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Underlying health conditions: Some health conditions, such as gastrointestinal disorders or liver disease, can affect B12 absorption and metabolism, potentially leading to shorter-lasting benefits from B12 injections
Side effects most often develop in the first days of treatment
CityHealth San Leandro also offers B12 vitamin injections a quick walk-in treatment for energy, fatigue, and B12 deficiency
doi:10.1002/ana.22229
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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