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This effect was, however, completely reversible and had disappeared when the infants were re-examined two years later

However, the oral cavities also present significant barriers: the mucosal epithelium limits permeability, the presence of saliva causes rapid clearance, and enzymes in saliva contribute to peptide degradation

References Nakamura A, Nakashima M, Sakai K, Niwa M, Nozaki M, Shiomi H

& Desai, A

[14] Additionally, some countries prescribe memory drugs (e.g., donepezil or other Alzheimers medications) and racetam compounds (e.g., piracetam) for cognitive impairment or dementia

and the rules could shift again with a single advisory committee decision or administrative action