Active cancer is a relative contraindication: because GHK-Cu promotes cell growth, providers avoid it in uncontrolled malignancy (though ironically it also has anti-cancer gene effects)
However, contrary to this opinion, we believe that in the specific case of COVID-19 it is of paramount importance taking due account of the fact that PAC and its metabolites decrease GSH levels, also when given at relatively low doses in healthy volunteers (Nuttall et al., 2003
Intranodal mouse metastasis models and in vivo administration of Fento-1 Mouse breast cancer cells (4T1) were transplanted into 68-week-old female Balb/c mice (syngeneic with the 4T1 model)
Laboratory factors such as macro-B12 (immunoglobulin-bound B12) can cause spurious elevation on some assays
10.1183/09031936.02.00262402 Eur Respir J
Purity must meet or exceed 98.0%, and a lot-specific Certificate of Analysis (COA) is provided