--- title: "Antioxidant defense activation" description: "Assess endogenous antioxidant pathway responses in skin models." image: "https://cosmetic-labs.com/wp-content/uploads/antioxidant-defense-service-1200x1200-1.webp" --- # Antioxidant defense activation > Assess endogenous antioxidant pathway responses in skin models. Source: https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/antioxidant-defense Created: 2025-03-07T12:48:24+00:00 Modified: 2026-10-25T18:46:36+00:00 Author: Emilie SCHOL Antioxidant defense activation | Cosmetic Labs ## What is Antioxidant defense activation? Antioxidant defense activation testing evaluates how cosmetic ingredients affect endogenous antioxidant pathways in skin models. Measurements of glutathione, antioxidant enzymes, and oxidative damage help distinguish pathway activation from demonstrated protection during a defined pollutant challenge. ### Why do you need this service? Use antioxidant-defence studies to investigate endogenous pathways in skin models. Glutathione, enzyme activity and pathway measurements can be combined with damage endpoints to assess responses to a defined challenge. ## Be the first company on this service page No published company profiles are linked to Antioxidant defense activation or its more specific services yet. Explore the service categories or add an explicitly supported capability to your company profile. [List your company](https://cosmetic-labs.com/account/companies/new) Definition ## Antioxidant defense activation This service investigates cellular antioxidant responses rather than only the chemical radical-scavenging capacity of an ingredient. It can examine whether treatment changes protective pathways and whether that change is accompanied by less oxidative injury in the selected model. ### Cellular response measurements Keratinocyte or fibroblast studies may assess NRF2 signaling, glutathione status, and antioxidant enzymes such as superoxide dismutase, catalase, or glutathione peroxidase. Expression, abundance, and enzyme activity are distinct measurements. Pathway activation and downstream markers - Reactive oxygen species measurements with interference controls - Lipid peroxidation or other damage endpoints - Inflammatory markers and cell viability ### Challenge-based protection studies Defined exposures may include particulate matter, ozone, cigarette smoke extract, or other contaminants relevant to the brief. The laboratory should specify the challenge composition and whether treatment occurs before, during, or after exposure. Lower oxidative damage alongside a suitable antioxidant response can support a focused mechanism in the model. Enzyme induction alone does not demonstrate protection, and pollutant studies do not automatically establish UV or blue-light benefits. Results should describe the tested endpoint rather than promise broad shielding from environmental damage. Applications ## Studying endogenous antioxidant responses A pollutant or oxidative challenge should be chosen for the ingredient question and model. Compare treated and reference conditions to distinguish a baseline pathway response from protection during the challenge. Greater pathway activation can also reflect increased stress. Glutathione measurements and SOD or catalase assays provide different information from a reporter or target-gene measurement. Keep enzyme activity separate from abundance, and consider viability and assay interference before interpreting a lower oxidative signal. The results can guide candidate selection and further mechanism studies. A protective conclusion should relate to measured damage in the tested conditions; it cannot be inferred from activation alone or extended to all environmental exposures. Do not assume a standard fold-change or improvement percentage. ExplorationLearn more about Antioxidant & Redox StudiesInvestigate antioxidant and redox responses through chemical scavenging, cellular defence and oxidative-damage assays with model-specific interpretation. Explore another Antioxidant & Redox Studies page on cosmetic-labs.com. #### [Oxidative stress efficacy testing](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/oxidative-stress) Assess antioxidant activity and oxidative damage in chemical or skin-cell models through radical scavenging, redox pathways and protection endpoints. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/oxidative-stress) #### [Free radical scavenging](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/radical-scavenging) Compare radical-scavenging activity using defined chemical assays such as DPPH or ABTS, with skin protection requiring separate biological evidence. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/radical-scavenging) #### [DPPH/ABTS radical quenching](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/antioxidant) Compare DPPH and ABTS radical quenching in defined chemical systems using absorbance measurements, separately from evidence of skin-cell protection. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/antioxidant) #### [Nrf2 pathway activation](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/nrf2-pathway) Investigate Nrf2 pathway responses in skin-cell models using nuclear localisation, reporter activity and downstream gene or protein measurements. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/nrf2-pathway) #### [SOD/Catalase activation](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/sod-catalase) Measure ingredient effects on SOD and catalase activity in skin-cell models, distinguishing enzyme function from expression and chemical scavenging. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/sod-catalase) #### [GSH synthesis stimulation](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/gsh-synthesis) Investigate glutathione production using GSH, GSSG and synthesis-related measurements to separate new synthesis from recycling and consumption. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/gsh-synthesis) #### [Lipid peroxidation block](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/lipid-peroxidation) Measure lipid oxidation products and lipid-sensitive probes to assess whether an ingredient limits peroxidation in a defined chemical or cellular model. [Check this service](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/lipid-peroxidation) #### [Mitochondrial protection](https://cosmetic-labs.com/services/clinical/efficacy/redox-antioxidant-defense/mitochondrial-protection) Assess mitochondrial function during a defined oxidative challenge using respiration, membrane potential, ATP content and complementary damage markers. 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