Olaplex No.4Curl Bond Shaper Hydrating Curl Shampoo

Most shampoos are designed for straight hair — they cleanse the scalp efficiently but don't account for the structural reality of curly and coily hair, where each bend in the fibre is a point of vulnerability, where porosity is higher, and where the very act of cleansing can collapse the curl pattern before styling even begins. OLAPLEX Nº.4 CURL Bond Shaper™ Shampoo starts from a different premise: a silky, creme-gel formula that removes buildup without stripping, delivers bond-building actives during the wash step, and leaves the curl pattern intact — not just cleansed but actively strengthened — by the time it reaches the conditioner.

Nº.4 CURL Bond Shaper™ is powered by the same two proprietary OLAPLEX technologies as the Nº.5 CURL Conditioner, working at the cleanse step rather than after it.

Patented 3D Bond Shaper™ Technology uses sh-Oligopeptide-281 SP — a bond-building peptide that reinforces disulfide bonds from six points in multiple directions during the wash. Curly and coily hair has an asymmetric disulfide bond distribution along each bend and twist of the fibre — more bends means more structural vulnerabilities, and mechanical stress during shampooing (scrubbing, lathering, rinsing) puts those vulnerable points under direct pressure. Delivering the 3D bond repair at the cleanse step means the hair exits the shower already strengthened, rather than arriving at the conditioner step in a more depleted state.

Hydra-Define Technology™ — Hydroxypropyltrimonium Hyaluronate — deposits at points of cuticle damage during cleansing, sealing the cuticle surface with a positively charged hyaluronic acid complex that locks in hydration and begins building the humidity-blocking film that delivers the 50% frizz reduction result. Delivering this at the shampoo step extends the contact time of the active across both wash and condition steps when used as a system, compounding the efficacy.

The surfactant system — built around Cocamidopropyl Hydroxysultaine and Sodium Lauroyl Methyl Isethionate — is a sulfate-free, mild system that produces a silky creme-gel lather rather than a traditional foam. This is deliberate: foam can disrupt curl pattern and cause mechanical friction on the hair shaft during rinsing. The creme-gel texture distributes evenly through coily and curly hair without requiring aggressive scrubbing, minimising the mechanical stress at each vulnerable bond point during the cleanse.

Carthamus Tinctorius (Safflower) Oleosomes — oil-filled microspheres derived from safflower — release conditioning fatty acids during the rinse as the emulsion breaks, delivering a deposit of nourishing oil precisely when the cuticle is open and most receptive. Salvia Hispanica (Chia) Seed Extract and Ilex Paraguariensis (Yerba Mate) Leaf Extract provide antioxidant protection and moisture-binding. Linum Usitatissimum (Linseed) Seed Extract delivers Omega-3 fatty acids that reinforce the hair's natural lipid barrier. Panthenol penetrates the cortex and begins binding moisture at the structural level during cleansing. Glycerin provides immediate surface humectancy. Acacia Senegal Gum provides lightweight curl-memory support and definition during the rinse.

The formula contains no protein, no silicones, no SLS/SLES, no parabens, no phthalates.

When used as a system with Nº.5CURL Bond Shaper™ Conditioner:

• Instantly strong hair and less breakage in one use
• Infinitely defined curls
• 7 days of hydrated curls
• 50% less frizz, even in high humidity
• 96% agree hair was easier to detangle

Dermatologist tested. Vegan. Colour-safe.

Metro Vancouver note: Hard water mineral deposits accumulate on the porous surface of curly and coily hair faster than on straight hair — the uneven, scaled cuticle structure traps calcium and magnesium deposits that dull curl definition and block moisture uptake. If curl definition is inconsistent or hydrating products underperform, mineral buildup is often the compounding factor. See our Hard Water Hair Damage hub for the chelation protocol before your next OLAPLEX wash.

Who It's For Coily (4A–4C), curly (3A–3C), and wavy (2A–2C) hair of all densities and porosity levels. The protein-free, silicone-free formula is appropriate for curl types that experience stiffness from protein overload or buildup from silicone-heavy products. Works on colour-treated, bleached, and chemically processed curly hair. Gentle enough for every wash day.

Pair with OLAPLEX Nº.5 CURL Bond Shaper™ Conditioner → for the full system

Key Ingredients

• sh-Oligopeptide-281 SP (3D Bond Shaper™ Technology, Patented) — Rebuilds disulfide bonds from six points in multiple directions during cleansing, strengthening curl-forming bonds at their most vulnerable points
• Hydroxypropyltrimonium Hyaluronate (Hydra-Define Technology™) — Positively charged hyaluronic acid deposits at damaged cuticle points, locking in hydration and building the humidity-blocking film that cuts frizz by 50%
• Carthamus Tinctorius (Safflower) Oleosomes — Oil-filled microspheres that release conditioning fatty acids during rinsing for in-shower nourishment without residue
• Salvia Hispanica (Chia) Seed Extract — Antioxidant and moisture-binding botanical
• Ilex Paraguariensis (Yerba Mate) Leaf Extract — Antioxidant botanical; supports scalp health
• Acacia Senegal Gum — Lightweight curl-memory support and definition during rinse
• Panthenol — Penetrates the cortex during cleansing to begin moisture binding structurally
• Glycerin — Humectant; provides immediate surface moisture retention
• Sulfate-free surfactant system (Cocamidopropyl Hydroxysultaine, Sodium Lauroyl Methyl Isethionate) — Creme-gel lather that cleanses thoroughly without stripping or disrupting the curl pattern

HOW TO USE: Apply to wet hair. Work through the scalp and lengths with fingertips — do not scrub or pile hair on top of the head. Rinse thoroughly. Follow immediately with Nº.5CURL Bond Shaper™ Hydrating Conditioner for full system results. Suitable for every wash day. Achieved when Nº.4CURL and Nº.5CURL are used together as a system.