Ib khob ntawm kas fes tam sim muaj ntawm 30 thiab 90 milligrams ntawm caffeine piv rau kas fes tsis tu ncua, uas muaj ntawm 70 txog 140 mg. Qhov muaj peev xwm poob qis ntawm kas fes sai yog cov tshuaj muaj pes tsawg leeg. Nws muaj acrylamide, muaj peev xwm ua rau muaj tshuaj lom uas tsim thaum kas fes taum tau ci.

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