Advocates for kratom tout the popular herbal substance grown mainly in Southeast Asia as great for treating chronic pain, anxiety and heroin addiction, among many other uses, and decry Denver Environmental Health's decision to ban it for human consumption last November. But University of Colorado professor and pharmacologist Robert Valuck thinks such a prohibition makes sense even if kratom has medical value. "I'm not saying kratom doesn't work," Valuck stresses. "I'm saying we don't know if it works or what the proof is."
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