What is cross-linked hyaluronic acid
L'HyaCare® Filler CL, in INCI Sodium Hyaluronate Crosspolymer, is hyaluronic acid cross-linked: instead of remaining free, the chains are linked together to form a three-dimensional structure. It’s the same idea behind dermatological gels, applied to a cosmetic active ingredient for use on the skin’s surface.
How it works: the reservoir effect
Cross-linking changes how the molecule behaves. A free chain holds water and releases it quickly; a cross-linked network holds more and releases it gradually, like a reservoir that empties slowly. The result is hydration that lasts throughout the day and a more pronounced plumping effect on superficial lines, because the structure has volume of its own that free chains don’t have.
What it does and how to use it
It works on superficial wrinkles and loss of firmness, and is applied morning and evening to skin that is still damp. It’s designed to be used alongside non-cross-linked forms: low-molecular-weight chains deliver hydration to the upper layers, while the crosspolymer creates a reservoir on the surface. Together, they address two different timeframes for the same need, making this the most complete solution for dehydration.
What its presence in an INCI tells you
It is the most expensive and technically complex form of hyaluronic acid to produce, and its presence in an INCI says something about the formula: it means the formulation goes beyond the simplest available form of hyaluronic acid, combining different forms to address multiple mechanisms.
Frequently asked questions
What is the difference between cross-linked and non-cross-linked hyaluronic acid?
A free chain holds water and releases it quickly; the crosslinked network holds more and releases it gradually, for hydration that lasts throughout the day.
How is cross-linked hyaluronic acid applied?
Apply morning and evening to still-damp skin.
Can it be used together with other forms of hyaluronic acid?
Yes, it’s specifically designed to be used alongside non-crosslinked forms: the low-molecular-weight chains deliver hydration to the upper layers, while the crosspolymer creates a reservoir on the surface.
Does cross-linked hyaluronic acid plump wrinkles?
It has a more pronounced plumping effect on superficial lines, because the crosslinked structure has its own volume, which free chains don’t have.
The selection of ingredients is curated by Elisa Avalle, founder of LeLang and a dermocosmetics specialist. Each formula is created and developed in LeLang laboratories.
