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Nearly 40 years ago, it was discovered that the rat brain contained glucagon receptors, indicating that the hormone may play a part in controlling brain activity [33]

The beneficial effects of MPH on cognition occur through its inhibition of extracellular dopamine reuptake by the dopamine transporter in the caudate, putamen, nucleus accumbens, and prefrontal cortex

Day-time melatonin administration: effects on core temperature and sleep onset latency

doi: 10.1038/s41586-021-03442-1

10.1016/j.arr.2020.101207 Ageing Res Rev