API peptides, catalog peptides, and custom peptide synthesis serve different purposes. They differ in standardization, intended use, production scale, and the degree to which the peptide is tailored to a project.
API peptides are pharmaceutically active peptide ingredients used in drug-related settings. They are associated with higher control requirements and application-specific manufacturing expectations.
Catalog peptides are standard sequences produced and offered as established products, often at defined scale and specification.
Custom peptide synthesis is designed around the customer’s requested sequence, modification pattern, purity target, and scale.
In custom synthesis, the sequence, length, modifications, and purity can all be tailored to the customer’s experimental requirements. In contrast, catalog peptides are standardized products, and API peptides are defined by their pharmaceutical role.