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Comprehensive toxicology studies found no lethal dose even at extremely high levels (20 mg/kg intramuscularly in rats, equivalent to approximately 1,400 mg for a 155 pound human)

Regulatory uncertainty limits its medical positioning, currently placing it in the grey zone of experimental peptides These limitations make clinical endorsement premature, especially in regulated health systems or for medical-grade use

Keratin peptides should not be described as a direct treatment for genetic, hormonal, autoimmune, or scarring hair loss

Human clinical trial data remains limited, but the mechanistic and preclinical evidence base is stronger for gut-related peptides than for most other peptide research categories