Last year Holmes was sentenced to more than 11 years in prison for conning investors and endangering patients while peddling a bogus blood-testing technology.
Disgraced Theranos founder Elizabeth Holmes has begun her prison sentence in Texas.
Holmes, 39, is due to spend the next 11 years behind bars for overseeing an infamous blood-testing hoax.
She entered the federal women’s prison camp located in Bryan, Texas on Tuesday, according to the Federal Bureau of Prisons.
The prison camp is a minimum-security facility that houses about 650 women, considered the lowest security risk.
Prison camps also often have minimal staffing and many of the people incarcerated there work at prison jobs.
Last year, a jury convicted Holmes on four felony counts of fraud and conspiracy. She was sentenced to prison time in November.
Holmes, had been on bail, living in the San Diego area.
She was put under investigation in 2017 for the collapse of Theranos, a start-up she founded after dropping out of Stanford University when she was just 19.
Holmes became a Silicon Valley sensation when she promised that Theranos would revolutionise health care, thanks to a technology that could quickly scan for diseases and other problems with a few drops of blood taken with a finger prick.