Positives

• A human study described pronounced recovery of structure and function after peripheral nerve trauma in patients receiving Cortagen, with additional cardiovascular and cerebrovascular improvements PubMed.
  
  
• Animal work suggested Cortagen produced motor stimulation without the anxiogenic arousal seen with the parent extract Cortexin during repeated dosing PubMed.
  
  

Negatives

• A patient seeking rigorous evidence will find that available human data are uncontrolled Russian observational reports, with no blinded Western trials and no long COVID trials at all PubMed.
  
  
• A patient comparing peptides should know Cortagen's effects overlap heavily with related Khavinson tetrapeptides, making it hard to attribute any benefit to this molecule specifically MDPI.
  
  

Hurdles & Side Effects

• A US patient cannot legally obtain Cortagen as a prescription product and must rely on grey-market peptide vendors with variable identity and purity MDPI.
  
  
• A patient self-administering must inject or atomize the reconstituted peptide and maintain cold storage between doses to preserve activity PubMed.