Free radicals and reactive oxygen species (ROS) are continuously produced in the human body and are involved in the pathology of various diseases, including cancer, atherosclerosis, malaria, rheumatoid arthritis, and neurodegenerative disorders. ROS such as the superoxide radical (O₂⁻) and hydrogen peroxide (H₂O₂) are generated in the brain and nervous system, and their accumulation can lead to oxidative stress, which damages biomolecules like DNA, lipids, and proteins. Antioxidant defenses, including superoxide dismutase (SOD), catalase, and glutathione peroxidase, help neutralize these radicals. However, excessive ROS can cause tissue injury, which may further generate more ROS, worsening the damage. Emerging technologies for assessing oxidative damage, such as measuring products like 8-hydroxydeoxyguanosine (8-OHdG), isoprostanes, and altered amino acids, are aiding in understanding disease mechanisms and evaluating antioxidant efficacy. ROS are produced by various enzymes and processes, including the Fenton reaction, and can contribute to oxidative stress, which is linked to numerous diseases. Free radicals like hydroxyl (OH·), nitric oxide (NO·), and peroxyl radicals (RO₂·) play significant roles in cellular damage, DNA mutation, and protein oxidation. Oxidative stress is characterized by an imbalance between ROS production and antioxidant defenses, leading to cell damage and disease. Antioxidants, such as vitamins C and E, flavonoids, and phytochemicals, are crucial in mitigating oxidative damage. The role of ROS in diseases like Parkinson's, cardiovascular disease, and cancer is well-documented, and their measurement is essential for understanding disease progression and evaluating antioxidant interventions. Oxidative damage to DNA, lipids, and proteins is a key factor in many diseases, and the measurement of oxidative damage products is vital for assessing the effectiveness of antioxidant therapies. Techniques such as high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC/MS) are used to detect markers like 8-OHdG and isoprostanes. These markers help in evaluating the extent of oxidative damage and the impact of antioxidant supplementation. The development of reliable assays for measuring oxidative damage is crucial for future antioxidant studies and interventions. Overall, understanding the role of ROS and oxidative stress in disease is essential for developing effective strategies to prevent and treat oxidative-related conditions.Free radicals and reactive oxygen species (ROS) are continuously produced in the human body and are involved in the pathology of various diseases, including cancer, atherosclerosis, malaria, rheumatoid arthritis, and neurodegenerative disorders. ROS such as the superoxide radical (O₂⁻) and hydrogen peroxide (H₂O₂) are generated in the brain and nervous system, and their accumulation can lead to oxidative stress, which damages biomolecules like DNA, lipids, and proteins. Antioxidant defenses, including superoxide dismutase (SOD), catalase, and glutathione peroxidase, help neutralize these radicals. However, excessive ROS can cause tissue injury, which may further generate more ROS, worsening the damage. Emerging technologies for assessing oxidative damage, such as measuring products like 8-hydroxydeoxyguanosine (8-OHdG), isoprostanes, and altered amino acids, are aiding in understanding disease mechanisms and evaluating antioxidant efficacy. ROS are produced by various enzymes and processes, including the Fenton reaction, and can contribute to oxidative stress, which is linked to numerous diseases. Free radicals like hydroxyl (OH·), nitric oxide (NO·), and peroxyl radicals (RO₂·) play significant roles in cellular damage, DNA mutation, and protein oxidation. Oxidative stress is characterized by an imbalance between ROS production and antioxidant defenses, leading to cell damage and disease. Antioxidants, such as vitamins C and E, flavonoids, and phytochemicals, are crucial in mitigating oxidative damage. The role of ROS in diseases like Parkinson's, cardiovascular disease, and cancer is well-documented, and their measurement is essential for understanding disease progression and evaluating antioxidant interventions. Oxidative damage to DNA, lipids, and proteins is a key factor in many diseases, and the measurement of oxidative damage products is vital for assessing the effectiveness of antioxidant therapies. Techniques such as high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC/MS) are used to detect markers like 8-OHdG and isoprostanes. These markers help in evaluating the extent of oxidative damage and the impact of antioxidant supplementation. The development of reliable assays for measuring oxidative damage is crucial for future antioxidant studies and interventions. Overall, understanding the role of ROS and oxidative stress in disease is essential for developing effective strategies to prevent and treat oxidative-related conditions.