Cosmetic thickeners and yield-value builders — carbomer, xanthan gum, hydroxyethylcellulose, acrylate crosspolymer, and behenyl alcohol — for gels, lotions, serums, and emulsions across pH ranges.
Rheology modifiers for personal care are ingredients that set a formula's viscosity, yield value, and flow so it suspends, spreads, and stays stable. They fall into two working classes: synthetic crosslinked polyacrylates (carbomers and acrylate crosspolymers) that build clarity and high yield value at low use levels, and natural or semisynthetic hydrocolloids (xanthan gum, hydroxyethylcellulose) that thicken across wider pH and electrolyte ranges. Most systems combine one of each.
Carbomers thicken efficiently — typically 0.1 to 1% — and give the sparkling gels used in serums, but they must be neutralized to roughly pH 5.5 to 7 to develop viscosity. The honest trade-off: the clarity and yield value that make carbomers ideal for clear gels are the same properties that make them lose viscosity in high-electrolyte or low-pH systems. Where a formula carries surfactants or salts, specify a hydrophobically modified acrylate crosspolymer or a hydrocolloid instead.
Xanthan gum and hydroxyethylcellulose are pH- and electrolyte-tolerant thickeners for surfactant systems and natural-positioned formulas; xanthan also suspends particles and helps stabilize emulsions. Behenyl alcohol is a fatty-alcohol consistency factor that builds body in the oil phase of creams. Pair a primary polymeric thickener with a consistency factor rather than over-dosing a single ingredient.
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