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Your Gift with Purchase
All October, get a FREE Number 4 Shopping Bag with all purchases of $100+ while supplies last.
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The Fall Edit
Seasonal changes call for specialized hair care. These tried-and-true formulas perform for autumn-savvy style.
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Build Your Own Bundle
Bundle and save 15% on your favorite three products.
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
Shop By Benefit
Moisture + Repair
Add essential hydration for ultimate hair health.
Volume + Fullness
Add instant volume and lift.
Anti-Frizz + Smooth
Stop frizz before it starts.
Style Support
Create lasting texture, hold, and shine
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Never run out of your hair care essentials again. Set it, forget it, and save 15%! Pause, skip, or cancel your subscription any time.
The Jet Set
Transport strands with mini versions of your favorite formulas. Good things come in small packages.
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You’ve probably noticed—we love collaborating with stylists who share Number 4 High Performance Hair...
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