Young blood transfusion

 Young blood transfusion refers to transfusing blood specifically from a young person into an older one with the intention of creating a health benefit. The scientific community currently views the practice as essentially pseudoscientific, with comparisons to snake oil.

 There are also concerns of harm. The U.S. Food and Drug Administration, in 2019, cautioned "consumers against receiving young donor plasma infusions" stating that they are an "unproven treatment".

Experiments beginning in the 1950s in the Cornell University lab of Clive McCay on pairs of old and young rodents placed into parabiosis provided some evidence, albeit limited and "largely anecdotal", that the circulation of blood from young mice increased both the longevity and the tissue function of old mice.