Sunsilk Luminous 100 Leave On Hair Serum is a lightweight shine-enhancing serum developed for dull, frizzy and lacklustre hair that needs greater smoothness, luminosity and a polished finish. The leave-in formula is powered by a 5% Glycol and Vitamin C Complex designed to smooth and seal the hair surface for visibly healthier-looking, radiant strands. Glycol contributes to the smoothing action of the formula, helping improve the appearance of rough and uneven hair, while Vitamin C provides antioxidant care and supports a brighter, healthier-looking finish. The serum works along the hair strands to reduce frizz, smooth roughness and seal the appearance of split ends while enhancing shine without leaving heavy buildup. Sunsilk states that the formula provides up to 5 times more illuminated hair with shine that lasts for up to 100 hours. Its lightweight leave-on texture can be applied to towel-dried or dry hair and does not require rinsing, making it convenient for daily use before styling or whenever hair needs an additional boost of smoothness and radiance.