Nootropics are substances people use with the aim of improving mental performance – most commonly focus, alertness, memory, learning speed, and mental stamina.
The ideal nootropic (as originally defined by neuroscientist Corneliu Giurgea) wasn’t just a “brain stimulant,” but something that supports cognition while being relatively safe and protective – enhancing function without causing major sedation, stimulation crash, or toxicity.
In practice, the modern “nootropics” umbrella includes everything from prescription wakefulness agents to research chemicals and supplements. Some have solid evidence for specific outcomes; others are mostly anecdote.
It’s important to draw a distinction between what can be considered a “true” nootropic, and simply compounds that can elicit a temporary improvement in cognitive faculties.
The potential for substances like Amphetamines in improving cognition is well recognised, however it cannot be considered to be a nootropic as it doesn’t meet the criteria as being neuro-protective and having a lasting improvement on cognition. In fact, Amphetamines (including those prescribed for the treatment of ADHD) come with a considerable risk of causing excitoxicity.
Corneliu E. Giurgea (1923–1995) was a Romanian psychologist and chemist who originated the modern concept of nootropics after synthesising Piracetam – he defined them as class of agents intended to enhance higher brain functions.
What is their goal?
Most nootropics target one of three goals:
1. Improve cognitive “state”
how awake, motivated, calm, or focused you feel
2. Improve cognitive “performance”
how well you remember, learn, plan, and solve problems
1. Improve cognitive “state”
resilience under stress, sleep loss, aging, or high workload
A key point: many compounds don’t raise intelligence in a general sense. They more often improve conditions that support cognition – like wakefulness, attention stability, or mental energy – so you can perform closer to your best.
Why do they work?
They work when they successfully influence the brain systems that limit performance. Common mechanisms include:
- Neurotransmitter modulation (dopamine/norepinephrine for drive and focus; acetylcholine for memory; glutamate/GABA for learning vs. calm)
- Arousal and sleep – wake regulation (orexin/histamine systems that control alertness)
- Synaptic plasticity support (how strongly neurons form and refine connections – core to learning)
- Brain energy and blood flow (mitochondrial output, glucose utilization, oxygen delivery)
- Stress and inflammation reduction (chronic stress and inflammation can blunt memory and executive function)
Whether a nootropic “works” for someone often depends on baseline state (sleep-deprived vs. well-rested), task type (rote memory vs. creative work), and individual biology (including genetics and tolerance).