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That matters because a prescription pen or vial from an approved medication has a defined label, dose, route, manufacturing standard, and patient instructions

Receptors Based on the Solution Structure of the Peptide Ligand, Ac-Nle-cyclo[Asp-Pro-DPhe-Arg-Trp-Lys]-NH2 Fotsch C, Smith DM, Adams JA, Cheetham J, Croghan M, Doherty EM, Hale C, Jarosinski MA, Kelly MG, Norman MH, Tamayo NA, Xi N and Baumgartner JW Bioorganic & Medicinal Chemistry Letters 13 2003 Discovery of a Nanomolar Non-Peptidic Agonist A Good Starting Point for Further Developments articles Design of a New Peptidomimetic Agonist for the Melanocortin

It's long enough to safely penetrate beneath the skin without reaching muscle or nerves

Regeneration of the entire human epidermis using transgenic stem cells

The plates were equilibrated for 2 h at 25 C

Neither appears to be clearly superior based on the available evidence