Olaplex N°.4 Bond Maintenance Strengthening Shampoo 250 mL — Bond-repair, Color-safe Hydration

Olaplex N°.4 Bond Maintenance™ Strengthening Shampoo is a concentrated, bond-building cleanser that repairs everyday damage while hydrating and boosting shine in a single wash.

This salon-grade shampoo uses Olaplex’s patented bond-building chemistry to restore internal hair strength and improve manageability without stripping color or moisture. Formulated for medium to coarse hair but suitable for all hair types, N°.4 targets weakened bonds created by styling, chemical services, and environmental stressors. The result is smoother, shinier hair that’s easier to detangle and style after one use.

How does this shampoo rebuild and protect hair bonds?

N°.4 contains Olaplex’s active bond-rebuilding ingredient that works at the molecular level to reconnect broken disulfide bonds. Regular use replenishes structural integrity, which reduces breakage and helps hair resist future damage from heat and chemical processes.

• Patented bond-building chemistry repairs internal fiber links.
• Supports reduced breakage and improved tensile strength.
• Works best when paired within the Olaplex routine for cumulative benefits.

Will it strip color or dry out my hair?

No — the formula is color-safe and designed to gently cleanse using coconut-derived surfactants and hydrating agents. It removes buildup while maintaining moisture levels so color vibrancy and softness are preserved after washing.

• Coconut oil–derived surfactants for a rich lather without harsh stripping.
• Glycerin, panthenol, and sunflower seed oil help retain hydration and shine.
• Safe for chemically treated and color-treated hair when used as directed.

How will my hair feel and look after using N°.4?

Expect hair to feel smoother, detangle more easily, and display improved shine and manageability. Clinical system results show enhanced smoothness and a measurable decrease in breakage when used together with complementary Olaplex products.

• Smoother texture and easier comb-through after rinsing.
• Noticeable increase in shine and reduced frizz with regular use.
• Clinically supported improvements when used as part of the Nº 3–5 system.

How should I use this shampoo for best results?

Apply to wet hair, lather, and rinse; repeat if needed for heavier residue. For optimal bond repair and long-term health, follow with Olaplex N°.5 Bond Maintenance™ Conditioner and incorporate N°.3 Hair Perfector as a weekly treatment.

• Wet hair thoroughly; massage a small amount into scalp and lengths.
• Rinse and repeat for deeply cleansed hair; follow with conditioner.
• Combine with other Olaplex treatments for enhanced, cumulative benefits.

Who is this for: Olaplex N°.4 is ideal for anyone wanting to strengthen and hydrate hair that’s experienced breakage, chemical processing, frequent heat styling, or environmental wear. It’s especially suited to medium-to-coarse textures but gentle enough for color-treated and finer hair seeking improved manageability and shine. If your goal is to reduce breakage and restore elasticity while keeping color intact, N°.4 is formulated to be a core step in a science-backed haircare routine.

Ingredients

Water (Aqua/Eau), Sodium Lauroyl Methyl Isethionate, Cocamidopropyl Hydroxysultaine, Potassium Cocoyl Glycinate, Disodium Cocoyl Glutamate, Sodium Lauroyl Sarcosinate, Potassium Cocoate, Decyl Glucoside, Glycereth-26, Bis-aminopropyl Diglycol Dimaleate, Cocamidopropylamine Oxide, Disodium Laureth Sulfosuccinate, Glycol Distearate, Sodium Cocoyl Glutamate, Methyl Gluceth-20, Acrylates Copolymer, Peg-120 Methyl Glucose Dioleate, Amodimethicone, Citric Acid, Sodium Lauryl Sulfoacetate, Polyquaternium-10, Ethylhexylglycerin, Divinyldimethicone/Dimethicone Copolymer, Polyquaternium-11, Trisodium Ethylenediamine Disuccinate, Guar Hydroxypropyltrimonium Chloride, C11-15 Pareth-7, Laureth-9, Glycerin, Trideceth-12, C12-13 Pareth-23, C12-13 Pareth-3, Hydrolyzed Vegetable Protein, Pg-propyl Silanetriol, Panthenol, Acetic Acid, Tetrasodium Edta, Pentasodium Triphosphate, Sodium Hydroxide, Disodium Edta, Helianthus Annus (Sunflower) Seed Oil, Tocopherol, Prunus Armeniaca (Apricot) Kernel Oil, Pseudozyma Epicola/Camellia Sinensis Seed Oil Ferment Extract Filtrate, Pseudozyma Epicola/Argania Spinosa Kernel Oil Ferment Filtrate, Quaternium-95, Propanediol, Helianthus Annus (Sunflower) Seed Extract, Peg-8, Euterpe Oleracea Fruit Extract, Punica Granatum Extract, Rosemarinus Officinalis (Rosemary) Leaf Extract, Musa Sapientum (Banana) Fruit Extract, Origanum Vulgare Lear Extract, Morinda Citrifolia Fruit Extract, Articum Lappa Root Extract, Peg-8/Smdi Copolymer, Sodium Hyaluronate, Palmitoyl Myristyl Serinate, Sodium Polyacrylate, Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate, Biotin, Benzoic Acid, Phenoxyethanol, Chlorphenesin, Potassium Sorbate, Sodium Benzoate, Fragrance(Parfum), Citral, Hexyl Cinnamal, Limonene