A composition is disclosed that comprises a mixture of polypeptides of opposite charge and an excipient selected from the group consisting of arginine, lysine, glutamic acid, sodium dodecyl sulfate, beta-hydroxy cyclodextrin, and beta-cyclodextrin sulfobutyl ether.

 
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> Compositions and methods for enhanced mucosal delivery of Y2 receptor-binding peptides and methods for treating and preventing obesity

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