Klorane | Intense Strengthening Serum with Quinine

What It Is: Intense Strengthening Serum with Quinine is a clinically proven formula designed to visibly reduce hair thinning, while protecting hair from the harmful effects of stress, leaving hair thicker, stronger and healthier. How to Use: Apply 10 sprays directly to towel dried scalp. Massage in. Do not rinse. Use 3 times a week for 3 months. Editor Feedback: "Some scalp serums feel greasy and oily; this one leaves zero residue behind, allowing for easy styling." —Danielle Dooley, director of editorial partnerships Key Ingredients: This hair serum helps support stronger, healthier-looking hair with quinine and caffeine to help slow hair thinning and reinforce hair anchorage for 2x stronger strands. Camu-camu helps protect hair from stress-induced damage, while biotin supports nourishment for both the hair and scalp. Expert Insight: "Klorane's Intense Strengthening Serum visibly reduces hair thinning thanks to quinine, caffeine & camu-camu, with proven efficacy to help improve the appearance of hair stressed by environmental factors. This formula visibly protects and strengthens hair efficiently while being safe during pregnancy & breastfeeding.” —Jackie Hoesch Smith, executive director brand marketing, USA