Muicin Shine & Style Straightening Keratin & Protein Hair Serum 50ml is a hair care product designed to provide shine, smoothness, and manageability to the hair, particularly for those who prefer straightened styles. The serum helps to tame unruly hair and promote a straighter appearance by smoothing the hair cuticle and reducing frizz. It provides a sleek and polished look to the hair, making it easier to style. Keratin is a protein that is naturally found in hair and is known for its smoothing and strengthening properties.