It’s a green, mean, killing machine.

At least according to Health and Human Services Secretary Robert F. Kennedy Jr., who’s launching a federal crackdown on 7-OH — a synthetic byproduct of the kratom plant .

Sold widely in gas stations, convenience stores, and smoke shops, the opioid-like substance is drawing scrutiny for its potent effects and high risk of abuse. 5

What is kratom?

Kratom is an herbal extract made from the leaves of a Southeast Asian tree called Mitragyna. Users chew the leaves, brew them into tea or take it in powder, capsule or extract form, according to the Mayo Clinic .

“Kratom affects the brain like a stimulant at low doses — boosting energy, focus and mood,” Dr. Joseph Volpicelli , a clinical adviser for Oar Health , told The Post. “Similar to a s

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