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Mental agility, concentration, stamina, and focus
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- Adrafinil (Olmifon) - Drug.
- Caffeine - Drug. Improves concentration, idea production, but hinders memory encoding. Large amounts produce the jitters. Caffeine is the most widely used psychoactive substance in the world, and may be susceptible to strong levels of tolerance.
- Coffee - Bean. Contains caffeine; brewed coffee is high in antioxidants.
- Nicergoline - Drug. Nicergoline is an ergoloid mesylate derivative used to treat senile dementia. It has also been found to increase mental agility and enhance clarity and perception. It increases vigilance.[7] Increases arterial flow and use of oxygen and glucose in the brain.
- Nicotine - stimulus barrier (aids in concentration). Stimulus barrier rebound effect (an unpleasant side effect).
- Cocaine - Drug.
- Methylphenidate (Ritalin) - Drug
- Dextroamphetamine - (Adderall, Dexedrine) - Drug.
- Modafinil - (Provigil) - Drug.
- Phenibut -
- Theophylline -
- Amphetamine - aids in concentration, focus and stamina. Prescribed for ADD/ADHD
- Carphedon (Phenotropil) -