Most shampoos are primarily composed of five ingredient categories: water (as a solvent), surfactants such as sodium lauryl sulfate (SLS) or sodium laureth sulfate (SLES), conditioning agents such as silicones or quaternary ammonium compounds (quats), preservatives such as sodium benzoate, and fragrances or colorants.
NOT BSTOTAL BS
HARDLY BS — Verdict: Mostly True
Verified by Lenz ·
The Short Version
The claim captures the main functional backbone of many shampoo formulas. Technical references consistently describe shampoos as water-based systems built around surfactants, conditioning materials, preservatives, and aesthetic additives. However, it simplifies formulation practice by leaving out other routine categories such as co-surfactants, thickeners, and pH adjusters, and sodium benzoate is only one of several common preservative choices.
Caveats
The list is not exhaustive: many shampoos also include co-surfactants, viscosity modifiers, pH adjusters, opacifiers, and chelating agents.
Sodium benzoate is a legitimate preservative example, but mainstream shampoos also commonly use other preservative systems.
Not every shampoo contains all listed examples; sulfate-free, fragrance-free, colorant-free, and low-conditioning formulas are common variants.