Japan Launches First-Ever Clinical Trial for an Oral ‘Pill’ Gut Microbiome Transplant to Treat Ulcerative Colitis

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Metagen Therapeutics, a venture company launched out of Juntendo University, has begun Japan’s first clinical trial transplanting gut bacteria collected from healthy donors’ stool — encapsulated into an oral “pill” — into patients with ulcerative colitis.

On 5ch, skeptical comments about cost-effectiveness emerged, with users arguing that “other people’s bacteria won’t take hold and will revert over time” and that “maintaining it costs millions of yen a year, making it impractical.” At the same time, the discussion expanded to cover the link between gut flora and autism, and how everyday diet affects the gut environment.

Gut Bacteria Transplant via “Oral Pill” — Clinical Trial Begins, a Japan First, Targeting Ulcerative Colitis Patients: “Donated Stool” Turned Into Capsule Formulation by Juntendo-Affiliated Venture

A joint Japan-US clinical trial has begun to test whether gut bacteria collected from the stool of healthy Japanese donors, administered to ulcerative colitis patients via an oral “pill,” can improve the gut environment and symptoms.

This is Japan’s first such attempt. The oral pill is a capsule formulation developed by Metagen Therapeutics (Tsuruoka City, Yamagata Prefecture), a drug-discovery venture spun out of academia including Juntendo University.

Source: yomiuri.co.jp / Original article here

2Anonymous2026/08/20(木) 23:50:52.11ID:SelAMwdu
Make sure it's from a cute girl, please (lol)
4Anonymous2026/08/21(金) 00:45:25.73ID:X7IFPDZG
Juntendo University keeps developing groundbreaking treatments for UC, but every single one ends up being a treatment only rich people can afford.
No matter what Juntendo develops, it brings zero benefit to the huge number of ordinary UC patients out there.
5Anonymous2026/08/21(金) 01:06:52.23ID:StFlUTdp
Poop capsules (lol)
6Anonymous2026/08/21(金) 01:07:08.61ID:u6MOn2A3
Well, if it's the direct-transfer method…

> The response rate for symptom improvement reached 70.3%, remission induction rate 45.9%, no serious adverse events observed, safety confirmed

that's why.

Gut bacteria genes and their metabolites are needed for the human body to function properly, so there should be some baseline effect.

But the solution depends on where the root of the problem actually lies.
If the immune cells running wild in the gut are caused by a lack of gut bacteria metabolites, this method should work.

But if the type where the gut is contaminated with microplastics and constantly inflamed is the cause, then bacteria that actually eat and neutralize microplastics could be a more direct solution.
Though we'd need to verify whether it's even safe to put something like that in your stomach.

But maybe healthy people's guts actually already have those kinds of modern-adapted bacteria.
7Anonymous2026/08/21(金) 01:11:48.38ID:u6MOn2A3
But honestly, even if you do this, if you're not regularly eating proper vegetables, fruit, and healthy salt and oil, your gut bacteria will just end up ravaged again — without that, the effect won't last.

But flip that around: if you're already doing something like a Mediterranean diet regularly, your gut environment naturally improves on its own.

Though once things are already thoroughly broken down and constantly inflamed, the barrier is wrecked no matter what you eat, so everything ends up too irritating.
8Anonymous2026/08/21(金) 01:13:15.17ID:u6MOn2A3
These days Japanese food, emulsifiers included, is basically all stuff that destroys the gut barrier.
It breaks the barrier, microplastics and the like get in, and the immune cells can never quite fix it — it's an endless loop.
9Anonymous2026/08/21(金) 01:40:45.43ID:P/oj9bRf
I think this was originally meant for treating autism, wasn't it?
The relationship between autism spectrum disorder (ASD) and gut bacteria still isn't well understood.
10Anonymous2026/08/21(金) 01:41:55.53ID:P/oj9bRf
>>9
Don't know if it's true or not,
but if this turns autistic kids who can only babble "ah" and "uh" into functioning normally, that'd be a real find.
11Anonymous2026/08/21(金) 01:45:46.23ID:ve7E7jyp
Forget that, what about a cure for baldness?
12Anonymous2026/08/21(金) 02:40:09.49ID:X7IFPDZG
With the method of introducing someone else's bacteria to change the patient's microbiome, the bacteria don't actually take hold.
Over time it reverts back.
To stop it from reverting you'd have to keep introducing donor bacteria regularly, which costs millions of yen a year.
It's just not practical.
14Anonymous2026/08/21(金) 04:59:36.63ID:r22y0/m0
We've already got Biofermin (a popular Japanese probiotic supplement)
17Anonymous2026/08/21(金) 06:21:08.75ID:WVHQoSFm
>>14
Yeah, but this drug is marketed as human-derived.
26Anonymous2026/08/21(金) 11:55:10.11ID:rnPX2LvH
Wouldn't an enema work just as well? Drinking it seems like a bit much.
28Anonymous2026/08/21(金) 12:11:57.99ID:6eGlf7J/
>>26
With an enema it'll all just come back out afterward — make it a suppository instead.
27Anonymous2026/08/21(金) 12:07:16.95ID:bgPcsx9h
Are coprophagists (people who eat feces) healthy?
29Anonymous2026/08/21(金) 12:17:28.41ID:b663BLpB
What if you accidentally bite into it…
30Anonymous2026/08/21(金) 14:09:15.67ID:CkJf3kPM
>>29
> Gut bacteria extracted from stool are processed into powder form using a freeze-drying method
So it sounds like it's not literally feces itself,
but I doubt it'll taste like chewing up a Biofermin tablet.
32Anonymous2026/08/21(金) 16:23:10.34ID:+q8E18t/
Even Yakult's Lactobacillus casei Shirota strain was originally isolated from a human gut — why act surprised now???

>>30
Same goes for Biofermin, honestly…
31Anonymous2026/08/21(金) 14:37:42.84ID:Q9irnSGl
Maybe they should include a "grown by me" photo like they do with produce lol
33Anonymous2026/08/21(金) 16:29:22.87ID:WVHQoSFm
>>32
Yeah, this drug is marketed as human-derived — as opposed to Biofermin.
34Anonymous2026/08/21(金) 17:03:05.06ID:AU0LuLp7
Antivenom serum for venomous snake bites is horse-derived, some cardiac drugs use cow-derived components…
there are all kinds of human- and animal-derived medicines out there.
35Anonymous2026/08/21(金) 19:50:11.68ID:v6qj9rzY
My stomach's always rumbling, I want a poop transplant too
40Anonymous2026/08/23(日) 00:21:35.73ID:SE4+j7B3
Please add irritable bowel syndrome (IBS) to the list of targets eventually too
41Anonymous2026/08/23(日) 02:13:01.50ID:WWS/xdAF
For people with IBS, building a daily hot-bath habit will get you better results faster than trying to fix your gut environment.
42Anonymous2026/08/23(日) 02:52:12.81ID:N1qYx2zI
This feels kind of behind the times to me.


I just eat Biofermin and Joa yogurt (a Japanese probiotic yogurt brand).

*This article is compiled from excerpts and a summary of the 5ch (Science News+) thread “Gut Bacteria Transplant via “Oral Pill” — Clinical Trial Begins, a Japan First, Targeting Ulcerative Colitis Patients: “Donated Stool” Turned Into Capsule Formulation by Juntendo-Affiliated Venture.”

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