The purpose of nutrition/ fasting/ supplements or any other method behind weight control is to manipulate hormones into a negative or positive metabolic state (fat balancing).
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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