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It has recently become fashionable for more than 100 people to have undergone the ambitious clinical trial of Ambrosia, a California start-up that offers blood transfusions of adolescents to patients with a Average age of 60 years.

Transfusions are selling for about $ 8,000 per injection, and, according to the US company, can help fight aging.

In the framework of the study of the company, founded last year by the doctor Jesse Karmazin, the patient is injected with two and a half liters of plasma from blood banks, to be able to be a mixture of several teenage donors.

"Plastic surgery of the interior"
Karmazin has been satisfied with the first results of the experiment, pointing out to 'The Sunday Times' that the treatment is "like the plastic surgery of the interior" and affirming that the patients look better "after a single treatment".

According to the doctor, the treatment could help improve "things like the appearance or diabetes or the functioning of the heart or memory," which are "aspects of aging that have a common cause."

"I'm not in a position to say that it will provide us with immortality, but I think it's very close," says Karmazin.

"They are abusing the trust of patients"

However, the revolutionary method has already caused many doubts in the scientific community, which warns that the procedure is not proven and criticizes the experiment for not including a placebo group, as well as for forcing patients to pay for participating in the study. .

In addition, although the study relies on a 2014 research that suggests that the plasma of young mice injected into older mice improves their memory and ability to learn, the author of that study, neuroscientist Tony Wyss-Coray, argues that There is "clinical evidence" that the treatment is beneficial.

"They are basically abusing people's trust and the emotions that this issue arouses," Wyss-Coray told the 'Science' magazine last year.