As levels decline with age, replenishing GHK-Cu has become an attractive therapeutic strategy in regenerative medicine and dermatology
The most common side effect is mild discomfort at the injection site
It remains a phenomenon as well, that even if you treat a cat for a disease like IBD with steroids or immunosuppressant medication and a prescription diet, their response will never be as full or complete unless B12 supplementation is also included
GHK-CU research concentrations vary by application, with tissue culture studies employing concentrations around 0.3 mg/mL in specific experimental contexts
Reported benefits (per available research): Studied for its ability to raise GH and IGF-1 toward youthful levels and blunt age-related loss of fat-free mass, based on a 2-year randomized, placebo-controlled trial in 65 healthy older adults (Nass et al., 2008, Annals of Internal Medicine, PMID 18981485)