Protein bars are one of the first protein-enriched products. Due to the development of the market and the different requirements of consumers, the number of bars with various additives additional ingredients is growing. Variability of nutritional declarations was checked on 71 protein bars with the addition of chocolate on the Croatian market. Data were collected from five websites and at four shopping centers in the city of Karlovac, in April of 2021. Consumer habits, attitudes and knowledge about chocolate protein bars were examined with an online questionnaire (Google form) from 10 June to 1 July 2021 on a sample of 317 respondents from the territory of the Republic of Croatia. Chocolate protein bars differ the least in energy value (coefficient of variation (CV) 14 %), and the most in sugar content (CV 102 %). The protein content ranges from 12.0 to 59.9 %, and the average chocolate protein bar on the Croatian market contains about 18 g of protein and meets about 26 % of the recommended daily protein intake. Around 60 % of respondents always or sometimes pay attention to the protein content when buying protein-enriched food. About 66 % of respondents believe that the protein content in chocolate protein bars is lower than the real one and about 67 % of respondents think that consuming the average chocolate bar satisfies almost twice as less of the recommended daily protein intake than the real one. About 20 % of frequent and occasional consumers of protein-fortified products believe that a balanced diet cannot ensure sufficient protein intake. The most common sources of protein in chocolate protein bars are milk proteins (in 80 % of products), soy proteins (in 68 % of products) and hydrolysed collagen (in 49 % of products). The data on the type of protein added to the product is significantly less interesting for the respondents than the data on the protein content. Nonetheless, type of protein is the least interesting information among energy value, sugar content, sugar substitutes and fiber content. Fibers are contained in 72 % of products (most often polydextrose and oligosaccharides), while sweeteners in 73 % of products (most often maltitol and sucralose). From 10 % to 34 % of respondents recognize individual fibers and sweeteners from the list of ingredients. Most respondents partially agree with the proposed approved health claims for protein, indicating insufficient information about the effects of protein, regardless of the frequency of consumption of protein-fortified products or the level of effort invested in maintaining and improving health.