Oxidative stress arises from an imbalance between reactive oxygen species (ROS) production and the body's ability to detoxify them. While often viewed as harmful, ROS also play essential physiological roles, such as cell signaling. Environmental factors and xenobiotics can increase ROS levels, leading to oxidative stress, which damages cells and tissues. Antioxidants like vitamin E, flavonoids, and polyphenols help mitigate oxidative stress. However, excessive oxidative stress is linked to various diseases, including cancer, cardiovascular disease, neurological disorders, and respiratory conditions. Oxidative stress can also be harnessed therapeutically, particularly in cancer treatment. Prooxidant agents like ascorbic acid (vitamin C) and polyphenols can induce oxidative stress to kill cancer cells. Radiation therapy, a well-established treatment, also relies on oxidative stress to damage cancer cells. Vitamin E, a key antioxidant, has been shown to reduce atherosclerosis and improve lung function. Flavonoids, such as genistein, exhibit antioxidant properties and may protect against oxidative DNA damage. However, some forms of vitamin E and flavonoids can have pro-inflammatory effects. Oxidative stress is a complex phenomenon with both harmful and beneficial roles. While it contributes to disease, it can also be used therapeutically. Understanding the balance between oxidative stress and antioxidant defenses is crucial for developing effective treatments and preventive strategies.Oxidative stress arises from an imbalance between reactive oxygen species (ROS) production and the body's ability to detoxify them. While often viewed as harmful, ROS also play essential physiological roles, such as cell signaling. Environmental factors and xenobiotics can increase ROS levels, leading to oxidative stress, which damages cells and tissues. Antioxidants like vitamin E, flavonoids, and polyphenols help mitigate oxidative stress. However, excessive oxidative stress is linked to various diseases, including cancer, cardiovascular disease, neurological disorders, and respiratory conditions. Oxidative stress can also be harnessed therapeutically, particularly in cancer treatment. Prooxidant agents like ascorbic acid (vitamin C) and polyphenols can induce oxidative stress to kill cancer cells. Radiation therapy, a well-established treatment, also relies on oxidative stress to damage cancer cells. Vitamin E, a key antioxidant, has been shown to reduce atherosclerosis and improve lung function. Flavonoids, such as genistein, exhibit antioxidant properties and may protect against oxidative DNA damage. However, some forms of vitamin E and flavonoids can have pro-inflammatory effects. Oxidative stress is a complex phenomenon with both harmful and beneficial roles. While it contributes to disease, it can also be used therapeutically. Understanding the balance between oxidative stress and antioxidant defenses is crucial for developing effective treatments and preventive strategies.