Casel was founded by Pharmacist Cahit Selimoğlu in 1983. Pharmacist Cahit Selimoğlu, started his career with Şifa Pharmacy, the second pharmacy in Ağrı, after graduating from Istanbul University Faculty of Pharmacy in 1965. Two years later, he established Derman Pharmacy with his wife, Pharmacist Ülkü Selimoğlu.
He established Huzur Pharmaceutical Warehouse in Istanbul in 1978, engaging in pharmaceutical distribution activities. In 1983, he founded Casel by taking over the drug licenses of a company.
From 1983 to 2001, sales and marketing activities were carried out for pharmacies within the Social Security Hospitals.
In line with developments in the pharmaceutical industry, Casel focused on OTC products and introduced different and innovative products to the market starting from the beginning of 2008 through agreements made within this scope.
Continuing its services in its new management building in Esenyurt since 2009, Casel started the production of food supplements and dermocosmetic products by establishing its own manufacturing facility in 2016.
In 2021, Casel became exclusive distributor of the Breathe Right brand, the global market leader in the nasal strips category, in Turkey. As of 2024, Casel manufactures nearly 300 products in different categories such as dermocosmetics, food supplements, herbal oils, soaps, and shampoos at its own facilities in compliance with global quality standards. Casel products are available under 12 different brands in all pharmacies, chain stores, herbalists, and online marketplaces in Turkey. Casel sells its products to more than 20 countries abroad under its own brands or as private labels.