Cocamidopropyl Betaine (CAPB 30)

Cocamidopropyl Betaine, known by its INCI name Cocamidopropyl Betaine and often abbreviated to CAPB, is an amphoteric surfactant derived from coconut oil fatty acids combined with an amine. Being amphoteric means the molecule carries both a positive and negative charge depending on the pH of the formulation, which gives it unusual flexibility and stability across a wide range of formulation conditions.

This product is supplied at 30 percent active concentration, commonly referred to as CAPB 30, which is the standard commercial form used across most cosmetic manufacturing. It typically appears as a clear to light yellow, viscous liquid and is fully water soluble, making it straightforward to incorporate into aqueous formulations.

In cosmetic formulation, CAPB is classed primarily as a co-surfactant, foam booster and mildness enhancer, rather than a standalone primary cleanser. It is most often used alongside anionic surfactants such as Sodium Lauryl Sulfate or Sodium Coco Sulfate, where it softens their harshness while contributing to a richer, more stable foam. For anyone starting a cosmetic brand and formulating shampoos, body washes or facial cleansers, CAPB is considered one of the essential building block ingredients in a surfactant system.

Cocamidopropyl Betaine is used across such a wide range of cleansing products because it solves two problems that often work against each other in formulation, mildness and foam performance. On its own, it produces a decent lather, but its real value comes from how it behaves alongside other surfactants, softening the potential irritation of harsher anionic surfactants while boosting the overall volume and stability of the foam they produce together.

Its amphoteric nature means it can adapt to different pH environments, giving formulators a reliable, stable ingredient to build around regardless of the acidity of the finished product. This flexibility is part of why CAPB appears in such a broad spread of product types, from shampoos and body washes through to facial cleansers and baby products.

CAPB is also valued for its conditioning effect. Because the molecule carries a positive charge in acidic formulations, it can deposit lightly onto skin and hair, leaving a softer, less stripped feeling after rinsing compared to formulations relying solely on anionic surfactants. For a new brand formulating a sulfate free or gentle cleansing product, using CAPB alongside a primary surfactant is a well established way to achieve genuine mildness without giving up on foam quality, which matters to how customers perceive a product's effectiveness.

Cocamidopropyl Betaine, supplied here at 30 percent active concentration, is added to the water phase of a formulation and is fully water soluble, making it easy to incorporate with light mixing. It does not require heating, though it can be added during a warm phase if the rest of the formulation calls for one.

As supplied at 30 percent active, CAPB is typically used at around 8 to 20 percent of the total formulation in shampoos, body washes and facial cleansers, depending on the desired foam volume and mildness of the finished product. In gentle face and body cleansers, formulators often work toward the lower end of this range, while shampoos and higher foaming body washes may sit toward the upper end.

CAPB is rarely used as the sole surfactant in rinse off products, and performs best when blended with a primary surfactant such as Sodium Lauryl Sulfate, Sodium Coco Sulfate or Decyl Glucoside, where it boosts foam and softens the overall profile of the system. It is worth noting that CAPB is intended for rinse off use rather than leave on products, since prolonged skin contact increases the likelihood of irritation. As with any surfactant blend, running a small batch trial helps confirm foam quality, viscosity and mildness before scaling production.

The core benefit of Cocamidopropyl Betaine is its ability to improve both the mildness and the performance of a surfactant system at the same time. It softens the potential harshness of primary anionic surfactants while boosting foam volume and stability, giving formulators a practical way to build gentler products without sacrificing the rich lather customers expect.

Its amphoteric structure gives it broad compatibility across different pH environments and surfactant systems, making it one of the more flexible co-surfactants available, useful across shampoos, body washes, facial cleansers and baby products alike.

CAPB also brings a mild conditioning effect, helping hair and skin feel less stripped after rinsing compared to formulations relying only on stronger anionic surfactants. This conditioning behaviour is a key reason it appears so consistently in 2 in 1 shampoos and colour care formulations, where reducing cuticle roughness helps preserve colour vibrancy over repeated washes.

Finally, CAPB has a well documented safety record in rinse off cosmetic use, with modern high purity grades showing low sensitisation potential at typical concentrations, giving formulators confidence when building products aimed at sensitive skin, colour treated hair or baby care ranges.

Cocamidopropyl Betaine is almost always used alongside a primary surfactant. Consider pairing it with:

• Decyl Glucoside, a non ionic surfactant that combines well with CAPB in sulfate free formulations
• Coco Glucoside, another mild non ionic surfactant that pairs with CAPB to build a fuller, gentler foam
• Xanthan Gum, a natural thickener used to build viscosity in surfactant systems containing CAPB
• Panthenol, a conditioning agent that adds a soothing, moisturising benefit to cleansing formulas built around CAPB