This nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) crosses the blood-brain barrier and has been investigated for its role in modulating slow-wave sleep architecture, stress response, and neuroendocrine regulation
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10.1183/16000617.0096-2016 62 LuoM.HeJ.YinL.ZhanP.ZhaoZ.XiongH.et al (2024)
If they persist, it could indicate an issue (though with high-purity GHK-Cu like ours, this is exceedingly rare)
Cao S, Wei Y, Yue Y, Liu P, Zeng H
That is the first thing to know