Revive dull, brittle hair with Ms. Bond Building + Strengthening Serum. Enriched with silk amino acids and coconut alkanes, the reparative formula restores chemically-treated and heat-damaged hair, while also protecting it against future breakage, leaving you with soft, smooth, and glossy strands.*Study results reflect improvements measured on hair treated with Ms. Bond Building + Strengthening Shampoo, Conditioner, & Serum vs. untreated hair. **Based on instrumental test results when used as a system of Ms. Bond Building + Strengthening Shampoo, Conditioner, & Serum.***Results are based on instrumental tests after applying Ms. Bond Building + Strengthening Shampoo, Conditioner, & Serum conducted under controlled conditions.****Instrumental test, after applying Ms. Bond Building + Strengthening Shampoo, Conditioner, & Serum vs. non-conditioning shampoo.