Cosmetic active
Hyaluronic acid
A widely used humectant that supports hydration and a supple, comfortable-looking complexion.
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Y.5 library
Ingredients, explained clearly
What they are, their role within a formula and how to fit them into a sensible routine. Cosmetic information without medical promises.
Y.5 editorial content · Updated 10 August 2026
Cosmetic active
Argireline®
A cosmetic peptide designed to address the appearance of lines associated with facial expression.
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Cosmetic active
Citrustem®
A plant-derived cosmetic active used in formulas targeting visible skin quality and a more even-looking complexion.
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Cosmetic active
Vitamin C
A family of antioxidant ingredients used to support radiance and help protect the formula and skin from oxidative stress.
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Cosmetic active
Peptides
Molecules made from amino acids, selected in cosmetics for specific functions related to skin appearance.
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Cosmetic active
Proteoglycans
Macromolecules naturally present in the extracellular matrix and used in cosmetics within hydrating, visible-firmness formulas.
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