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Unexpected color change is typically a sign of contamination (note: GHK-Cu is naturally blue)
Find additional tips, troubleshooting help, and resources within our Protein Purification and Isolation Support Center.
Avoid taking it with alcohol or junk food, as they can reduce its effectiveness
People Taking Certain Medications Long-term use of metformin (a common diabetes medication) and proton pump inhibitors (PPIs) like omeprazole can reduce B12 absorption over time
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