Hydroxypropyl Cyclodextrin- A plant- derived or synthetic carbohydrate that functions as a chelating agent.
Hydroxypropyl Starch Phosphate- A plant-based or synthetic starch ingredient that functions as a thickener or bulking agent in cosmetics.
Hyssop- Fragrant plant extract that may have some beneficial properties.
Hydroxyethylpiperazine Ethane Sulfonic Acid- Also known by the acronym HEPES, hydroxyethylpiperazine ethane sulfonic acid is a buffering ingredient.
Hydroxyethyl Acrylate/Sodium Acryloyl Dimethyl Taurate Copolymer- A polymer that functions as a stabilizer, thickening agent, and opacifying agent.
Hydroquinone- Hydroquinone has long been established as the most effective ingredient for reducing brown spots.