Analysis of new growth promoting black market products
Krug O, Thomas A, Malerød-Fjeld H, et al. Growth Hormone & IGF Research 2018;41:1-6.
What it found
Doping control labs identified a modified growth hormone with an extra amino acid and three glycine-extended secretagogues (Gly-GHRP-6, Gly-GHRP-2 and Gly-ipamorelin) in black market products. Their structures were confirmed by mass spectrometry and, for two of them, by custom synthesis.
Limitations
Describes what was found in seized products, not how common it is. The effects of these modified peptides in people are unknown.
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