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Nootropic

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Illustration of Coffea arabica plant and seeds
Caffeine from the Coffea arabica plant is the world's most consumed nootropic.

Nootropics (/noʊ.əˈtroʊpɪks/ noh-ə-TROHP-iks or /noʊ.əˈtrɒpɪks/ noh-ə-TROP-iks;[1] but not /njuːˈtroʊpɪks/ new-TROHP-iks or /njuːˈtrɒpɪks/ new-TROP-iks,[1] which are common mispronunciations), colloquially brain supplements, smart drugs and cognitive enhancers, are natural, semisynthetic or synthetic compounds which purportedly improve cognitive functions, such as executive functions, attention or memory.

While commonly in the form of dietary supplements, nutraceuticals or energy drinks,[2] some nootropic compounds are prescription and non-prescription drugs in various countries.

In the United States, nootropics are commonly advertised with unproven claims of effectiveness for improving cognition. The Federal Trade Commission and FDA have warned manufacturers and consumers about possible advertising fraud and marketing scams concerning nootropic supplements.[3][4]

History of term

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The term nootropic is derived from Ancient Greek νόος (nóos) 'mind' and τροπή (tropḗ) 'turning'.[1][5][6]

The first documented use of "nootropic" in reference to substances purported to increase cognitive functions was by Corneliu E. Giurgea in 1972.[5][6][7] When researching a new compound, Giurgea found a spectrum of effects that did not align with any psychotropic drug category, leading to his proposal of a new category and the concept of the term nootropic.[6]

Giurgea stated that nootropic drugs should have the following characteristics:

  1. They should enhance learning and memory.
  2. They should enhance the resistance of learned behaviors or memories to conditions which tend to disrupt them (e.g. electroconvulsive shock, hypoxia).
  3. They should protect the brain against various physical or chemical injuries.
  4. They should increase the efficacy of the tonic cortical control mechanisms.
  5. They should lack the usual pharmacology of other psychotropic drugs (e.g. sedation, motor stimulation) and possess few adverse effects and low toxicity.

However, there is no globally accepted or clinical definition of a nootropic. Most compounds described as nootropic do not correspond to Giurgea's characteristics.[7]

Unproven marketing claims

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In the United States, nootropics are commonly advertised with unproven claims of effectiveness for improving cognition. Manufacturers' marketing claims for dietary supplements are usually not formally tested and verified by independent entities.[8] In 2019, the US FDA and FTC warned manufacturers and consumers about possible advertising fraud and marketing scams concerning nootropic supplement products.[3][4][9][10] The FDA and FTC stated that some nootropic products had not been approved as a prescription drug effective for any medical purpose, were not proven to be safe, and were illegally marketed in the United States under violation of the Federal Food, Drug, and Cosmetic Act.[3][4]

In 2018 in the United States, some nootropic supplements were identified as having misleading ingredients and illegal marketing.[11][12] In 2019, the FDA and FTC warned manufacturers and consumers about possible advertising fraud and marketing scams concerning nootropic supplements.[3][4]

Over the years 2010 to 2019, the FDA warned numerous supplement manufacturers about the illegal status of their products as unapproved drugs with no proven safety or efficacy at the doses listed on the products, together with misleading marketing.[3][4][9][10][13][14]

Availability and prevalence

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In 2008, stimulants, such as caffeine, were the most commonly used nootropic agent.[15] In 2016, the American Medical Association adopted a policy to discourage prescriptions of nootropics for healthy people, on the basis that the cognitive effects appear to be highly variable among individuals, are dose-dependent, and limited or modest at best.[16] Piracetam, noopept and meclofenoxate have been sold as dietary supplements.[2][17][18]

Adverse effects

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The main concern with pharmaceutical drugs and dietary supplements are adverse effects. Long-term safety evidence is typically unavailable for many nootropic compounds. Racetams, piracetam and other compounds that are structurally related to piracetam, have few serious adverse effects and low toxicity, but there is little evidence that they enhance cognition in people having no cognitive impairments.[19]

In the United States, dietary supplements may be marketed if the manufacturer can show that the supplement is generally recognized as safe, and if the manufacturer does not make any claims about using the supplement to treat or prevent any disease or condition; supplements that contain drugs or advertise health claims are illegal under US law.[20]

Types

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Central nervous system stimulants

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Systematic reviews and meta-analyses of clinical research using low doses of certain central nervous system stimulants found that these drugs may enhance cognition in healthy people.[21][22][23] In particular, the classes of stimulants that demonstrate possible cognition-enhancing effects in humans have evidence in vitro as direct agonists or indirect agonists of dopamine receptor D1 or adrenoceptor A2.[21][22][24][25] Relatively high doses of stimulants cause cognitive deficits.[24][25]

  • Amphetamine – systematic reviews and meta-analyses report that low-dose amphetamine may improve cognitive functions (e.g., inhibitory control, episodic memory, working memory, and aspects of attention) in healthy people and in individuals with ADHD.[21][22][23][25] A 2014 systematic review noted that low doses of amphetamine also improve memory consolidation, in turn leading to improved recall of information in non-ADHD youth.[23] It also improves task saliency (motivation to perform a task) and performance on tedious tasks that required a high degree of effort.[22][24][25]
  • Caffeine – a meta-analysis found an increase in alertness and attentional performance.[26][24]
  • Eugeroics (armodafinil and modafinil) – are classified as "wakefulness-promoting agents"; modafinil may increase alertness, particularly in sleep-deprived individuals, and may improve reasoning and problem solving in non-ADHD youth.[23] In a systematic review of small, preliminary studies where the effects of modafinil were examined, when simple psychometric assessments were considered, modafinil intake enhanced executive function.[27] Modafinil does not improve mood or motivation in sleep-deprived or non-sleep deprived individuals.[28]
  • Methylphenidate – a benzylpiperidine derivative that may improve working memory, episodic memory, and inhibitory control, aspects of attention, and planning latency in healthy people.[21][23] It also may improve task saliency and performance on tedious tasks.[25] At above optimal doses, methylphenidate has off–target effects that decrease learning.[29]
  • Nicotine – has been associated with improved alertness, attention, memory, and motor performance, according to a meta-analysis.[30] However, a 2020 systematic review raised concerns about potential conflicts of interest, noting industry funding in many studies and inconsistent results regarding nicotine's cognitive effects. This review found that over half of the studies published after 2010 had tobacco industry affiliations, often undisclosed.[31]

Racetams

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Main article: Racetam

Racetams, such as piracetam, oxiracetam, phenylpiracetam, and aniracetam, are often marketed as cognitive enhancers and sold over the counter.[2][17] A 2019 study found that piracetam supplements sold in the United States were inaccurately labeled.[17] Racetams are often referred to as nootropics, but this property is not well established in humans, and nootropics are not consistently found in all racetams.[32] The racetams have poorly understood mechanisms, although piracetam and aniracetam are known to act as positive allosteric modulators of AMPA receptors and appear to modulate cholinergic systems.[33]

According to the FDA,

Piracetam is not a vitamin, mineral, amino acid, herb or other botanical, or dietary substance for use by humans to supplement the diet by increasing the total dietary intake. Further, piracetam is not a concentrate, metabolite, constituent, extract or combination of any such dietary ingredient. [...] Accordingly, these products are drugs, under section 201(g)(1)(C) of the Act, 21 U.S.C. § 321(g)(1)(C), because they are not foods and they are intended to affect the structure or any function of the body. Moreover, these products are new drugs as defined by section 201(p) of the Act, 21 U.S.C. § 321(p), because they are not generally recognized as safe and effective for use under the conditions prescribed, recommended, or suggested in their labeling.[14]

Cholinergics

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Main article: Cholinergic

Some supposed nootropic substances are compounds and analogues of choline, a precursor of acetylcholine (a neurotransmitter) and phosphatidylcholine (a structural component of cell membranes).

  • Alpha-GPC – L-alpha glycerylphosphorylcholine has been studied only in the context of cognitive performance alongside other substances such as caffeine.[34]
  • Choline bitartrate – Choline bitartrate is a tartaric acid salt containing choline (41% choline by molecular weight). One meta-analysis found choline bitartrate to be ineffective at improving any measure of cognitive performance.[35]
  • Citicoline – Compound consisting of choline and cytidine. A meta-analysis found that it may be effective for improving memory and learning in older people with mild cognitive decline, and in people recovering from a stroke.[36][37]

Herbs

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  • Centella asiatica – A 2017 meta-analysis showed no significant improvement in cognitive function.[38] Clinical efficacy and safety have not been scientifically confirmed for this herb.[39]
  • Ginkgo biloba – An extract of Ginkgo biloba leaf is marketed in dietary supplement form with claims it can enhance cognitive function in people without known cognitive problems, although there is no high-quality evidence to support such effects on memory or attention in healthy people.[40][41]
  • Panax ginseng – A Cochrane review found possible "improvement of some aspects of cognitive function, behavior and quality of life", but concluded that "there is a lack of convincing evidence to show a cognitive enhancing effect of Panax ginseng in healthy participants and no high quality evidence about its efficacy in patients with dementia."[42]

Nutrients and dietary supplements

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See also

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References

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  1. ^ a b c "Shubham". Oxford English Dictionary. 2024. Retrieved January 14, 2024.
  2. ^ a b c Cohen PA, Avula B, Wang YH, Zakharevich I, Khan I (June 2021). "Five Unapproved Drugs Found in Cognitive Enhancement Supplements". Neurology. Clinical Practice. 11 (3): e303–e307. doi:10.1212/CPJ.0000000000000960. PMC 8382366. PMID 34484905.
  3. ^ a b c d e "FTC and FDA Send Warning Letters to Companies Selling Dietary Supplements Claiming to Treat Alzheimer's Disease and Remediate or Cure Other Serious Illnesses Such as Parkinson's, Heart Disease, and Cancer". US Food and Drug Administration, US Federal Trade Commission. February 11, 2019. Retrieved May 11, 2019.
  4. ^ a b c d e "Health fraud scams: Unproven Alzheimer's disease products". US Food and Drug Administration. December 22, 2018. Retrieved May 11, 2019.
  5. ^ a b Giurgea C (1972). "[Pharmacology of integrative activity of the brain. Attempt at nootropic concept in psychopharmacology]". Actualites Pharmacologiques (in French). 25: 115–156. PMID 4541214.
  6. ^ a b c Giurgea C, Salama M (January 1, 1977). "Nootropic drugs". Progress in Neuro-Psychopharmacology. 1 (3): 235–247. doi:10.1016/0364-7722(77)90046-7. The term "nootropic" (noos = mind; tropein = towards) was proposed by us (Giurgea, 1972,1973) to designate psychotropic drugs
  7. ^ a b Malík M, Tlustoš P (August 2022). "Nootropics as Cognitive Enhancers: Types, Dosage and Side Effects of Smart Drugs". Nutrients. 14 (16): 3367. doi:10.3390/nu14163367. PMC 9415189. PMID 36014874.
  8. ^ "Dietary Supplements: What You Need to Know". US Food and Drug Administration. Retrieved February 14, 2015.
  9. ^ a b Correll Jr WA (February 5, 2019). "FDA Warning Letter: Peak Nootropics LLC aka Advanced Nootropics". Office of Compliance, Center for Food Safety and Applied Nutrition, Inspections, Compliance, Enforcement, and Criminal Investigations, US Food and Drug Administration. Retrieved May 11, 2019.
  10. ^ a b Correll Jr WA (February 5, 2019). "FDA Warning Letter: TEK Naturals". Office of Compliance, Center for Food Safety and Applied Nutrition, Inspections, Compliance, Enforcement, and Criminal Investigations, US Food and Drug Administration. Retrieved May 11, 2019.
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  18. ^ Cohen PA, Avula B, Khan I (October 2022). "The unapproved drug centrophenoxine (meclofenoxate) in cognitive enhancement dietary supplements". Clinical Toxicology. 60 (10): 1156–1158. doi:10.1080/15563650.2022.2109485. PMID 35959800. S2CID 251516603.
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  29. ^ Urban KR, Gao WJ (2014). "Performance enhancement at the cost of potential brain plasticity: neural ramifications of nootropic drugs in the healthy developing brain". Frontiers in Systems Neuroscience. 8: 38. doi:10.3389/fnsys.2014.00038. PMC 4026746. PMID 24860437.
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