Comparative Analysis of Free Formaldehyde Determination Methods in Acne Treatment Product Samples: Perbandingan Metode Pengujian Formaldehida Bebas pada Sampel Produk Anti jerawat. Pharmasci [Internet]. 2026 Jul. 22 [cited 2026 Sep. 22];11(2):307-22. Available from: https://e-journal.akfarsurabaya.ac.id/index.php/jps/article/view/598