He obviously doesn't talk about it because it's super weird and vampire like, but Inc. did an interesting story about it last spring. I don't know that there's proof that he's doing it per se, but strong evidence in that direction. The evidence:
1. There's a pharma / plasma company in Monterey named Ambrosia. [1]
2. Ambrosia is running a study titled "Young Donor Plasma Transfusion and Age-Related Biomarkers" [2]
3. This study is patient funded, participants volunteered and pay $8k to recevie regular infusions of plasma from donors <25 years old.
4. Ambrosia didn't advertise or fundraise beyond seeking patients.
5. Ambrosia's CEO received a call from Jason Camm, an 'Angel Investor' at Thiel Capital who was interested in learning about what the company was doing.
6. Jason Camm isn't actually an investor, he's Peter Thiel's "Personal Health Director". His professional profile claims that he "Enables his clients to make radical breakthroughs in their immediate day-to-day health, cognitive functioning and physical performance -- all of which increase their prospects for Optimal Health and significant Lifespan Extension."
7. A year before the Inc. article, Thiel brought up parabiosis unprompted to a journalist but didn't think there was much of a business case for it, just a personal-health impact.
