Glassflash — Cysteine Shine Serum

Step 5: Seal

The final act. Glassflash is a cysteine shine serum that seals the cuticle shut — locking in all the repair, hydration, and lift from the steps before, while flooding each strand with mirror-like shine.

Cysteine, the amino acid at the heart of the hair's protein structure, works to smooth and seal the cuticle layer, creating that coveted glass-hair effect. Light reflects off the surface in a single, unified direction — the definition of real glass hair.

• 🔬 Cysteine Sealing Complex — amino acid technology locks cuticles flat
• ✨ Mirror-Like Shine — light-reflecting finish for true glass hair
• 🛡️ Protective Barrier — shields against humidity, heat, and environmental damage
• 🧪 Science Backed — developed in Korea with 15+ years of protein structure research

50ml / 1.7oz