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Nasal spray considerations: Typically lower bioavailability than injection, requiring somewhat higher doses Faster onset in some users due to direct CNS access More convenient and less intimidating for needle-averse individuals Requires properly calibrated spray bottles for accurate dosing Converting from injectable to nasal dosing is not straightforward

In the coming years, it will be revealing for researchers to build on lab-based evidence in well-designed, large-scale clinical trials

Cysteine precursors, rather than cysteine itself, are used because they are more cell-permeable, and can be given orally

International Journal of Molecular Sciences, 19 (7)