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Lyophilized powder maintains stability for 2-3 years at freezer temperatures (-20C to -80C) or 1-2 years refrigerated at 2-8C

Retrieved May 2, 2025, from (Content notes FDA approval 1997 and withdrawal 2008 for commercial reasons.) Askinazi, O

How can I be sure that the injection worked

That conversion happens in two steps: your skin first turns Retinol into Retinaldehyde (also called Retinal), then turns Retinaldehyde into Retinoic Acid

Other risks may include hormone imbalances or water retention

Special Considerations Copper Metabolism GHK-Cu contains a copper ion, which raises the question of whether copper accumulation could be a concern