can you take klow and nad together NAD+ and GHK-Cu aren't interchangeable! They're NAD+ Supplements: Benefits and Risks
Description
The off period is mainly there to address copper-accumulation concern from the GHK-Cu component, which makes up 62.5% of the blend
Jantti et al., 2022

10.1016/j.tox.2005.05.007 72 GuzmanK

Concentrations of guanidinoacetate in the pancreas of Phase-II HSB were elevated ( P 0.05) in pancreatic creatinine concentrations was detected among the three treatment groups

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PRISMA 2009 Checklist statement: This systematic review complies with the PRISMA 2009 guidelines, and the completed PRISMA checklist is provided in the supplementary materials