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Only 110% of administered drugs, depending on the structure and molecular weight, can reach the brain through the transnasal route
That distinction matters for long-term sleep quality, morning alertness, and the overnight recovery processes (GH release, tissue repair, immune function) that depend on genuine deep sleep
P.TakamiY.NakayamaT.SuikoM.LiuM
No mention of the 20% fee, and no explicit statement of whether the clock starts at purchase or delivery
Blood 106:4446, 2005
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