Kratom comes from the leaves of a tree that grows in southeast Asia, where it has been used for centuries for its medicinal properties. The leaves are usually ground up to make tea or turned into powder and used in capsules. Most kratom users say the herb has a mild analgesic and stimulative effect, similar to coffee.

In a survey of 6,150 kratom users last year by Pain News Network and the American Kratom Association, most said they used kratom as a treatment for chronic pain, depression or anxiety. But a fair number -- nearly 10 percent -- said the primary reason they used kratom was to treat opioid addiction.

“Kratom is the one thing that has kept me from using opiates and other illegal substances. I've been able to stay clean for 3 years now. It's given me my life back,” one survey respondent wrote.

“Kratom is the only reason I was finally able to end my addiction to hydrocodone. It is nowhere near as potent as hydrocodone, and you can't overdose” said another.

“It has saved my life. I am a mother of four and have anxiety, depression, acute back pain, and I am an opioid addict. It has kept all these at bay for me,” one woman wrote. “I want to be there for my children, but the sad truth is I know I can't live with these conditions and not find something. It's a sad day when I have to turn to the streets again to have any kind of life.”

“I've had several friends who have died from heroin overdose if they knew about kratom they may still be alive today,” wrote another kratom user.

Last year, the Drug Enforcement Administration attempted to list kratom’s two active ingredients as Schedule I controlled substances, which would have made it a felony to possess or sell kratom. The DEA suspended its plan after a public outcry and lobbying campaign by kratom supporters, saying it would wait for a medical evaluation and scheduling recommendation for kratom from the FDA. Although the FDA has warned the public about using kratom, its full report and recommendations have yet to be released.