Abstract: The invention provides a method for the prevention and/or activation of defense mechanisms in the human body against conditions, disorders or diseases relating to the presence of free radicals, such as; environmental pollution, aging or smoking by rising the administration to a mammal, namely a human being, of an effective amount of a phytonutrient-and-citric-based edible dosage, during or after tobacco consumption and which is intended to prevent pathologies, conditions, disorders or diseases relating to the presence of free radicals in the human body. Likewise, the therapeutic method of the invention enables activation of defense mechanisms in the human body to reduce conditions, disorders or diseases relating to the presence of free radicals in the body.