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Community experience and the underlying mechanism agree: GHK-Cu does not measurably change serum testosterone, DHT, or estradiol at typical doses

Notably, the serine peptidase kumamolysin from Alicyclobacillus sendaiensis has undergone multiple generations of computational redesign and optimisation (Kuma030, Kuma062, TAK-062, and KumaMax) (Pultz et al, 2021

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Simpson says peptides come in pills, injectables and now nasal sprays