Being a donor for Fecal Microbiota Transplants (FMT): Do good & earn easy money (up to 180k/​y)

Link post


Help to find super donors for Fecal Microbiota Transplants (FMT)! By donating stool for FMT, exceptionally healthy people can earn $180,000/​yr with little effort. Simultaneously they can help chronically ill people improve their health with a novel treatment. Apply here.

More detailed summary

Fecal Microbiota Transplants (FMTs) is a procedure that transfers the stool of healthy people to the guts of sick people. The mechanism is to replace a dysbiotic gut microbiome with an eubiotic, disease-resistant gut microbiome.

So far, FMT has only been proven to be very effective in curing patients of C. difficile infections. However, since the gut microbiome impacts and regulates virtually every aspect of human health, function, and development, FMT is a promising treatment for a very wide range of chronic and acute health conditions[1][2].

FMTs can easily & safely be done at home, both for the donor and the recipient—no doctor needed.

A super-donor is a person who yields outstanding positive effects as a stool donor. Only exceptionally healthy & fit people are super-donors. They are very rare and a few people within the FMT movement have been searching for them for years. Most donors, even reasonable healthy ones, only yield modest benefits.

Human Microbes, an organization specialized in finding super-donors and connecting them with recipients, is paying super-donors $500 per stool. This adds up to $180,000/​yr if donating a daily stool!

Purpose of this post

  • Spread the news that this opportunity for super donors exists: With little effort, they can help lots of ill people (“make them more effective”) while earning $500/​stool. You should check whether you are a super donor. If you know someone who might be, please share this post with them.

  • Give a rough introduction to FMTs & Human Microbes, with the aim to start a rational discussion about FMT’s benefits. FMTs look very promising, but there is by no means a clear scientific consensus. I’d love for more EAs to look into this, to get more certainty about its efficacy!

  • If your health is suboptimal, maybe you could consider using FMTs. Not just for obviously gut health-related issues, but much more broadly than you might think. Potentially even e.g. unspecified subclinical low energy, low mood, or mental sluggishness.

  • At the end, this post provides you with a long list of useful further links on FMTs, the microbiome and its connection to a vast amount of (mental-) health conditions. This is to help you do your own research, both as a potential super donor or as someone who might benefit from FMTs.

  • Finally, this post is also a shameless attempt to find FMT donors for me to treat my severely limiting gut issues. Please contact me at anton.rodenhauser[at] .

Who might be a super donor?

  • Donors must be in exceptional physical and mental health. Ideally, top young athletes. Though there are non-athletes who qualify as well.

  • Ideally, donors would be under 30 years old. Donors can be under 18 provided they have signed consent from their parents. Many children need FMT and are ideally matched with young donors.

  • Donors should have minimal antibiotic use.

  • Donors should have a “Type 3 stool” as a Bristol Stool Type.

Check out the links at the end of this post for more information and sources.

As you can imagine, super donors are very rare and thus very high in demand. In fact, Human Microbes has screened over 25,000 donor applicants so far, including hundreds of college and professional athletes, and still hasn’t found that one “perfect” super donor that fully satisfies all their donor criteria! So please reach out to Human Microbes about potential super donor candidates!!

How much good can you do by finding a super donor?

Know an EA whose gut-borne suboptimal health is holding them back from doing the most good they can do? Find them a super donor, or be a super donor for them!

In recent decades, chronic disease has been dramatically rising all over the world. Depending on what standard for “healthy” you choose, the vast majority of people are now significantly unhealthy – both physically and mentally – and the problem continues to worsen.

It is postulated that the gut microbiome plays a major role in this phenomenon – through widespread overuse of antibiotics, c-sections, lack of breastfeeding, and suboptimal diets. And the damage we’re doing accumulates over generations.

Our host-native gut microbiomes have been evolving alongside us for millions of years. If we lose them, we may never get them back.

Since the gut microbiome has been shown to impact and regulate virtually every aspect of human health, development, and function, a super-donor may be able to cure numerous acute and chronic illnesses—including many with no obvious gut connection at all.

Beyond that, FMTs from super donors are promising to make people more than “merely not sick”. They can plausibly/​probably make many people more energetic and improve their mental health, sleep, and cognitive functioning. There might even be some longevity benefits to doing FMTs from young donors! You could arguably think of FMTs as a form of “biohacking” for optimal performance/​health. Check out the “Links to do your own research” section at the end!

I can picture a future where we identify one super donor among EAs, and then provide FMTs for all EAs who suffer from low mood, anxiety, low energy, some chronic health condition, etc. Imagine the impact of that super donor EA!

About Human Microbes & Michael Harrop

Human Microbes was started up in 2020 by Michael Harrop in response to the lack of high-quality donors available at other sources – worldwide clinics, hospitals, stool banks, clinical trials, etc. Almost all of the latter ones focus mainly on acute safety, aka “the donor must not have any obvious diseases or illness so he can’t infect or otherwise harm you”. Instead, Human Microbes emphasizes “you don’t want a merely not sick donor—you want a maximally healthy, extraordinarily well-functioning donor—after all, that’s what YOU want to become yourself.”

Virtually all studies use “merely not sick” donors, resulting in poor clinical trial results and putting patients at risk. According to Michael Harrop, this is why FMTs have not yet been recognized by the scientific community as the miracle cure that they might well be. See “Links to do your own research” section.

Harrop still runs Human Microbes alone. From my heuristics and in my experience (ordering stools, having several calls with him, getting help for this article), he is trustworthy and focuses on the science part of things instead of the business part. He writes (and I’m inclined to believe him) that “While many other operations have a primary financial motivation, our motivation is fixing people and fixing society. We aim to find the fewer than 0.1% of people who qualify, and connect them with doctors, researchers, hospitals, clinical trials, and individuals.” I’m a bit less certain about his epistemic standards & humility. Reading his (Maximilian Kohler is his alias), I get the feeling that he is extraordinarily knowledgeable on the topic and really cares for the science, but he may be a bit too excited about FMTs at times. There is an AMA with him in the comments!

Why aren’t scientists more excited about FMTs?

To be clear, many scientists are very excited about FMTs. It’s an active area of research. Still, one has to ask: Why are results in FMT studies often mixed? Why do many reports state FMTs don’t work? Why so much poor anecdotal evidence?

Answer (according to Michael Harrop): Virtually all FMT studies have one of the following major flaws:

  1. Poor donor quality. Donors should be under 30, have very limited lifetime antibiotic exposure (ideally none), athletic & low body fat, and good mental health. Firm stool consistency seems important too. Typical donor criteria you see are severely deficient. Stuff like “no antibiotics in the past 3 months, 18-50 yrs old, no pathogens in stool & blood test”.

  2. Insufficient treatment length. Many studies only do a single infusion, but for many people/​conditions you might need to do it daily for 2+ months (Eg: ASU autism study).

  3. Too much oxygen exposure. Blending is quite common and this oxygenates the stool sample, killing anaerobes, and thus very likely reducing efficacy.

  4. Colon-only procedures. The small intestine is very important, so completely ignoring it is a likely flaw for some conditions.

The above is mostly copied from here (link provides lots of evidence for above claims).

Judging by donor criteria, some of the best FMT studies are coming from a Danish hospital. They made great efforts to find a super-donor. Out of 700 applicants, they only accepted the top 4 “healthiest” ones. They did get better results for C. difficile, i.e. a 100% cure rate, vs the usual 80-90%, yet failed for IBS and UC. Here is a nice article about it. However, Human Microbes was in contact with the top donor mentioned in the article, and not even their donors passed Human Microbes’ criteria. Thus it is not surprising (according to Human Microbes) that their studies for IBS and UC failed.

The hypothesis (yet to be tested, but strongly implied) is that FMTs with stools from exceptionally healthy donors, according to Human Microbes’ even stricter criteria, combined with using only “correct” procedures (see above), would show much better results than the above or any other existing study out there.

Effective Entrepreneurship opportunity

I believe that Human Microbes is a great effective entrepreneurship opportunity. Michael Harrop would be more than glad to have some savvy EA business people take over his Human Microbes, which is more like an “amateur project” at this point. He has written to me: “I have no knowledge, interest, or expertise in running a business. My own poor health is typically very limiting. I didn’t start out with the intention to create a business. But I think it will need to go in that direction. And I would love it if I could find someone able to do a good job at it. My expertise is knowledge & understanding of human health, development, and function, and the gut microbiome & FMT, and thus screening & selecting stool donors.

He also told me he’d be passionate about people helping him do proper scientific studies with very high-quality super donors—something that has apparently not been done so far. At the very minimum, he’d like to do some citizen science with the help of some proper data scientists/​study design experts.

I’ll write a separate blog post about the “effective entrepreneurship” side of FMTs.


I am an EA who has benefited from FMTs with stools ordered from Human Microbes. Now I’m writing this blog post to help the cause of FMTs. I strongly want to encourage anyone with super donor potential or who knows someone like that to contact Human Microbes.

Also, my own health is still quite bad, so I would be extremely grateful for any potential super donors to reach out to me as well.

Aella did FMT with (I think) Nate Soares as her donor. Nate certainly looks like a super donor to me—someone please tell him about this post!

Michael Harrop’s vision is to identify a 1010 super donor and, via FMT, use their stool to help upgrade the stool of ‘very good’ donors to a 1010 as well. This should help to scale and trickle down the superior health benefits to other people. He says it is plausible but not certain that this will work.

Questions? AMA with Michael Harrop in the comments!

I’ve arranged for Human Microbes’ Michael Harrop to hang around in the comments. Feel free to ask him any questions! Even if your question feels dumb, or if you haven’t read this full post. Michael Harrop is extraordinarily knowledgeable about this topic! I’d be especially curious about your reasons for being skeptical, for “not buying into this”, or for not trusting Human Microbes/​Michael Harrop. If your health is suboptimal, what stops you from trying FMTs as a treatment?

Links to do your own research


PubMed: “Fecal Microbiota Transplantation: Current Applications, Effectiveness, and Future Perspectives”:


PubMed: “Fecal microbiota transplantation broadening its application beyond intestinal disorders”:


Review article: ”The Super-Donor Phenomenon in Fecal Microbiota Transplantation”:


Scientific article on the “microbiome crisis & endemic suboptimal health”:


“Preserving microbial diversity: “the loss of our ancestral microbial heritage, to which we were exposed through millions of years of evolution, may be the driving force behind the dramatic increase of chronic disease”


Diet-induced extinction in the gut microbiota compounds over generations


On the same topic:


Article in “Frontiers in Microbiology”:

“It is now clear that the gut microbiota contributes significantly to the traits of humans as much as our genes, especially in the case of atherosclerosis, hypertension, obesity, diabetes, metabolic syndrome, inflammatory bowel disease (IBD), gastrointestinal tract malignancies, hepatic encephalopathy, allergies, behavior, intelligence, autism, neurological diseases, and psychological diseases. It has also been found that alteration of the composition of the gut microbiota in its host affects the behavior, intelligence, mood, autism, psychology, and migraines of its host through the gut-brain axis.” (2018): https://​​​​articles/​​10.3389/​​fmicb.2018.01510/​​full

Keep in mind that a common theme is the lack of high quality donors being used in most studies, due to the difficulty of finding such people. So we should see dramatically better results once we do find people who meet the ideal criteria.

Diet-induced extinction in the gut microbiota compounds over generations:


Nice informational website:


by Michael Harrop

Michael Harrop’s in-depth FMT explainer (Maximilian Kohler is his alias): procedure, benefits, science/​epistemic status, donor screening, etc.:


Michael Harrop: scientific review on numerous health conditions that have a connection with the microbiome and can thus potentially/​probably be cured with FMTs. Highly recommended!


How well do FMTs work? What evidence do we have?


One issue is that since C. Diff has proven relatively easy to treat with only 1-2 FMTs, that has been the most common approach for other conditions as well. But for harder-to-treat conditions (most of them) we’ll likely need many more FMTs, as well as higher quality donors.

Michael Harrop explains “Where are Human Microbes super donor criteria coming from”:


Harrop also writes a lot about gut health and other FMT adjacent topics on his http://​​

FMTs for anti-aging, mood, sleep, brain function, and other “hot” topics

FMTs, Microbiome & (Anti-) Aging: Forget young blood, you want young poop!


Microbiome and depression & anxiety: Is a suboptimal microbiome making you unhappy and could FMTs change that?


Microbiome & sleep:


Microbiome & brain function:


about Human Microbes

Human Microbes’ website:


Here is the $500/​stool offer & procedure:


FMT super donor criteria & screening questionnaire: