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"Development of growth hormone secretagogues." Endocr Rev

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GHK-Cu boosts collagen types I, III, and IV and elastin synthesis, significantly improving firmness and elasticity

[PubMed Citation] The chemical warfare agent analog, 2-chloroethyl ethyl sulfide, known as 'half-mustard gas' (HMG), is less toxic and less of an environmental hazard than the full molecule and has been shown to produce an acute lung injury in rats when instilled via intrapulmonary injection