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Tritium-labeled Semax studies demonstrate peak brain concentrations within 30 minutes of intranasal administration, with detectable levels persisting in hippocampal and cortical tissue for 24+ hours (PMID: 16523722)

What is the recommended dosage

Zhong L, Zhang S, Tang K, Zhou F, Zheng C, Zhang K, et al

The benefits of supplementing with selenium in cases of Hashimotos thyroiditis have been the subject of several investigations

In order to maintain a steady supply of glucose, glucagon strongly stimulates glycogenolysis and suppresses glycogenesis in the liver [28, 29]

If you're adequate but on the lower end of normal, optimizing your levels may produce a subtle, gradual benefit