HONOLULU - Federal health officials are warning the public about a herbal supplement called kratom.

The Centers for Disease Control and Prevention reports that over an 18 month period -- from 27 states -- the supplement was involved in 91 overdose deaths.

Most who died had also taken other drugs like heroin or fentanyl.

Kratom comes from a plant that is native to southeast Asia.

It's sold with claims it will help ease pain, anxiety and drug dependence.