The immune system helps to protect us from harmful bacteria, viruses and fungi. It also helps to repair damaged tissue. Poor diet, alcohol, caffeine and cigarettes can all add up and decrease the effectiveness of the immune system. Once your immune system has been compromised your body cannot properly defend or repair itself, becoming prone to fatigue, illness and infections. The immune system defence cells are mainly produced by the spleen and thyroid helping to create a barrier against illness and infections called free radicals. Free radicals are produced in high numbers when the body is exposed to poor nutrition. Some vitamins and minerals can help to protect the body against free radicals.
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To put it simply, nootropics are supplements designed with the intent of boosting brain power while maintaining brain health. Some refer to nootropics as “smart drugs” or the kind of pill that the protagonist in the film Limitless took that allowed him to maximise brain power and more. 
The truth of the matter is, nootropics are simply formulations that contain specific ingredients or concentrations of compounds that have been studied for their brain benefits. Most of the formulas you find in popular nootropics contain natural ingredients