down and absorbed through the small intestinal wall. As I’ve mentioned time-and-time again, SIBO is when there is too much bacteria there and/or the wrong bacteria. When that happens, food will ferment before it can be broken down. 

That process creates hydrogen gas as a byproduct, and thus leading to high levels of hydrogen and a positive SIBO breath test indicating hydrogen dominance.

What is Hydrogen Dominant SIBO #SIBO #fodmap #hydrogen

Classic Hydrogen Dominant SIBO Symptoms 

This list is short because, on the whole, SIBO symptoms are fairly similar no matter if you have hydrogen or methane dominant SIBO. 

Number 1 and 2 are unique to hydrogen dominant SIBO.

  1. diarrhea
  2. rotten egg smell
  3. any of these other 8 SIBO Signs and Symptoms

However, hydrogen/methane dominance does not always predict symptoms. Again, this is why we test vs. guess.

Information About Hydrogen Dominant SIBO

Click HERE to save these for later.

  1. The conventional treatment of SIBO is the use of antibiotic pharmaceuticals. The most recent reviews indicate rifaximin as the safest and most effective. Many patients respond to this medication if they are hydrogen dominant. The dose is 550 mg three times daily for 2 weeks. (source)
  2. Hydrogen breath test is useful to diagnose various types of sugar malabsorption. (source)
  3. Hydrogen >= 20ppm rise in ppm in first 90min. (source)
  4. Elevated hydrogen baseline – maybe improper prep, maybe not.
  5. Hydrogen testing results: Very low, or ‘0’ results may indicate Hydrogen Sulfide production, which steals hydrogen from methane producers so both may be low – currently impossible to know for sure; and not known how to specifically treat. (source)
  6. “Technically” there is hydrogen and hydrogen sulfide; they are not the same, different gasses.

Information About Hydrogen Dominant SIBO What is Hydrogen Dominant SIBO #SIBO #fodmap #hydrogen

Hydrogen Sulfide SIBO

To complicate things even more, there is a third type of SIBO, hydrogen sulfide SIBO. But this one is very tricky.

In this case, bacteria called sulfate-reducers feed on hydrogen produced by other bacteria and produce hydrogen sulfide. 

There is no current, standard test for it. Sometimes, you’ll have all the SIBO symptoms and then test negative. And listen up closely –> this could be why your testing is showing a negative; you have hydrogen sulfide SIBO.

Dr. Michael Ruscio briefly explains it here:

Dr. Mark Pimentel stated,

Hydrogen sulfide is the key to unlocking the full potential of breath testing. Looking forward to more data as we charge ahead with a new machine for SIBO testing. It should help clarify many patients with diarrhea.

Hydrogen Breath Test

There are various ways to test for hydrogen-dominant SIBO. 

I’ll make this perfectly clear, though. In my opinion, there is no (current) testing that is 100% accurate.

HERE is a post filled with SIBO testing options.

If you’re interested in learning more about hydrogen via breath testing instantly, check out THIS post on the FoodMarble device. The device allows you to test hydrogen levels at home via a simple breathing device which connects to an app.

Here is my experience using the device.

Hydrogen Dominant SIBO Healing Protocol

I thought about this one for a very long time, and I came to the conclusion that I do not believe there is hydrogen dominant SIBO healing protocol. There are many different ways you could approach it, and many of these ways are the same as the methane producers. 

Research tells us that the biggest difference in treatment between hydrogen and methane is that if the antibiotic route is chosen, hydrogen producers do not benefit from Neomycin, as methane producers can and do.

Healing both my hydrogen and methane dominant SIBO (I suspect the hydrogen sulfide as well) included probably 100 different things. 

Remember, I was first diagnosed with SIBO at the end of 2014.

As of 2021, I have not had a SIBO relapse in almost 3 years. If you want to learn more about how I’ve done it, check out How I Healed SIBO for Good. Or just grab Reasonable SIBO below.

In the meantime, if you want even more, listen to this podcast where Allison Siebecker talks about Hydrogen Sulphide SIBO & Preventing Relapse.

Questions? Leave them in the comments below or contact me.


If you liked this post, you might also enjoy:

  1. How to Do the SIBO Breath Test
  2. SIBO Q&A with A Gutsy Girl
  3. FoodMarble Breath Test {with Aonghus Shortt}


Information about Hydrogen Dominant SIBO what is it A Gutsy Girl #guthealing #healthyliving #SIBO What is Hydrogen Dominant SIBO #sibo #ibs #guthealth #hydrogen vs methane

Similar Posts


  1. Hi, I had a latoslose breath test and positive for hydrogen dominate sibo after having h.pylori. But I’m still experiencing gas and bloating with certain foods and noticeably sugar substitutes mostly on left side (large intestine) how do I know it’s not methane? I wasn’t given a methane test. Not struggling with bowels movements. Unable to retest due to Covid. Most of my symptoms have gotten better but still experiencing gas, bloating. I’m not sure it’s all the way gone.

Leave a Reply

Your email address will not be published. Required fields are marked *