Nootropics, often referred to as "smart drugs" or "cognitive enhancers," are substances that can improve cognitive function, particularly executive functions, memory, creativity, or motivation, in healthy individuals. Here's an exhaustive list categorized by their chemical families:

1. Racetams:

• Piracetam: The original racetam, it enhances learning and memory.
• Aniracetam: Known for its anxiolytic effects and ability to enhance creativity.
• Oxiracetam: Stimulating and promotes wakefulness.
• Pramiracetam: Enhances long-term memory and recall.
• Phenylpiracetam: Stimulating and enhances physical performance.
• Coluracetam: May enhance vision and treat anxiety.
• Fasoracetam: Potential treatment for ADHD due to its modulation of GABA.

2. Choline Sources:

• Alpha GPC: A bioavailable form of choline that can enhance cognitive function and physical performance.
• Citicoline (CDP-Choline): Enhances memory and protects the brain.
• Choline Bitartrate: Basic choline source for nootropic stacking.

3. Ampakines:

• Sunifiram: Enhances learning and memory.
• Unifiram: Similar to Sunifiram but more potent.

4. Vitamin B Derivatives:

• Sulbutiamine: A synthetic derivative of thiamine (Vitamin B1) that can improve mood and energy levels.
• Pyritinol: A semi-synthetic derivative of Vitamin B6, used for cognitive enhancement.

5. Peptides:

• Noopept: Enhances memory, learning, and mood.
• Semax: A neuroprotective agent that can also enhance cognitive function.
• Selank: An anxiolytic peptide that can enhance cognitive function.

6. Natural Nootropics:

• Bacopa Monnieri: An adaptogen that can reduce anxiety and improve memory.
• Lion's Mane Mushroom: Supports neurogenesis and improves cognitive function.
• Ginkgo Biloba: Enhances memory and has neuroprotective properties.
• Rhodiola Rosea: An adaptogen that can reduce fatigue and improve mood.
• Ashwagandha: Reduces stress and anxiety.

7. Smart Drugs:

• Modafinil: A wakefulness-promoting agent that can enhance alertness and cognitive function.
• Adrafinil: A prodrug to Modafinil; promotes wakefulness.
• Armodafinil: A longer-lasting version of Modafinil.

8. Other Nootropics:

• Phenylalanine: An amino acid that can improve mood and energy.
• L-Theanine: Found in tea, it can promote relaxation without sedation.
• Creatine: Enhances energy metabolism in the brain and has neuroprotective properties.
• Tianeptine: An atypical antidepressant that can improve mood and cognitive function.

9. Catecholaminergics:

• Methylphenidate (Ritalin): Increases dopamine and norepinephrine in the brain, enhancing focus and attention.
• Adderall: A combination of amphetamine salts that increase dopamine and norepinephrine.

10. Others:

• Huperzine A: Inhibits acetylcholinesterase, leading to increased acetylcholine levels in the brain.
• PRL-8-53: Enhances learning and memory.

This list is by no means exhaustive, and the effects of nootropics can vary between individuals. Always consult with a healthcare professional before starting any new supplement regimen.