I’VE BEEN WRITING ABOUT THIS FOR A WHILE: The Next Health Fad? Blood Transfusions from Young People. “Ambrosia is planning on giving 600 patients four rounds of weekly blood infusions coming from 16- to 25-year-olds. Ambrosia founder Jesse Karmazin, who went to Stanford Medical School, said in an e-mail that he was inundated with interview requests and unable to speak today. . . . Another company called Alkahest has been conducting a clinical trial with young blood infused into patients with probable Alzheimer’s. Its results are expected out by the end of the year.”