Below is what Google AI says. Sounds like it's not anything to worry about, especially if they're all like that, including the ones that haven't been shipped from the vendor yet. Also, JEEP is one of the more reliable vendors, from what I understand.
"A darker blue top and lighter blue bottom with a clear line of demarcation in a vial of lyophilized GHK-Cu is not generally considered ideal, but it is not immediately a sign of a ruined product. It often indicates an uneven distribution of the copper-peptide complex within the "puck" (the cake of powder).
Potential Causes for the Color Gradient
Manufacturing Variation (Lyophilization): The process of freeze-drying (lyophilization) involves freezing and then drying under vacuum. If the cooling or drying process was uneven, the concentration of the GHK-Cu peptide (which is naturally blue) might vary throughout the vial.
Settling/Separation: The separation of color might be due to fillers (such as mannitol) settling differently than the active peptide during the filling process.
Non-uniform Oxidation: While copper peptides should be stable, a minor, non-uniform distribution of moisture, or slight variation in the binding, can cause the top layer to appear darker (more concentrated) than the bottom.
Shipping/Physical Disturbance: The powder may have separated or "broken" during shipping, leading to a visible split, although the compound remains effective.
Is It Safe?
Normal Characteristics: A high-quality GHK-Cu powder is a pale blue to deep blue-violet powder, not grey, green, or white.
When to be Concerned: If the powder is white with only a few blue spots, or if it is greenish/brown, this might indicate degraded product, moisture intrusion, or low-quality synthesis.
Recommendation: Perform a reconstitution test. Reconstitute the vial with bacteriostatic water (or sterile water). It should dissolve fully within 2 minutes to a clear, consistent blue solution. If it does not dissolve properly or shows significant sediment, the batch may be flawed."