Supplements are consumed for a variety of reasons. Many active individuals use supplements for a variety of reasons. Muscle gain, strength improvement, prevent future diseases or illnesses and improve performance in sport are some of the main [1, 2]. It has been also shown by a variety of studies that people have a number of different opinions about the usage of supplements [3–12].
Kaufman et al.  found that older people were more likely to take multivitamin and mineral supplements, while younger people were more likely to take creatine. The choice of supplements also depends on the typology of the exercise program  and the type of sport .
In particular regarding supplement consumption in commercial gym users, proteins are the most consumed as shown by Scofield et al. , Morrison et al.  and Bianco et al. [14–16]. As shown by Pechey et al. , socioeconomic status is another factor influencing the quality of food intake, highlighting that low socioeconomic status people usually purchase a greater proportion of unhealthy foods and beverages. Conversely, high socioeconomic status people purchase greater proportions of fibres, proteins and total sugars, and smaller proportions of sodium. Duran et al. also found differences between neighbourhoods in regard the quality of food intake . A restricted number of studies, though, have investigated this specific topic and is not in our knowledge if dietary supplement consumption in particular protein based supplement consumption differs between the city centre (CC) and the suburbs (SB).
The aim of this study, therefore, is to compare the utilization of protein supplements, assess their frequency of use and their consumption in combination with other dietary supplements. Subsequently compare commercial gym adepts from the CC and the SB of Palermo, Italy.