Investigation of caffeine concentrations in sport supplements and inconsistencies in product labelling

Abstract

Abstract: Caffeine is a substance that can be easily consumed in daily nutrition as well as in sportsupplements. Exceeding the daily-recommended dose for caffeine may cause serious health problems.Studies illustrated that many concerns have been raising about the incompatibility between labels onsport supplements and their contents. The present study aimed to investigate caffeine contents in sportsupplements purchased from Turkey market for the first time and to evaluate label information onproducts. Caffeine concentrations were determined in 41 sport supplements and possible adverse effectswere emphasized considering calculated daily consumption doses. Seventeen samples among 41products were found to be caffeine containing, ranging from 4.52 to 471 mg/mL. Three of caffeinecontaining products were undeclared their caffeine ingredients. Although three products were notspecified caffeine their amounts, findings were found above the daily-recommended caffeine limit (400mg/day). Significant differences were observed between the quantities indicated on the labels and thedetermined caffeine amounts in 7 products (p