Mulberry (Morus nigra) is recognized for its nutrient-dense and health benefits. This study aimed to enhance the bioactivities (antioxidant, anti-inflammatory, hypoglycemic) of modified cottage cheese by incorporating mulberry juice and fermenting with Lactiplantibacillus plantarum TAR4 (LAB). Initially, enzyme treatments (pectinase, amylase) on mulberry juice assessed total phenolic content (TPC), flavonoids content (TFC), DPPH activity (DPPH), ferric reducing antioxidant power (FRAP), albumin denaturation inhibition (ADI) and α-amylase inhibition (AI) activities. Optimal mulberry juice, showing highest bioactivities, was added to cheese. Bioactivity stability during simulated in-vitro digestion was tested. Results showed that pectinase-treated mulberry juice had highest DPPH (37.01 ± 0.24%), FRAP (84.38 ± 1.73 mg Fe2+/g dried mulberry), ADI (30.47 ± 0.57%), and AI (71.11 ± 2.55%). Adding 5% (w/w) mulberry juice significantly increased TPC, TFC, ADI, and AI in cheese (p