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Most of nootropic substances found in food or plant components (herbs, roots, beans, bark, etc..) Available at grocery stores and are used as nutritional supplements. Some nootropics are drugs used to treat people with learning difficulties, cognitive mechanisms, including degradation of the nerves (Alzheimer's and Parkinson's are some examples), and for cases of oxygen deficit to prevent hypoxia, and so on. These drugs can have use in humans. With some nootropics the effects are subtle and gradual, for example, most nerve growth inducers, and may take weeks or even months before any cognitive improvement is noticed. At the other end of the spectrum are nootropics which have immediate effects, profound, and obvious. While scientific studies support some of the benefits claimed, it is worth noting that many of the claims attributed to a certain variety of nootropics have not been formally tested.