KRATOM IS NOT AN OPIATE, it is part of the coffee family and it will give you a natural burst of energy. If does hit the opiate receptor though.
Here is a more specific article that I have found
Southeast Asian plant called kratom (Mitragyna speciosa) has provided an attractive alternative. But, acting on anecdotal reports of people becoming dependent on kratom, six states, including Vermont and Indiana, have banned the sale and use of the herb.
The most potent of the related alkaloids was the mitragynine oxidation product 7-hydroxymitragynine. Its MOR potency was one-tenth that of morphine, while mitragynine’s was one-hundredth.
“Mitragynine is not a particularly very potent opioid,” says Dalibor Sames, a chemist at Columbia University who led the team. But, he says, it’s possible that the plant provides a high enough dose of the compound to overcome that
weak potency. “The plant is designed to be a factory for mitragynine,” Sames says. Mitragynine can amount to almost two-thirds of the alkaloid extract from a kratom leaf, adds Andrew C. Kruegel of Columbia, who is the paper’s first author.