Tim Ferriss
Author and podcaster, The Tim Ferriss Show
Tim Ferriss is an author and early stage investor whose books include The 4-Hour Workweek, The 4-Hour Body and Tools of Titans. He hosts The Tim Ferriss Show, an interview podcast about how high performers work. He has written about testing diets and drugs on himself and has funded psychedelic research at Johns Hopkins and Imperial College London.
Updated November 1, 2026 · 4 experiments
What Tim Ferriss has tried
4 experiments we can source: 2 kept, 2 stopped. Trying something is not recommending it; each entry says which.
Kept
Ketone estersSupplements
Dates not stated · Does not recommend it to others
Has tried ketone monoesters, diesters and salts; likes about 11 ml of monoester but feels tired and anxious at 25 ml or more, found the diester hard on his gut, and uses ketone salts most consistently.
“I do like that. I like the subjective feeling of it, but if that’s only at about 11 milliliters.”
The Tim Ferriss Show #845 transcript, How to use ketosis for mood, cognition and brain protection (January 2026) · Status checked January 7, 2026 · Suggest a correction
PsilocybinDrugs
Dates not stated · Does not recommend it to others
Credits psilocybin, taken with trained facilitators during a silent retreat and in later trauma work, with surfacing and healing memories of childhood abuse; he calls it a lifesaver for him but says he is not recommending it for everyone.
“I’m not recommending these tools for everyone. They do not address everything. They have risks, they have side effects.”
The Tim Ferriss Show #464, My healing journey after childhood abuse (transcript, September 2020) · Status checked September 16, 2020 · Suggest a correction
Stopped
BPC-157 and healing peptidesDrugs
Dates not stated · Does not recommend it to others
Took the BPC-157 and TB-500 stack after elbow surgery and says he has no idea whether it helped, because there was no way to compare.
“Because I took the Wolverine Stack after I had elbow surgery and I’m like, “Did it help?””
The Tim Ferriss Show #876, Dr. Andrew Huberman on peptides, performance and protocols (July 2026) · Status checked July 22, 2026 · Suggest a correction
Ketogenic dietDiets and fasting
Started 2014, stopped 2014 · Recommends it to others
Credits 4 to 6 weeks of strict keto in 2014 with ending his Lyme disease symptoms for good, then went back to slow-carb eating because he did not need to stay on it; he suggests people with Lyme test keto for a few weeks.
“I completely and durably fixed all of my symptoms. It’s been more than a decade, and none of the symptoms have returned.”
Tim Ferriss, How I beat Lyme disease with the ketogenic diet (January 2026) · Status checked January 30, 2026 · Suggest a correction