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GHK-Cu is present in plasma, saliva, and urine, with plasma levels declining with age

Toxicol Sci 49:156164 Harrill AH, Watkins PB, Su S, Ross PK, Harbourt DE, Stylianou IM et al (2009) Mouse population-guided resequencing reveals that variants in CD44 contribute to acetaminophen-induced liver injury in humans

Despite the research saying that MOTS-c may be useful as a cancer therapy, other studies have made contradicting claims that it can lead to the development of prostate and breast cancer.43 Our known providers likewise warn that people with an active cancer diagnosis should avoid MOTS-c unless otherwise recommended by their doctor

This makes it an excellent option if you dont want frequent injections

Ann Nutr Metab 61 (3), 207-212