Many keratin serums are formulated for all hair types, and several specifically note suitability for frizzy or coarse hair. In practice, they commonly suit both general use and frizz-prone textures.
Keratin treatments appear in several formats, including serums, sprays, liquids, cream-style smoothing stylers, and wand applicators designed for targeted edge or flyaway control.
Common ingredients include keratin or plant-based proteins; nourishing oils such as argan, jojoba, and avocado; reconstructive actives like creatine; and botanicals or actives such as kombucha, red algae, and phytic acid. Some formulas also list minerals or other specialized extracts.