The purpose of concentrated protein conditioners is to

• A. Penetrate the cortex
• B. Coat the surface
• C. Neutralize odors
• D. Add shine

Answer: (A)

Concentrated protein conditioners are meant to reinforce the hair from the inside by delivering proteins that can penetrate the cuticle and reach the cortex, where they help rebuild and strengthen the keratin matrix. This internal support improves tensile strength and reduces breakage, especially in chemically treated or porous hair. Regular conditioners primarily coat the surface to smooth and soften, which is why coating the surface isn’t the primary purpose here. Neutralizing odors or adding shine aren’t the main goals of these concentrated protein formulas; odor control and shine come from other ingredients and surface effects, while the protein is chosen for internal repair. Used appropriately, these treatments restore strength without sacrificing flexibility, addressing the internal structure rather than just the outer appearance.