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This is the most mechanistically coherent use case for oral delivery because the peptide acts locally before it is degraded

Likewise, copper is the cofactor of metabolic enzymes (e.g., cytochrome c oxidase in mitochondria, CuZnSOD in cytosol) and it catalyzes the enzymatic activity of key enzymes of the secretory pathway (reviewed in Polishchuk and Lutsenko, 2013

Insulin therapy should begin as soon as possible after diagnosis (Whitlatch 2015

For systemic recovery, longevity, or wound-healing indications, injectable is the prescribed format

J Neurosci Off J Soc Neurosci 37:1183511853

Chicken: Lean chicken breast is a good source of protein and essential nutrients