Few studies have been done on the efficacy or safety of kratom. The leaves contain mitragynine and 7-hydroxymitragynine, alkaline compounds that are believed to reduce pain by activating natural opioid receptors in the brain. Researchers have trouble explaining exactly how kratom works without comparing it to other drugs, most of them illegal.

“Mitragyna speciose has a psychostimulant effect like coca and a depressive effect like opium and cannabis, which seem to be contradictory. It is also reported that it is weaker than morphine, has a milder withdrawal syndrome compared to opioids, and is less harmful than cocaine,” is how one study explained it.

An increasing number of pain patients – unable to get opioids or tired of their side-effects – are trying kratom.

“I used to need 1-3 Percocet a day, and now i take ZERO and feel better and have a clear mind,” is how one of our readers put it.

Others have learned kratom is not only useful for pain relief, but reduces their cravings for drugs and alcohol.

“People are so scared of the opioid epidemic right now, which I completely understand, I’m a recovering opioid addict myself,” says Susan Ash, who was diagnosed with late-stage Lyme disease in 2010. She took opioid pain medication for several years, wound up going to rehab, and now takes kratom capsules for pain relief.

“It does activate these opiate receptors, so it is very effective on pain,” says Ash, who founded the American Kratom Association. “The beauty of this plant is that it’s not something someone like me, who struggles with opioid addiction, craves. It’s not something that I take when I don’t need it. It’s not something that ever in my life made me feel impaired. And I’ve been taking this for several years.”

Ash says most members of her association use kratom for pain, depression or anxiety.

“Our numbers increased a lot when hydrocodone scheduling went into place. We got a lot of older women who sought us out, whose doctors cut them off,” said Ash, referring to the DEA’s rescheduling of hydrocodone in October 2014, which made the painkiller harder to obtain. She says the CDC’s new opioid prescribing guidelines are having a similar effect.

“As those restrictions are put in place and more doctors are scared and unwilling to prescribe opioids, the more people we get. There’s definitely a direct correlation,” Ash told Pain News Network.

Kratom is illegal in Vermont, Indiana, Tennessee, Arkansas and Wisconsin. Several other states are weighing similar legislation, including New York.

If past experience is any indicator, outlawing kratom is a whole lot easier than actually controlling it.

Thailand criminalized kratom in 1943 when its popularity interfered with the opium trade, which was then a major source of revenue for the Thai government. Over 70 years later, kratom use is still rampant in much of the country.