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L-citrulline avoids this fate, reaching the bloodstream intact

The peptide works by mimicking ghrelin at the pituitary gland, triggering GH release

Siberian ginseng (Eleutherococcus senticosus) 100 to 300 mg/d extract (Stengler 2016) Demonstrated effects on stress-induced fatigue, immune changes, and corticosterone elevations in an animal model of stress (Kimura 2004)

PubMed Blonde, L., Umpierrez, G.E., Reddy, S.S., McGill, J.B., Berga, S.L., Bush, M., et al

Other differences included peptides from the IGF family proteins, IGF1 and IGF-binding proteins 1 and 3 (IGFBP1 and IGFBP3)

Importantly, GHK-Cu did not negatively impact cell proliferation or NO secretion in these macrophages, suggesting its protective effects were specific to inflammatory pathways rather than general cytotoxicity [1]