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Collagen provides structural support and elasticity, which is essential for proper tissue function

The Los Angeles (LA) classification system, the one most commonly used worldwide, grades esophagitis on a scale from A (least severe) to D (most severe) (Figure 1.11)

Route of Administration How a peptide is delivered dramatically affects how long it stays in the body: Subcutaneous injection : slower absorption, longer duration Intramuscular injection : faster peak concentration, moderate duration Oral and intranasal peptides : often rapidly broken down, requiring protective technologies or higher doses For example, oral BPC-157 may work primarily through gut-localized pathways, while injectable versions may provide broader systemic benefits

FEMS Microbiol Rev