Hair cosmetics may contain hydrolyzed proteins: proteins broken into smaller fragments. Reviews of cosmetic science describe how protein-derived ingredients can deposit on hair and contribute to conditioning. Their behaviour depends on factors such as molecular size, the formula and the condition of the hair.

This is more nuanced than saying every peptide travels to a broken bond and repairs it. Ingredient research should be distinguished from testing a complete product at the concentration and application method people actually use.

Hydrolyzed Keratin appears in the current ingredient lists for all three Get Glazy bottle formulas. Oligopeptide-1 and Ceramide NP are listed as separate ingredients; these names are not interchangeable.

Read the full ingredient list and usage directions for dry and damaged hair, wavy and curly hair, or coloured and bleached hair. A shared ingredient does not make the formulas identical or establish a particular result for the finished serum.

Check the product ingredient list rather than relying only on the word “peptide” on a page. Look for directions that suit your routine and judge whether your hair feels softer, smoother or easier to manage after use.

Start with a small amount of leave-in serum, especially on fine or short hair. More product is not automatically a better result. If the finish feels heavy, reduce the amount or frequency next time.

Explore the blue serum and its ingredient list, or read our Ceramide NP ingredient guide.

Sources: Hair Cosmetics: An Overview; On Hair Care Physicochemistry. These reviews describe cosmetic ingredients generally; they do not establish results for Get Glazy.