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generally considered to offer the most reliable bioavailability Nasal spray less invasive, though bioavailability may be lower than injectable forms Sublingual tablets a convenient oral-adjacent option with variable absorption General dosage considerations Research protocols have typically explored dosages in the range of 100 to 500 micrograms per administration

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Intranasal insulin for mild cognitive impairment and Alzheimer's disease: a systematic review and meta-analysis of randomized controlled trials

Common side effects include nausea, vomiting, and diarrhoea