<![CDATA[Cosmetics are materials used on the outside of the body which function to clean, increase attractiveness, change appearance, protect the body and care for the body. Period After Opening (PAO) is the time limit for using skincare that has been opened from the packaging to find out that the skincare is still stable and safe to use. If someone already has a good understanding of information, they will apply it in everyday life. Having good knowledge will be able to take preventive measures well according to the knowledge they have. This research aims to find a relationship related to the Period After Opening (PAO) and skincare storage behavior among UIN Syarif Hidayatullah Jakarta students. This research is a quantitative analytical observational study with a cross-sectional or cross-sectional design, the data used is primary data obtained from questionnaire data collection. The sampling technique used random sampling and based on the Slovin formula, a sample of 727 respondents was obtained. The analysis of the relationship between knowledge and skincare storage behavior using the chi-square test obtained a p-value of 0.001, indicating a significant relationship between knowledge and skincare storage behavior. These results indicate that knowledge plays a significant role in shaping individual behavior in maintaining the quality and safety of skincare products. These findings also indicate that although skincare use is quite high among students, there is still a gap in understanding regarding the product's shelf life after opening and proper storage methods.]]>
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