Longevity clinics for the ultrawealthy can cost $50,000 a week. Here are the world’s top 6 destinations.

Lanserhof Lans, located in the Eastern Alps, is not a longevity clinic for the faint of heart.

The central focus of Lanserhof — launched in 1984 — is “the thorough regeneration of the intestines to revitalize the vital forces,” according to its website. It relies on detoxification, purification, and deacidification programs that draw upon holistic medicine, psychology, and modern medicine to achieve this revitalization.

“The first days here are not easy with the diet — guests can sleep all day or have headaches,” Dr. Katharina Sandtner, Lanserhof’s medical director, told Forbes. “A few days later, energy comes back and this good energy stays with you for a very long time. It’s incredible.”

But the “good energy” comes at a cost. The one-week “Cure Classic” program, the center’s most basic offering, starts at a little above $3,000 a person, excluding accommodations. The program includes numerous medical examinations, a body composition test, urine analysis, therapeutic massages, detox treatments, hydrotherapy treatments, medical lectures, group exercise, and relaxation therapies, according to the Lanserhof Lans program brochure.

The center’s offerings are as extensive as a two-week long-COVID package that’s aimed at guests who are struggling with the effects of COVID. The more than $5,200 package includes seven different medical examinations, respiratory therapies, foot reflexology, altitude training sessions, and group relaxation and exercise sessions to achieve “physical, mental and spiritual regeneration right down to the core,” according to the brochure.

“Minus the hunger headaches, the experience is healing in every sense of the word,” one patient wrote of the Long-COVID treatment program in Allure. Lanserhof Lans didn’t respond to a request for comment from BI.