Abstract Background: The purpose of this research was to evaluate whether internal control helps the supply of medicines in the pharmacy area of the Zarate health center in 2021. Methods: The research method was deductive and descriptive-observational. The approach was qualitative, as the analysis was observational based on documentary analysis. It was an applied, non-experimental, cross-sectional design. The population and sample were the documentation of internal control and medicine supply in the pharmacy area of the Zarate health center in 2021. Due to the nature of the research, a checklist was used as a data collection instrument, which was used to collect all the information from the documentation available at the study site. Results: As main results, it was found that the evaluation of internal control obtained a score of 63 out of 66 possible points, with 95.5% compliance, and the supply variable obtained a score of 37 out of 42 possible points, with 88.1% compliance. Conclusion: It was found that internal control affects and helps the supply of medicines in the pharmacy area of the Zarate health center in 2021. Keywords: Internal control, supply, medicines, pharmacy, health center, logistic, control. Abstract Background: The purpose of this research was to evaluate whether internal control helps the supply of medicines in the pharmacy area of the Zarate health center in 2021. Methods: The research method was deductive and descriptive-observational. The approach was qualitative, as the analysis was observational based on documentary analysis. It was an applied, non-experimental, cross-sectional design. The population and sample were the documentation of internal control and medicine supply in the pharmacy area of the Zarate health center in 2021. Due to the nature of the research, a checklist was used as a data collection instrument, which was used to collect all the information from the documentation available at the study site. Results: As main results, it was found that the evaluation of internal control obtained a score of 63 out of 66 possible points, with 95.5% compliance, and the supply variable obtained a score of 37 out of 42 possible points, with 88.1% compliance. Conclusion: It was found that internal control affects and helps the supply of medicines in the pharmacy area of the Zarate health center in 2021. Keywords: Internal control, supply, medicines, pharmacy, health center, logistic, control. Abstract Background: The purpose of this research was to evaluate whether internal control helps the supply of medicines in the pharmacy area of the Zarate health center in 2021. Methods: The research method was deductive and descriptive-observational. The approach was qualitative, as the analysis was observational based on documentary analysis. It was an applied, non-experimental, cross-sectional design. The population and sample were the documentation of internal control and medicine supply in the pharmacy area of the Zarate health center in 2021. Due to the nature of the research, a checklist was used as a data collection instrument, which was used to collect all the information from the documentation available at the study site. Results: As main results, it was found that the evaluation of internal control obtained a score of 63 out of 66 possible points, with 95.5% compliance, and the supply variable obtained a score of 37 out of 42 possible points, with 88.1% compliance. Conclusion: It was found that internal control affects and helps the supply of medicines in the pharmacy area of the Zarate health center in 2021.