Is it wrong for old people to receive blood infusions from teenagers?

Parabiosis, a nascent and unproven medical procedure that involves transfusing the blood of young people into the bodies of older people, is in the news once again.

CNBC reports that for $8,000, a startup called Ambrosia will transfuse blood from donors under the age of 25 to buyers over the age of 35.

And once again, folks are reacting with astounding contempt. You can take a look at the outrage here. In a nutshell: This is exploitation. This is vampirism. This is a profound misuse of money. This is where capitalism takes us.

We don’t yet know if parabiosis reverses or even slows aging. Reason’s Ron Bailey has chronicled the practice since it first popped up on his life-extension radar, after studies found that connecting the circulatory system of a young mouse to that of an old mouse “stimulates the worn-out stem cells in old mice to start proliferating again to repair damaged tissues.” (Researchers are also studying the effects of umbilical cord blood plasma as a substitute for the blood of 20-somethings.)