At Legacy, we recognize that peptides are not small proteins. They have special physicochemical properties that can make them even more demanding to formulate than proteins. In fact, we have written about the specific challenges of peptide formulation. See our articles:

Payne and Manning, Innov. Pharm Technol., Spring 2009, 28: 64-68 and
Ohtake et al., Protein Pept. Lett. 2013, 20: 1308-1323

Legacy has formulated a number of peptides for both parenteral and non-parenteral administration (nasal, pulmonary, topical, oral) administration. In addition to the work we have done for clients, we are about to submit two new manuscripts of formulation development of a peptide for nasal delivery.