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What are the active ingredients in phentermine diet pills?

The active ingredient in phentermine diet pills is usually phentermine hydrochloride (phentermine HCl) or phentermine resin. Most brands contain phentermine HCL, but two well-known brands – Ionamin and Duromine – contain phentermine resin. All phentermine pills sold in the United States use phentermine HCL.

phentermine hydrochloride (chemical structure)

Learn more about phentermine weight loss pills here.

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