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This has made it a subject of investigation in studies examining restorative processes, stress adaptation, and central fatigue

however: Side effects can include flushing, headache, nasal congestion, visual disturbances, back pain (especially with tadalafil), and dyspepsia

Another strategy of drug modification for bypassing the BBB is conjugation to bioactive molecules, either those that are normally transported into the CNS by specific transport proteins or some that enter the CNS via receptor-mediated endocytosis by cerebrovascular endothelium

All usage described here is for research purposes only and is based on published studies, laboratory protocols, and anecdotal reports from the peptide research community