Free radicals are molecules, atoms and ions which have unpaired electrons in their outermost orbit. They are unstable and highly reactive, and can react with other molecules in the body, such as DNA, lipids and proteins, leading to damage and even cell death. Free radicals can be formed in the body as a result of natural metabolic processes or as a result of exposure to environmental factors including pollution, radiation and certain chemicals. They’ve been found in water sources and if consumed, can contribute to the overall oxidative stress in the body. The presence of free radicals in the water can be caused by exposure to sunlight, air and other environmental factors. In addition, free radicals can be formed during the treatment process of water, including various stages of disinfection with the use of chlorine and chloramines. It is important to note that not all free radicals are harmful with some being essential for proper cellular function and play a role in the immune system. However, an imbalance between antioxidants and free radicals in the body may lead to oxidative stress, which is linked to a number of illnesses and diseases such as cancer, heart disease and Alzheimer’s disease.