I wouldn't think that supplements would help you attain a flatter stomach. It's strictly your body fat %.
Do some more cardio, eat right, keep working out your core and stretch. I got a flat stomach doing that.
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Past: '08 E92 335i|ZPP|ZSP|6AT
Past: '15 Mustang GT|401A|PP|6MT
Current: '20 Shelby GT350|6MT
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