L'Oréal Professionnel Vitamino Color Spectrum Glass Shine Serum

L'Oréal Professionnel Serie Expert Vitamino Color Spectrum — Glass Shine leave-in serum for coloured hair

Glass Shine Serum is the final and essential step in the Vitamino Color Spectrum routine. This heat-activated leave-in serum is applied to damp hair after shampoo and conditioner or mask, is not rinsed out, and seals the results of the entire system when blow-drying or using straighteners. The key technology is Alpha-Silane 5%: a specialised silicone complex that, when heated, forms covalent bonds with the hair's keratin, creating a long-lasting protective barrier. The result — glass-like shine that lasts up to 10 washes, anti-frizz effect for up to 72 hours, humidity protection of up to 80%, and heat protection up to 230°C. Within the complete Spectrum routine — up to 100 days of first-day colour vibrancy retention. The formula is free from water and surfactants — purely a silicone base with natural aromatic oils.

Key features and benefits

• Alpha-Silane 5% — sealing technology (Bis-(Morpholinomethyl C1-4 Dialkoxysiloxy) Dimethicone) — a patented reactive silicone with morpholine functional groups. When heated with a hairdryer or straightener, the molecule activates and covalently bonds with the amine groups of keratin. This is a fundamental difference from conventional leave-in silicones: the effect is not merely surface-level but chemically anchored to the hair. This is why the smoothness and shine last up to 10 washes, rather than disappearing after the first shampoo.
• Bis-Cetearyl Amodimethicone — an amino-functional silicone with cetearyl side chains. It selectively deposits on the most damaged and porous areas of the cuticle, filling surface micro-irregularities and creating a "mirror-like" light reflection effect. This ingredient is responsible for the signature glass-like shine that enhances the visual vibrancy and colour saturation of dyed hair.
• Dimethicone — a basic linear silicone that forms a uniform protective film along the entire length. It provides heat protection up to 230°C, slip for detangling, and an initial barrier against humidity. It acts as a "carrier", distributing the two reactive silicones evenly across the hair surface.
• Pogostemon Cablin Oil (Patchouli Oil) — an essential oil with a woody-musky aromatic profile. In the serum, apart from its fragrance function, it acts as a natural antioxidant, additionally protecting the pigment from oxidative degradation. It is the patchouli oil, combined with Citrus Limon Peel Oil, Rose Ketones and Vanillin, that forms the signature complex fragrance of the Spectrum line — a citrus-floral note with a warm woody trail.
• Citrus Limon Peel Oil + Carvone + Limonene + Pinene — a natural terpene complex from lemon peel oil and individual aromatic molecules. It further enhances hair shine through the mild smoothing effect of terpenes on the cuticle surface.
• Heat activation as the key mechanism. Without heating, the serum works as a standard surface-level leave-in protection. When blow-drying (minimum 180°C) and especially when using straighteners, Bis-(Morpholinomethyl C1-4 Dialkoxysiloxy) Dimethicone activates and covalently bonds with keratin — only in this case are the claimed effects of up to 10 washes and 72 hours of anti-frizz achieved.

Who the product is for

The serum is the final step of the Vitamino Color Spectrum routine and is designed for all types of coloured, highlighted and bleached hair. It is particularly relevant for those living in high-humidity conditions, frequently using heat styling tools, or wanting to maximise colour vibrancy and saturation between salon visits. Thanks to its pure silicone base, it does not weigh down even fine hair when dosage is observed: 1–2 pumps for fine to medium hair, 3–4 for thick hair.

Directions for use

Shake the bottle well before use. Apply to freshly washed damp hair: spray 1–2 pumps into the palm for fine to medium hair or 3–4 pumps for thick hair, rub between palms and distribute evenly from mid-lengths to ends. Do not rinse. Blow-dry until completely dry; for maximum and longest-lasting effect, run a straightener over the hair at 180°C or above. Use with every wash as the final step of the Vitamino Color Spectrum routine.

Ingredients: