(PubMed) Cox AJ, Lehtinen AB, Xu J, et al
As a signal peptide, Matrixyl acts like a little messenger
Summary Keywords endocrinology, growth hormone secretagogues, IGF-1 analogues, off-label use, peptide hormones, performance-enhancing drugs, sports doping Citation Dominikowski A, Rko Z, Olejarz M, Szczepanek-Parulska E, Domin R and Ruchaa M (2026) The emerging landscape of performance-enhancing peptides modulating GH-IGF1 axis: bridging the gap between clinical evidence and patient self-administration
In this case, the product comes from the United States