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Siegall et al., 1994

This group includes, among others, derivatives of piracetam, which is an authorized pharmaceutical in some countries in Europe but has not been approved as a drug by the US FDA [41]

doi: 10.1016/S0008-6363(98)00343-5

There is a G.A.R

Another amino acid, glutamine, has very little research on its possible nootropic effects, but one literature review suggests that supplementation may be able to improve mood and cognition in cases of high-altitude hypoxic stress (low levels of oxygen in your body from living in or visiting high-altitude regions).71 72 Vitamins and minerals Often affecting mood and cognition, fatigue and brain fog are highly prevalent symptoms of vitamin and mineral deficiencies