GlyMed Plus Cell Science Cell Protection Serum is the Step 2 lipid replenishment serum in the GlyMed Plus Cell Science system — a concentrated serum that replenishes the critical skin lipids indigenous to a healthy young skin barrier, addressing the lipid depletion that is a primary driver of barrier compromise, sensitivity, dehydration, and accelerated aging in mature and environmentally stressed skin.The formula delivers a targeted blend of skin-identical lipids including Linoleic Acid, Ceramides, and plant-derived essential fatty acids that directly replenish the lipid components of the stratum corneum lost to aging, UV exposure, harsh cleansing, and environmental damage. Saccharomyces Ferment Lysate supports cellular repair and renewal. Squalane provides additional non-greasy lipid conditioning. Antioxidants protect the replenished lipids from oxidative degradation. Applied before the Ultra Hydro Gel and Cell Protection Balm, this serum re-establishes the lipid scaffold that allows the subsequent products to perform optimally.Apply after cleansing and before Ultra Hydro Gel and Cell Protection Balm. Available at Beauty Riche — authorized GlyMed Plus retailer with same-day shipping.