It's normal for your medication's color or the number of syringe units to change between shipments. Color changes usually happen when the compounding pharmacy switches between vitamin B6 (clear/yellow solution) and vitamin B12 (pink/red solution). Unit changes happen when the vial concentration changes - your dose in milligrams stays the same, but the volume you inject may be different.
If the color changed: This reflects a change in the added vitamin, not the active medication. Both formulations are safe and effective.
If the units changed: Check the concentration on your new vial label (e.g., 10 mg/mL vs. 20 mg/mL). Your provider will update your instructions to match. Always confirm your dose in milligrams, not just units, before injecting.