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Why it was included in the FDA ban The agency cited a lack of human trials and the risk for immune reactions and peptide impurities with injectable Thymosin Beta 4

If you want the broadest single overview, the Sikiric 2018 review cited above pulls the gastric, tendon, vascular, and CNS strands together with the original mechanistic framing

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Outside the CNS low level HRH3 expression has been found in the gastrointestinal and cardiovascular systems and in bronchial cells of the lungs

Research-Grade GHK-Cu: When we talk about research-grade GHK-Cu, like our own Ghk-cu Copper Peptide, we're referring to a product synthesized under stringent laboratory conditions with an unwavering focus on minimizing impurities