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I have not read about such studies, perhaps such consequences are caused by the peculiarities of the body, maybe these are isolated cases. There is no definite answer to this question because not all supplements contain the same components, but all supplements must be tested before they are sold. I only use proven supplements and vitamins https://www.healthcanal.com/mental-health-behavior/best-nootropics, the ones I like the most are brain enhancement supplements. During exams, this is exactly what you need.