Where do They Come From?
They are produced when the body gets exposed to harmful ultraviolet rays (from the sun), or gamma rays (from radioactive material), or X-rays. To a certain extent, we also tend to get these radicals in our body due to pollution, like cigarette smoke, car exhaust, and industrial fumes. However, even breathing in pure oxygen tends to promote them. Human body tends to undergo around 10,000 free radicals hits everyday. So, escaping them is almost impossible. But, one can take measures to protect the body from their damage.