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Innovative Formulas for Iconic Style.
By combining nature’s finest ingredients and scientific innovation, we transform your hair into what it should be. Each ingredient is meticulously researched by our R&D team to bring you only the highest quality, most efficacious blends that deliver results.
Botanically Driven, Science-Backed
At Number 4, we believe nature knows best. Our formulas thoughtfully combine the power of nature’s finest, nutrient-dense actives with proven, high-performance technology to deliver results you can see and feel. Because when nature and science come together, magic happens.
Created with Conscience
Oh, and by the way… We exclude ingredients potentially toxic to humans, rare vintage couture, and our dear environment. We gently cleanse without harsh sulfates and style without any stripping alcohols. Every product is vegan and free of: sulfates, gluten, parabens and bad taste. We never test on animals; that’s not our style.
Liquid Complex Culture
Our unique complexes define all Number 4 products and draw upon water and an advanced delivery system to infuse active ingredients and botanical agents for consistent, high performance results.
Liquid Vitality Complex
Rich in potent antioxidants which promote and enhance youthful vitality. Contains super foods Acai Berry, Hibiscus, Mangosteen, and Vitamin C
Liquid Vibrance Complex
Nutrient-rich blend helps protect color while enhancing natural shine and vibrancy. Contains Black Current, Algae, Yerba Mate, and Edelweiss
Liquid Defense Complex
Revitalizes and helps strengthen and repair. Protects against environmental factors and stylistic damage. Contains Burdock Root, Oolong Tea, Moringa Seed Extract, Lavender, and Vegetable Protein
Liquid Purity Complex
Sulfate and sodium chloride (salt) free formulas help prevent buildup while helping protect color and natural sheen. Contains Lemongrass, Gooseberry, Oat Extract, and Pomegranate
Find Your Perfect Formulas
Take our quick Hair Quiz to unlock a personalized routine for your hair type and desires. Your best hair days await!