duke shampoo

Common soothing or refreshing ingredients include tea tree oil and menthol; some formulas also list rosemary and arnica to help calm the scalp.

Salicylic acid is listed as an active to help exfoliate and clear build-up; the product category emphasizes formulas designed to remove dirt, oil, and residue.

They are formulated for all hair and scalp types—listings and descriptions repeatedly state suitability for all hair types.

Most items are sold as 14 fl oz liquid bottles.

Several formulations are described as being made without sulfates, parabens, and phthalates.

They are mainly positioned for basic cleansing and conditioning, with some formulas also described as nourishing.

Menthol is used repeatedly for a cooling, stimulating effect, and some formulations pair menthol with tea tree oil for a refreshing scalp sensation.