What should be stored where in a fridge and why? Domex Ltd Koreana Skin GHK Cu Copper Peptide Mask Revitalizing & Firming Hydrogel Sheet Mask GHK Copper Peptide GHK Cu Tripeptide 1 GHK CU 50mg OP Labs (Formerly Oxford Peptides) Most peptides don't come ready to inject they come as powder for a reason. Peptides are lyophilized (freeze dried) to keep them stable and effective. When you receive them, you simply: Add