Recent content by Michael Harrop

For that kind of thing, you can search pubmed or google scholar for "[drug name] microbiome". Valtrex is an antiviral, so not something I'd be especially concerned about when it comes to the microbiome.

Virtually everything you're inquiring about is covered in the wiki. FMT is the primary solution. You can use a site like https://examine.com/ to look up evidence for supplements & conditions. This is unlikely to be a solution due to donor quality problems...

https://www.cam.ac.uk/research/news/pesticides-and-other-common-chemical-pollutants-are-toxic-to-our-good-gut-bacteria https://www.nature.com/articles/s41564-025-02182-6

Did you review the FAQ? https://humanmicrobiome.info/faq/

https://www.science.org/content/article/journal-retracts-weed-killer-study-backed-monsanto-citing-serious-ethical-concerns https://www.nytimes.com/2026/01/02/climate/glyphosate-roundup-retracted-study.html https://www.sciencedirect.com/science/article/pii/S0273230099913715

Unfortunately, most people don't seem to see the value in documenting their experiments in a systematic manner that can be found & searched by other people. They just leave random comments here and there.

In my experience, nearly everyone is horrible at judging stool quality, even after training them to identify the best stools, and it being in their interest to do so. I've only come across one other person besides me who seems to be capable of it. So it's either take the photos to show me...

The main issues for me would be that they live in secluded areas, so they're not easy to screen & use. And because of their health issues, and from what video coverage I've seen of them, they don't seem promising enough as donors for me to want to bother with them. However, if someone else...

There is no such thing as an obese, healthy person. https://humanmicrobiome.info/obesity/

Someone posted on the Effective Altruism forums about it, and directly contacted a group of athletes involved with EA. Nothing came of it. I've commented on the EA and LessWrong websites about it, and have had some really poor responses that made me averse to those websites. Eliezer Yudkowsky...

There's a summary here: https://forum.humanmicrobiome.info/threads/the-fda-and-fmt-regulation-part-2-jul-2024-humanmicrobes-org-i-met-wit.520/#post-1370 In the US, an IND is required. Physicians can do single-patient INDs. It is a worldwide project, but I've paused all sales because I was...

Yes, I agree. I think I emailed a doctor he was working with, but I didn't find a contact for him specifically. I also replied to a related tweet he posted. Feel free to write to him. For a "call to action" I generally share this summary of the situation...

https://medicalxpress.com/news/2025-12-fathers-microplastics-exposure-children-metabolic.html https://academic.oup.com/jes/advance-article/doi/10.1210/jendso/bvaf214/8383852

https://www.sciencedaily.com/releases/2025/12/251225080732.htm https://www.nature.com/articles/s41467-025-62397-3

Not for me.