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Molecular size directly limits mucosal permeability, and peptides above a certain threshold do not cross the sublingual epithelium in clinically predictable amounts

One orthopedic specialist wrote that regulatory agencies must crack down on practitioners and pharmacies that expose patients to unapproved peptides

The FDA identifies significant risks including lack of human safety data, potential for adverse immune reactions, and insufficient evidence regarding long-term effects, with the agency authorized to take enforcement action against compounding pharmacies that produce these substances for clinical applications

Human dermal fibroblast studies show up to 70% increase in collagen production at optimal 1 nanomolar concentration, with collagen IV showing 25.4-fold increase when combined with hyaluronic acid

10.1016/j.numecd.2009.02.009 Nutr