The Microbiome is IN our GutS & Appears to be in our Brains

That has a lot of implications for mental health and Highly individual medication metabolism

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Michael Specter is an American journalist who has been a staff writer, focusing on science and technology, and global public health at The New Yorker since September 1998. He has also written for The Washington Post and The New York Times. ---Wikipedia
Gut Bacteria Interferes with Metabolism of Parkinson’s Drug (June 2019) 
Psychotropics and the Microbiome: a Chamber of Secrets… (Feb. 2019)