Lactoferrin (LF) and β-lactoglobulin (BLG) co-assemble in the presence or absence of vitamin B9.
Following B9/(BLG + LF) molar ratio, aggregates or heteroperotein coacervates were formed.
Heteroprotein coacervates were effective in encapsulating B9.
B9-LF-BLG coacervates are an efficient biocarrier with entrapment of 10–12 mg B9/g proteins.