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Eucheuma cottoni is one of the most utilized marine commodities for carrageenan production. Carrageenan can be utilize for probiotics production. This study aimed to obtain bacterial growth media with the highest probiotic activity before and after drying. The study consisted of several stages, namely: pre-hydrolysis, hydrolysis with inactive enzymes, chemical and microbiological characterization, drying with spray drying, and BAL viability test. From the results of the study concluded that the untreated sample had the best results compared to filtering and precipitation samples. The untreated sample had reduced sugar content of 0.35%, total sugar 2.81%, pH 5.37, total acid 0.147%, and total LAB of 8.2x108 CFU/ml. After drying with spray drying, the BAL viability reduced to 9.7x106 CFU/ml.