Analysis of Vitamin C Levels and Evaluation of Effervescent Tablets Mixture of Ethanol Extract of Red Guava Seeds and White Guava Seeds (Psidium Guajava L.). jisk [Internet]. 2022 Apr. 30 [cited 2024 Nov. 21];3(1):1-7. Available from: https://ejournal.sumateraconnect.or.id/index.php/jisk/article/view/26