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It upregulates vascular endothelial growth factor (VEGF) and fibroblast growth factor (FGF), stimulates angiogenesis to improve blood supply to damaged tissue, and enhances collagen synthesis at injury sites

Bioavailability limitations require 2-3x higher doses for nasal versus injectable delivery , creating corresponding 2-3x cost increases that make nasal spray primarily appropriate for needle-phobic individuals or peptides specifically designed for nasal use

Neuroendocrine and stress-axis studies: evaluating peptide-associated changes in experimental stress-response frameworks