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Abstract Background Scopolamine is a muscarinic receptor antagonist and is widely utilized as a memory-loss model. However, its impact across different memory and attention tasks and using different modes of administration has yet to be clearly evaluated

Healthy male adults (age 42.9) ingested randomly placebo or different doses of L-threonine (0, 3, 6, 9, 12 g/day) for 4 weeks using a crossover design

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Acknowledgements This research was financially supported by China National Key R & D Program (2022YFE0113400) and Jiangsu Provincial Fund for Realizing Carbon Emission Peaking and Neutralization (BE2022305)