The ultimate question is does thickening hair shampoo really work? The simple answer is both yes and no and in certain circumstances. Hair thickening shampoos cannot alter the chemical structure of your hair, so they cannot permanently alter the thickness.

Kérastase Densifique Bain Densité Shampoo This Kérastase formula was a winner across the board in the GH Beauty Lab's hair thickening and volumizing shampoo test. It scored highest for making strands feel thicker, best at leaving hair feeling clean and earned top points for being lightweight.

Our formulas are free from sulfates, parabens, phthalates, GMOs, glycols, and gluten. We pride ourselves on being a vegan and cruelty-free brand, while also ensuring that our products maintain a balanced pH level, are color-safe, and sourced sustainably.

How It Works: Biotin-B Complex envelopes the hair shaft to build body and increase thickness, while Caffeine energizes the scalp and stimulates the hair follicle for extended vitality! Directions: Massage into wet hair and scalp. Rinse thoroughly. For best results, use with Hair ResQ™ Conditioner.