A controversial blood circulation machine was delivered to Michael Jackson's (search) Neverland Valley Ranch, a source close to FOX News said.

According to Jackson confidant comedian Dick Gregory (search), the controversial blood machine squeezes the legs and allows the heart to rest for a second or two. Gregory said the machine was invented at Harvard University and is used in Japan, but is prohibited by U.S. hospitals. The machine is not approved by the Food and Drug Administration (search), Gregory said.

The machine was delivered Saturday evening around 6:15 p.m. PST. FOX News has obtained exclusive video of a "Global Cardio Care" van leaving Neverland, escorted by Jackson security around the same time.

A source says a technician and/or nurse came with the machine to hook it up. The machine will remain at Neverland.

Sources close to the Jackson family say that Gregory has taken over oversight of Jackson's medical needs and ordered the circulation machine be delivered to Neverland. The blood machine was part of an overall health program, a source said.

"This is just a part of it. He's getting vitamin nutrients and supplements," the source said.

This source would not elaborate on the type of supplements or the way in which they are being administered.

Last Thursday, Michael Jackson was treated at local hospital after complaining of cold hands, dizziness, fatigue and flu-like symptoms. He received electrolytes through an IV.

This was Jackson's third trip to a hospital since the beginning of his child molestation trial.

In February, the pop star was admitted to the Marion Medical Center in Santa Maria, Calif. where he remained hospitalized with flu-like symptoms, causing a delay in the trial for several days.

On March 10, Jackson briefly visited the Cottage Hospital complaining of back pain. He later arrived at the courthouse clothed in pajamas and wearing slippers.

FOX News' Roger Friedman and MJ Camp contributed to this report.