Disclosed are compositions-of-matter comprising polymer-mediated cochleates, which are formed from a calcium-free mixture of a wide variety of phospholipids that are atypical for forming cochleates. Further disclosed are compositions-of-matter comprising these cochleates which co-encapsulate another bioactive agent. The polymer mediating the formation of these cochleates exhibits a plurality of positively charged amino acid residues and omega-amino-fatty acid moieties, and may further exhibit antimicrobial, anticancerous and drug-potentiating activity. Further disclosed are pharmaceutical compositions and methods using the compositions-of-matter disclosed herein, and processes of preparing same.