HAIR LENGTHENING SERUM 4.2FLOZ. Benefits: Strengthens at the root and supports longer stronger hair. Enriches hair follicles, reduces shedding and breakage. Creates a healthy scalp microbiome. For all hair types!. Dermatologist-Tested. No sulfates, silicones or parabens. Key Ingredients: L-Arginine: Naturally occurring amino acid in keratin that helps to minimize hair loss by protecting hair from damage, reducing hair breakage supporting the hair's moisture barrier.. Saw Palmetto: Known to promote thicker and fuller hair, reduce hair shedding, strengthen follicles and reduce inflammation.. Turmeric Oil: Antioxidant-rich oil that works to create a healthy scalp environment by providing nourishing and soothing benefits.. Arnica: Potent anti-inflammatory extract known for its healing benefits that work quickly to balance, soothe improve scalp health.. 93% Naturally-Derived Ingredients.. Research Results: Clinically proven longer and stronger hair*. Increases hair thickness by 50% in 90 day*. Reduces hair loss and breakage in 90 days*. Improves overall hair health by 75% in 90 days*. *Based on a third-party consumer study when using with Thickening Foam.