its administered via injections or capsules in clinical settings.[4] It enhances fat burning, energy, insulin sensitivity, muscle preservation, and repair, while indirectly boosting NAD+ by slowing depletion.[5][23][24] Its membrane-permeable nature allows efficient cellular entry, making it suitable for therapeutic use
Nazar-Stewart V et al
They are biologically plausible, but they do not amount to a large, independently replicated clinical evidence base
So, which option you choose will depend on what you are trying to achieve with GHK and how much you are willing to go through for it
"Pharmacokinetics of high doses of cyanocobalamin administered by intravenous injection for 26 weeks in rats"
We include them as standard because a program without metabolic support is a harder program than it needs to be