Ingredient Library

Skincare Ingredient Library

Each page covers common uses, timing, formulation notes, precautions and published pairings.

The English edition contains 14 source-checked and editorially reviewed Ingredients.

Showing 14 ingredients

Barrier and multifunctionalMorning or evening

Niacinamide

A versatile form of vitamin B3 commonly used in barrier-support, oil-control and brightening formulas.

Vitamin A derivativesEvening

Retinol

A common non-prescription vitamin A derivative that is usually introduced gradually in the evening.

Vitamin A derivativesEvening

Retinal

A vitamin A derivative that is chemically distinct from Retinol and should be introduced at low frequency in the evening.

Exfoliating acidsMorning or evening

Salicylic Acid

An oil-soluble exfoliating acid used in pore-focused routines; type, contact time and frequency matter.

Exfoliating acidsEvening

Glycolic Acid

A small-molecule AHA used for surface exfoliation; home leave-on products and professional peels are different contexts.

Multifunctional acidsMorning or evening

Azelaic Acid

Used in routines for uneven-looking tone, redness and blemish-prone skin, although early itching or stinging can occur.

Barrier and hydrationMorning or evening

Hyaluronic Acid

A common humectant used to support hydration alongside many active ingredients.

Barrier and hydrationMorning or evening

Ceramides

A class of lipids naturally present in the outer skin layer and commonly used in barrier-focused moisturizers.

Barrier and hydrationMorning or evening

Panthenol

A common humectant and skin-conditioning ingredient used to support moisturizing comfort; Dexpanthenol evidence has a narrower identity scope.

Barrier and multifunctionalMorning or evening

Centella Asiatica Extract

The canonical whole-plant Centella Asiatica Extract used in skin-conditioning formulas; Cica is a discovery term, not an exact ingredient identity.

AntioxidantsMorning or evening

Madecassoside

A defined Centella-derived triterpene with its own cosmetic identity; it is not Cica, whole-plant Centella extract or TECA.

Brightening and tone careMorning or evening

Alpha-Arbutin

A defined brightening ingredient with its own INCI and regulatory limits; it is not generic Arbutin, Beta-Arbutin or Hydroquinone.

Repair and age-supportMorning or evening

Bakuchiol

A defined plant-derived cosmetic ingredient that is chemically distinct from Retinol, Retinal, retinoids and Babchi oils or extracts.