Sephora Peptides Serum Treatments Skincare, Beauty Kohl's Wondering what gives Squalane + Copper Peptide Rapid Plumping Serum its beautiful blue color? The ingredient responsible for the unique hue is copper peptide. These collagen boosting peptides support elastin production, Glutathione for Skin: Your Key to a Youthful, Even Complexion* Glutathione: What It Is, Why You Need It, How You Can Increase It The Amino Company Unlock Health Benefits with Glutathione Supplements