Meaning ❉ Keratin Protein Weight gently refers to the molecular dimensions of protein elements within hair preparations. For those tending to coils, curls, and waves, particularly within Black and mixed-heritage hair traditions, this measurement guides thoughtful product selection. A smaller protein weight, measured in daltons, suggests a finer structure capable of moving beyond the cuticle, settling within the hair’s cortex to bolster internal strength and elasticity. Conversely, larger protein weights typically offer a more superficial benefit, forming a protective film along the hair strand, which can help seal in moisture and reduce friction. Knowing this distinction allows for a more precise approach to hair care systematization, moving beyond trial-and-error to a truly informed routine. This insight permits a discerning practical application, ensuring protein treatments align with the hair’s current needs, whether it’s seeking deep structural support or gentle surface smoothing, ultimately contributing to resilient, vibrant hair.