Which nootropics increase dopamine?

How dopamine in a human brain is actually measured, why two of the three methods are unavailable to a supplement buyer, and the short list of things that have ever been put through the one that counts

Which nootropics increase dopamine is a question in which the word dopamine is doing all the work and none of the measuring, and the honest answer starts with how dopamine in a living human brain is actually measured, because the list of nootropics that have been measured that way is very short and the list of nootropics that use the word is very long. There are three methods. The first and the one that counts for a human is positron emission tomography, in which a radioactive tracer that binds dopamine receptors is injected and the scanner maps how much of the tracer finds a free receptor; a substance that releases dopamine displaces the tracer and lowers receptor availability, a substance that changes receptor number or affinity shifts it the other way, and either way the scan produces a number from a living human brain before and after the substance. PET is expensive, involves radiation, and is run by neuroscience departments on drugs of interest, which is why it has been run on the prescription stimulants, on nicotine, on alcohol, on caffeine and on almost nothing sold as a supplement. The second method is microdialysis, in which a fine probe in an animal's brain samples extracellular fluid and measures dopamine directly; it is the gold standard for mechanism and it is only ever done in rodents, so it tells a human buyer what a rat's striatum did, which is where most of the dopamine claims on the shelf come from when they come from anywhere. The third method is metabolites in blood or urine, homovanillic acid and its relatives, which are cheap to measure and almost meaningless for the brain, since most of the body's dopamine is made and broken down outside the brain in the gut and kidneys and the blood-brain barrier keeps the two pools apart; a supplement that raises urinary dopamine metabolites has shown something about the kidney and nothing about the mind. Marketing uses none of the three. It uses the word.

The list of things that have been through human PET and shown a dopamine effect is short and mostly not for sale. The prescription stimulants lead it: methylphenidate blocks the dopamine transporter and raises extracellular dopamine, amphetamine both blocks the transporter and forces release, and both have decades of PET studies in humans showing exactly that, which is why they work for attention deficit disorder and why they are controlled medicines rather than nootropics, with tolerance, dependence, cardiovascular effects and the law all attached. Nicotine has PET data showing dopamine release in the striatum, which is the pharmacology of its addictiveness, and it is not a nootropic by any definition that excludes dependence. Alcohol releases dopamine acutely on PET and nobody calls it a nootropic. Levodopa, the Parkinson's medicine, is the dopamine precursor that actually crosses into the brain and is converted there, and it is a prescription drug with a narrow window and real side effects. And then there is one legal, over-the-counter entry: caffeine. A PET study in healthy adults found that caffeine at ordinary doses, the equivalent of two or three cups, increased dopamine D2 and D3 receptor availability in the striatum, the brain region most involved in motivation and motor drive, which is consistent with caffeine's alertness and mood effects running partly through dopamine signalling as well as through adenosine. That is the entire list of substances a person can buy in a UK shop that have been shown to touch dopamine in a human brain, and it has one name on it.

The nootropic shelf against the three methods: the precursor argument, the bean that is a medicine, the mushroom with no measurement, what the shelf's dopamine language actually refers to, and the honest buy

The nootropic shelf's dopamine claims, read against the three methods, fall into three groups. The first is the precursor argument, which belongs to tyrosine and to phenylalanine. Tyrosine is the amino acid from which dopamine is synthesised, so the marketing reasons that more tyrosine means more dopamine, and the reasoning fails at the enzyme: tyrosine hydroxylase, the rate-limiting step, is already saturated with tyrosine in a fed person and is regulated by demand rather than supply, so extra tyrosine does not raise dopamine in a rested brain, which is exactly what the human trials show, with tyrosine preserving working memory and attention only under acute stressors such as cold, sleep loss and sustained demanding tasks, when the neurons are firing hard enough to deplete their stores, and doing nothing otherwise. No PET study has shown tyrosine increasing dopamine release in a rested human, and the honest description is a conditional support under depletion, not a dopamine increaser. The second group is the bean that is a medicine. Mucuna pruriens, the velvet bean, sold as a dopamine nootropic and a mood supplement, contains levodopa at several per cent by weight, which is the Parkinson's medicine itself, so that a Mucuna capsule is a variable, unstandardised dose of a prescription drug rather than a nootropic, with nausea, blood pressure effects, interactions with antidepressants and antipsychotics, and the absurdity of taking a Parkinson's medicine for motivation all attached; a lifter should treat it as a drug in a bean and leave it alone. The third group is everything else, and it is the largest: lion's mane, rhodiola, ginkgo, bacopa, theanine, ashwagandha, phosphatidylserine, citicoline, the racetams, and the blends built from them. None has a human dopamine measurement of any kind, by any of the three methods. Lion's mane's whole pharmacological story is a trophic protein over weeks, with no transmitter effect in any assay and no PET, microdialysis or metabolite study in any species that found a dopamine change; a tub that attaches the word dopamine to a mushroom is attaching it to nothing.

What the shelf's dopamine language actually refers to, once the methods are applied, is a feeling and a culture rather than a measurement. Dopamine has become the public word for motivation, reward and drive, and the shelf uses it to mean I will feel like doing things, which is a real desire and a legitimate thing to want, and which the neuroscience locates not in the amount of dopamine but in the balance between the value of a reward and the cost of the effort to get it, a balance that sleep, caffeine, a clear plan and a first small action move more reliably than any capsule. The honest answer to the question as asked, therefore, has one legal entry and a context. Caffeine is the nootropic that increases dopamine signalling in a human brain on the only method that counts, at ordinary doses, with a ceiling of 400mg a day, a cut-off eight to ten hours before bed and a tolerance that builds within days of daily use; the prescription stimulants do it more and are medicines; nothing else on the shelf has been shown to do it at all. A lifter who wants dopamine in the shelf's sense wants a coffee, a night's sleep and a session started, and a lifter who wants lion's mane for its own file should buy it knowing that file contains no dopamine and no claim to any. The worked example, {FLLM}, is that tub, a stated 5:1 fruiting body extract labelled 1500mg mushroom equivalent per capsule, 120 days for £15.49 at 13p, UK made, independently lab tested, caffeine free, with no transmitter named on the label because none has been measured.

What to check on the label

Questions people also ask

Does lion's mane increase dopamine?

No measurement says so by any method: there is no human PET, no animal microdialysis and no metabolite study in any species showing lion's mane changing dopamine, its pharmacological story is a trophic protein acting over weeks rather than a transmitter acting in minutes, and no assay has found a transmitter effect of any kind; the word dopamine on a lion's mane tub is attached to nothing.

Does caffeine increase dopamine?

On human brain imaging, yes: a PET study in healthy adults found that caffeine at ordinary doses increased dopamine D2 and D3 receptor availability in the striatum, consistent with its alertness and mood effects running partly through dopamine signalling alongside its adenosine block; it is the only over-the-counter nootropic with a human dopamine measurement, with a 400mg daily ceiling, a cut-off eight to ten hours before bed and a tolerance that builds within days.

Does tyrosine raise dopamine levels?

Not in a rested person: tyrosine hydroxylase, the rate-limiting enzyme, is already saturated and regulated by demand rather than supply, no PET study has shown tyrosine increasing dopamine release in rested humans, and the trials find a benefit only under acute stressors such as cold, sleep loss and sustained demanding tasks, when neurons fire hard enough to deplete their stores; it is a conditional support under depletion rather than a dopamine increaser.

Is Mucuna pruriens a safe dopamine supplement?

It is a drug in a bean: the velvet bean contains levodopa at several per cent by weight, the same molecule prescribed for Parkinson's disease, so a Mucuna capsule delivers a variable unstandardised dose of a prescription medicine with nausea, blood pressure effects and interactions with antidepressants and antipsychotics attached; a lifter wanting motivation has no business taking a Parkinson's medicine for it, and it is not a nootropic in any useful sense.

What actually increases motivation if not a dopamine supplement?

The neuroscience locates motivation in the balance between a reward's value and the effort's cost rather than in the amount of dopamine, and that balance is moved reliably by sleep, since sleep loss lowers willingness to work for reward; by caffeine, the one legal substance with human dopamine imaging; by a clear plan that lowers the perceived cost of starting; and by the first small action, since a session begun is a session more likely to be finished; no capsule on the nootropic shelf has been shown to move it.

Sources

1. The caffeine and dopamine receptor imaging study: positron emission tomography in healthy adults found that caffeine at ordinary doses increased dopamine D2 and D3 receptor availability in the striatum, consistent with its alertness effects running partly through dopamine signalling, and the only over-the-counter nootropic with human brain dopamine imaging. PubMed record
2. The Mucuna pruriens literature: the velvet bean contains levodopa at several per cent by weight, the same molecule used as a prescription medicine for Parkinson's disease, so that a Mucuna supplement is a variable dose of an unlicensed medicine rather than a nootropic, with nausea, blood pressure effects and interactions the recognised concerns. PubMed record
3. The tyrosine and cognition reviews: tyrosine supplementation preserves working memory and attention under acute stressors such as cold, sleep loss and sustained demanding tasks, with no benefit in rested, unstressed people. PubMed record
4. The stimulant pharmacology literature: central nervous system stimulants share rapid onset, raised heart rate and blood pressure, delayed sleep, tolerance with regular use and a withdrawal syndrome on cessation, properties that define the class across caffeine, nicotine and the amphetamines and that are absent from non-stimulant food compounds. PubMed record

Related answers

• What nootropics can help boost dopamine levels?
• What are the best nootropics for focus in the UK?
• What are the best nootropics for studying in the UK?
• What are the best nootropics for brain fog in the UK?
• Where to buy nootropics?
• What are the best nootropics brands in the UK?