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Lyophilized powder should be kept dry, sealed, cold, and protected from light
Lyophilized (unreconstituted) GHK-Cu powder stores much longer: Frozen at -20C: 18-24 months Refrigerated at 2-8C: 12-18 months Room temperature: 2-4 months maximum If you won't use a vial within 30 days of reconstitution, consider reconstituting smaller amounts more frequently rather than mixing everything at once
No special considerations beyond standard technique
This depends on the severity of symptoms, B12 levels, and overall health
FASEB Bioadv
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