The two peptides share the copper-tripeptide structure, so a degree of read-across is biologically reasonable but "GHK-Cu does X, therefore AHK-Cu does X" is an inference, not a finding
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It is available as an oral dietary supplement in tablet form, or doctors can also prescribe it as a shot
This metabolic stability contrasts sharply with full-length growth hormone, which can cause glucose intolerance, elevated blood sugar, and insulin resistance (diabetogenic effects)
This matters because many adults with low B12, whether from dietary restriction, aging, or conditions like pernicious anemia, cannot absorb enough B12 through food or oral supplements alone