An herbal supplement billed as a "feel-good tonic" is sparking concerns about potentially dangerous health effects.

Some users claim that Feel Free, a plant-based product made by Botanic Tonics in Oklahoma, is highly addictive .

The tonic, which is also available in capsule form, is sold at many gas stations and retailers across the U.S.

Its ingredients include kava extract, which the company says promotes relaxation and lifts mood, and kratom leaf, which is said to enhance energy and focus.

Users on Reddit have warned of Feel Free’s addictive properties , also sharing experiences that include skin infections, seizures, suicidal ideations, hospitalizations and intense withdrawal symptoms.

‘Last frontier of addiction’

Chris Oflyng, 28, from Madison, Wisconsin, shared his exper

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