Ingredient Dictionary

Browse our entire database of scientifically-backed cosmetic ingredients. Uncover the chemistry behind your favorite skincare products.

Active Ingredients

Hydroxyphenoxy Propionic Acid

The non-toxic Hydroquinone alternative.

Soothing / Anti-Inflammatory

Hydroxyphenyl Propamidobenzoic Acid

The synthetic oat active for severe itching.

Active Ingredients

Hydroxypinacolone Retinoate

The direct-binding, peel-free retinoid ester.

Functional / Support

Hydroxypropyl Cyclodextrin

The donut-shaped molecule that protects Retinol.

Functional / Support

Hydroxypropyl Methylcellulose

The ultra-gentle, plant-based thickener.

Active Ingredients

Hydroxypropyl Tetrahydropyrantriol

The patented L'Oreal volume restorer.

Hydrator / Humectant

Hydroxypropyltrimonium Hyaluronate

The HA that survives being washed off.

Antioxidant

Hydroxytyrosol

The ultra-pure olive antioxidant.

Soothing / Anti-Inflammatory

Hypnea Musciformis Extract

The glycation-fighting red seaweed.

Functional / Support

Hyssopus Officinalis Extract

The purifying, pore-cleansing herb.

Antioxidant

Idebenone

The synthetic, upgraded version of CoQ10.

Antioxidant

Ilex Paraguariensis Leaf Extract

The vitamin-packed, energizing tea extract.