Symbios Peptid Densifying Mask. Contains an innovative biotin tripeptide that combines vitamin H (biotin) with approximately 20 amino acids. This combination effectively strengthens the hair at a molecular level, supporting its restructuring. The formula is also enriched with Palmaria palmata algae extract and arginine – a key amino acid that promotes hair health. It improves overall hair condition, provides a shiny appearance, increases volume, and makes detangling easier. How to use: Apply to hair washed with Symbios Peptid Densifying Shampoo, leave on for at least 2 to 5 minutes, then rinse with water.