Ingredient dictionary

Guar Hydroxypropyltrimonium Chloride

Also listed as: Cationic guar gum

A plant-based conditioning polymer made from guar gum, a bean-derived sugar chain with a positive charge. It helps hair and skin feel smooth and soft. It is on the label of 57 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Guar Hydroxypropyltrimonium Chloride does

Conditions hair and reduces static
Helps hair detangle and slip
Forms a light, smooth film
Adds thickness to water-based formulas

Guar gum comes from the seeds of the guar plant, a bean-like legume grown mainly in warm, dry areas. Its natural sugar chains are ground, cleaned and then modified. Chemists add hydroxypropyl groups to help it dissolve in water, plus quaternary ammonium groups, which carry a permanent positive charge.

That positive charge is the key. Hair and skin usually carry a slight negative charge, so the polymer is drawn to them and clings to the surface. It leaves a thin, slippery layer that smooths the hair or skin, cuts static, and helps hair comb through more easily when wet. In creams, it adds a soft, cushiony feel.

Good for

Suits shampoos, conditioners and moisturizers, especially for dry, frizzy or tangled hair and dry skin.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is guar hydroxypropyltrimonium chloride safe for skin?

It is generally well tolerated and is used in many shampoos, conditioners and creams. As with any ingredient, a small number of people may react to it, so patch testing a new product is a sensible step.

Does it cause buildup on hair?

It can, with heavy or frequent use, especially on fine hair. Using a gentler, lighter product or a clarifying shampoo now and then can help keep hair feeling light.