And a 'clinical trial' where you can try it out for yourself for $8K.
https://ww2.kqed.org/futureofyou/2017/04/10/blood-from-young-people-may-be-a-secret-to-fighting-aging/
" ..... It’s difficult to say whether Ambrosia’s study, as designed, is capable of producing conclusive results. Karmazin is accepting people with a vast range of ages and with different diseases or reasons for wanting the injection. That means the amount of data he gathers on any one condition will likely be limited and may not be useful......."