Ingredient guides

What Does 1% Copper Peptide Mean?
Learn what to ask about a 1% copper peptide claim, including whether the percentage describes an active ingredient or a supplied blend. Read more...
Do Copper Peptides Help with a “Collagen Look”?
Understand copper peptide claims about firmer-looking skin, the difference between ingredient research and product evidence, and what to ask a brand. Read more...
Copper Peptides vs Collagen: What’s the Difference?
Learn how topical collagen and copper peptides differ, what their ingredient names mean, and what to check when comparing cosmetic skincare products. Read more...
How to Layer Copper Peptides
Where does a copper peptide serum fit in your routine? Explore application order and the product directions to check before combining skincare steps. Read more...
GHK-Cu vs Retinol: Complementary, Not a Contest
Explore the differences between copper peptides and retinol in skincare, plus questions to check against product directions when planning a routine. Read more...
How to Compare Copper Peptide Serums
Compare copper peptide serums by ingredient disclosure, bottle size, price and routine fit. A buying guide from Only Child, the maker of Blue Hour. Read more...
What Are Copper Peptides (GHK-Cu)?
Learn what copper peptides and GHK-Cu mean on skincare labels, how they appear in cosmetic formulas, and what to check when choosing a serum. Read more...