Haircare Products Rooted in Nature's Best

High Performance Haircare Products Made for How Hair Actually Lives

Most haircare products solve one problem at a time. Number 4 is built differently. Every formula is designed to work within a complete routine, wash, treat, style, and finish, so your hair gets consistent, compounding care rather than a series of disconnected fixes. From the first wash to the final spray, everything here is made to work together.

Crafted with advanced botanical actives, Parisian-inspired fragrances, and clean formulas free from sodium sulfates, parabens, and anything your hair is better off without. Vegan, cruelty-free, and made in the USA.

Premium Haircare Products for Every Hair Type and Concern

Whether your hair needs deep moisture, visible lift, frizz control, or curl definition, there is a targeted formula here for it.

For dry or thirsty hair, the Hydrate Collection covers cleanse, condition, and treatment with formulas built around the L'Eau de Mare fragrance of ylang orchid, jasmine, vetiver, and patchouli.

For fine or flat hair, the Volume Collection lifts at the root and builds fullness from the very first wash without any heaviness.

For frizz-prone hair, the Anti-Frizz Collection addresses humidity and roughness at the cuticle level, from the shampoo step all the way through to the finishing touch.

For curly or textured hair, the Curl Support Collection hydrates, defines, and protects curl pattern across every step of the routine.

What Makes Number 4 Haircare Products Worth Using Every Day

Every formula is built on the proprietary Liquid Complex Culture, an advanced delivery system that helps botanical actives penetrate deeper and perform better. Key ingredients including acai berry, moringa seed extract, hibiscus, and argan oil nourish, protect, and strengthen hair from the inside out. Signature fragrances inspired by Parisian seasons and moments make every step of the routine feel like more than maintenance.

Sodium and sulfate-free, paraben-free, gluten-free, shark squalene-free, vegan, cruelty-free, and made in the USA. No compromise, no shortcuts.

Not Sure Which Haircare Products Are Right for Your Hair?

Take the Hair Quiz for a personalised routine matched to your hair type and goals. Or explore by need: Shampoo & Conditioner for the wash foundation, treatments for deeper repair, or Style Collection for a complete styling toolkit.