Dietary supplements are increasingly recognized as an important source of micronutrients for the population, as many consumers seek alternatives to enhance their dietary intake. Despite their growing popularity, concerns regarding the quality and compliance of these products with labeled contents, critical for ensuring both safety and efficacy, have emerged. This thesis aimed to evaluate the consistency between the declared contents of selected micronutrients (vitamins D3, B12, C, and minerals zinc, calcium, magnesium, and iron) in effervescent tablets and their actual composition, as determined through laboratory analysis. A laboratory analysis and comprehensive review of the packaging was conducted, including an assessment of the ingredients, chemical forms of micronutrients, and the use of nutritional and health claims. Laboratory analyses revealed discrepancies between the micronutrient levels in certain effervescent tablets samples and the declared values, with the most significant deviations observed for vitamin D3, where 24 % of samples fell outside the permissible tolerance. For the recommended intake, most samples met or exceeded 100 % of the recommended daily allowance for the examined micronutrients. A total of 56 (79 %) of the dietary supplements considered were labeled with health claims, while 7 (13 %) samples did not meet the conditions for use of the claims. Most samples declared chemical forms of micronutrients that are authorized for use in dietary supplements, although a minority did not specify the chemical forms of vitamins. The use of sweeteners was prevalent, with 99 % (N = 70) of dietary supplements listing at least one sweetener among the ingredients, predominantly saccharin (79 %). The findings underscore the need for improvements in the labeling and regulatory oversight of dietary supplements.
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