A "lack of glow" in hair (dullness) is typically caused by a raised or damaged cuticle that prevents light from reflecting evenly. Restoring shine requires smoothing the hair surface, removing mineral buildup, and using light-reflecting oils.

Key Strategies for Hair Radiance:
Clarifying (The Reset): Hard water minerals and product buildup create a "film" that kills shine. Use a clarifying shampoo once a week to strip away dulling residues.
Acidic Rinses: The hair cuticle naturally closes in a low-pH environment. Products with an acidic pH (like apple cider vinegar rinses) "lock" the cuticle flat, resulting in instant shine.
Glossing Treatments: At-home glosses act like a "top coat" for your hair. These semi-permanent treatments fill in cracks in the hair shaft to create a mirror-like finish.
Cold Water Rinse: Finishing your shower with a burst of cold water helps flatten the cuticle, enhancing natural light reflection.