Sales and usage of dietary supplements have significantly risen in recent years, bringing along various health risks such as liver damage and adverse effects on cardiovascular health. In Sweden, dietary supplements are classified as regular foods under Swedish law and are subject to monitoring by local municipalities. This study aimed to examine how Swedish municipalities oversee the regulation of dietary supplements, while also investigating differences between larger and smaller municipalities. Data were collected through a web-based questionnaire comprising nineteen questions. The questionary covered topics including general supervision practices, inspection frequency at facilities, and knowledge levels concerning different dietary supplement products. The questionary achieved a response rate of 56% (163 out of 290). Among the respondents, 95% were involved in the supervision of dietary supplements, 80% had established plans, and 67% had implemented specific policies. A majority of the stores were inspected every three years, with some receiving annual inspections. Respondents' overall knowledge level was considered moderate, with significant disparities between larger and smaller municipalities. While most municipalities are actively engaged in regulating dietary supplements, there are still certain deficiencies in their management practices. The inspection frequency of most municipalities inspected facilities based on the Swedish Food Agency's risk classification model. Knowledge levels regarding dietary supplements among municipalities are generally satisfactory, though notable discrepancies exist between large, medium-sized, and small municipalities.