In recent years, public awareness of the importance of understanding food ingredients and their production processes has increased significantly. This increased awareness is reflected in the growing interest among consumers in understanding the composition and origin of the products they buy. This study aims to analyze the effect of knowledge about food ingredients and production processes on purchasing decisions of students at Darussalam Gontor University. The theories used in this study are the theory of purchasing decisions and the theory of consumer behavior. Using a quantitative research approach, this study examines three independent variables: knowledge of ingredients, knowledge of the production process, and the combined effect of both on purchasing decisions of students at Darussalam Gontor University. The large population in this study was 5782 students who were then determined using Cluster Random sampling, Purposive Random Sampling so that the results of the small population were 643 students, the sample of this study was 90 students who were determined using Simple Random Sampling. The results of this study were obtained from the analysis using SPSS Version 25 which showed that: 1) Knowledge of food ingredients does not have a significant effect on purchasing decisions, with a sig value of 0.119 and a t-count value of 1.574. This shows that students of Darussalam Gontor University do not pay much attention to the composition of food ingredients listed when buying food products, because there is already a sorting of ingredients that enter the university environment. 2) Knowledge of the production process has a positive and significant impact on purchasing decisions, with a sig value of 0.000 and a calculated t value of 5.469. This shows that students of Darussalam Gontor University pay more attention to the production process carried out by the seller before buying food products. 3) Both variables together have a significant effect on purchasing decisions, with a calculated f value of 165.214 and a significance value of 0.000. This shows that students of Darussalam Gontor University pay more attention to food ingredients and the production process before buying food products.