Redken Acidic Bonding Curls Leave-In Treatment for Curly & Coily Hair — Silicone-Free, Heat Protectant to 450°F

Redken Acidic Bonding Curls Leave-In Treatment is a silicone-free leave-in for curly and coily hair that repairs weakened bonds, defines curl pattern, detangles, and protects from heat up to 450°F.

This lightweight, leave-in formula from Redken is built around Curl-Bond Technology — a blend of citric acid, glycine and urea — and enriched with avocado and camelina oils to deliver hydration, improved manageability, and enhanced curl definition. Designed to work alone or as part of the Acidic Bonding Curls system (shampoo, conditioner, leave-in), it targets the common needs of 3A–4C curl types: rebuilding internal strength, reducing frizz, and improving detangling without silicones, sulfates, or parabens.

How does this leave-in help repair and strengthen curls?

The product uses Curl-Bond Technology to support bond rebuilding inside the hair fiber while supplying conditioning ingredients to the strand surface. Over repeated use it helps hair feel more resilient and reduces the visible signs of damage such as rough texture and split-end appearance.

• Citric acid, glycine and urea work together to support internal bond structure.
• Avocado and camelina oils add softness and slip for smoother strands.
• Silicone-free formulation so moisture and repair ingredients reach the hair directly.

Will it detangle and define my curls without weighing them down?

Yes — the leave-in is formulated to improve comb-through and curl clarity while keeping natural movement. Redken reports easier detangling, smoother feel, and increased conditioning compared with a non-conditioning shampoo, making styling faster and less damaging.

• 12x easier detangling and 12x smoother feel versus a non-conditioning shampoo (as tested).
• Provides definition and 72-hour hydrating and anti-frizz support when used properly.
• Lightweight texture designed to preserve shape and volume for up to 96 hours.

How effective is the heat protection and is it safe for color-treated hair?

The leave-in offers thermal shielding rated up to 450°F, suitable as a prep step before heat styling tools. Its formula is compatible with color-treated hair and avoids common harsh surfactants and silicones, making it a gentle option for maintained color vibrancy.

• Heat protectant rated to 450°F to reduce stress from blow-drying and hot tools.
• Free from sulfates, silicones and parabens, formulated to be color-friendly.
• Can be used before diffusing or styling to guard curl integrity.

What results can I expect when I use the full Acidic Bonding Curls system?

When combined with the matching shampoo and conditioner, users reported improvements in curl health and definition after just one use. The system is designed to restore curl pattern and provide extended frizz control and volume retention through targeted bond care and hydration.

• System users observed more defined, healthier-looking curls after one use (system testing).
• Claims include reduced frizz and extended body for up to 96 hours with full system use.
• Formulated specifically for curl types 3A–4C to support pattern restoration.

Who is this for: Redken Acidic Bonding Curls Leave-In Treatment is best suited for people with curly or coily hair who want bond-repairing care without silicones, need easier detangling and curl definition, and who style with heat tools. It works well for color-treated curls and for anyone aiming to improve curl strength, reduce frizz and maintain shape between washes.

Note: Individual results vary. Performance statements are based on internal testing and consumer use of the Acidic Bonding Curls system.

Ingredients

1218393RK4 - INGREDIENTS: AQUA / WATER / EAU • SORBITOL • CETEARYL ALCOHOL • GLYCERIN • BEHENTRIMONIUM CHLORIDE • PERSEA GRATISSIMA OIL / AVOCADO OIL • BIS-DIGLYCERYL POLYACYLADIPATE-2 • TOCOPHERYL ACETATE • CAMELINA SATIVA SEED OIL • PHENOXYETHANOL • HYDROXYETHYL UREA • CETYL ESTERS • PARFUM / FRAGRANCE • ISOPROPYL ALCOHOL • POLYQUATERNIUM-37 • SODIUM CITRATE • POLYQUATERNIUM-4 • PROPYLENE GLYCOL DICAPRYLATE/DICAPRATE • CITRIC ACID • PECTIN • LIMONENE • PPG-1 TRIDECETH-6 • GLYCINE • SUCROSE • LINALOOL • ACRYLATES/STEARYL METHACRYLATE COPOLYMER • SORBITAN OLEATE • CITRONELLOL • CITRAL • EUGENOL • EDTA • TOCOPHEROL • HELIANTHUS ANNUUS SEED OIL / SUNFLOWER SEED OIL • ROSMARINUS OFFICINALIS LEAF EXTRACT / ROSEMARY LEAF EXTRACT (F.I.L. T70033286/1).