On: CEO who pays millions to feel younger defends accepting plasma from his 17yo Son

Wonder if they are also doing; 'Fecal Microbiota Transplants' : https://en.wikipedia.org/wiki/Fecal_microbiota_transplant

Edit, add;

'Fecal Microbiota Transplants' @google-scholar : <https://scholar.google.com/scholar?as_ylo=2019&q=%27Fecal+Mi...>

To flesh this out a little further;

Blood Type : https://en.wikipedia.org/wiki/Blood_type

Human Blood Group Systems : https://en.wikipedia.org/wiki/Human_blood_group_systems