Biogenic Amines: A Comprehensive Reference
1. Identity and Chemical Classification
Biogenic amines (also known as biologically active amines) are low-molecular-weight organic compounds produced in biological systems by enzymatic decarboxylation of certain amino acids. Examples include dopamine, histamine, norepinephrine, serotonin, and tyramine. The term encompasses a structurally diverse group of nitrogenous compounds that share a common origin from amino acid precursors but differ substantially in their chemical architecture, receptor targets, and physiological effects.
Biogenic amines are nitrogenous compounds with low molecular weight, a chemical structure that contains one or more amino groups (–NH₂), and have biological activity in living beings. They have an aliphatic, aromatic, or heterocyclic structure.
The most commonly encountered biogenic amines in the context of food, supplementation, and human physiology are organized by chemical class:
- Aliphatic (polyamine) subclass: Putrescine, cadaverine, spermine, and spermidine are examples of aliphatic biogenic amines.
- Aromatic subclass: Tyramine, 2-phenylethylamine (β-PEA), agmatine, and dopamine are aromatic biogenic amines.
- Heterocyclic subclass: Histamine, tryptamine, and serotonin (5-HT) are heterocyclic biogenic amines.
- Catecholamines: Dopamine, epinephrine (adrenaline), and norepinephrine (noradrenaline) are catecholamines, which contain a catechol structure and are considered biogenic amines.
- By amine count: Depending on the number of amino groups in the molecule, biogenic amines can be monoamines (phenylethylamine and tyramine), diamines (histamine, putrescine, and cadaverine), or polyamines (spermine, spermidine, and agmatine).
The most important biogenic amines found in food are histamine, tyramine, putrescine, cadaverine, β-phenylethylamine, agmatine, tryptamine, serotonin, spermidine, and spermine. These dietary amines are classified according to their chemical structure as aromatic amines (histamine, tyramine, serotonin, phenylethylamine, and tryptamine), aliphatic diamines (putrescine and cadaverine), and aliphatic polyamines (agmatine, spermidine, and spermine).
Key individual amino acid precursor relationships include: histamine is produced from the amino acid histidine by histidine decarboxylase; serotonin is a neurotransmitter derived from the amino acid tryptophan; and in eukaryotes, polyamine synthesis begins with ornithine, which is synthesized through the urea cycle from arginine. The decarboxylation of ornithine catalyzed by ornithine decarboxylase (ODC) is the rate-limiting step in polyamine synthesis.
2. Natural Sources
Biogenic amines are compounds that are commonly found in food and beverages such as meat, fish, cheese, vegetables, wine, and other fermented foods. Their occurrence depends on whether they arise endogenously within animal and plant tissues or via microbial fermentation.
2.1 Fermented Foods
Biogenic amines can be produced by microbes in fermented foods, such as fermented soybean products, vegetables, cheeses, sausage, and fish. In the fermentation of foods, two significant components can be identified: bioactive substances generated during fermentation and microorganisms involved during fermentation. Among the bioactive substances generated are organic acids, bioactive peptides, exopolysaccharides, conjugated linoleic acid, biogenic amines, isoflavones, phytoestrogens, nattokinase, and N-nitrosamines.
- Fish and fish products: Fish and fish products show the highest levels of biogenic amines. This applies mainly to fish species containing significant amounts of free histidine, which can be transformed into histamine under appropriate conditions. In mackerel, herring, tuna, and sardines, other amines have been detected in addition to histamine, including putrescine, cadaverine, tyramine, spermine, and spermidine.
- Cheese: In pasteurised milk, histamine occurs in the range of 0.3–0.7 ppm, while in fermented dairy products it constitutes a tenfold larger proportion. Cheeses are the next most common food products associated with poisoning caused by histamine after fish and fish products.
- Fermented vegetables: In fermented vegetable products, some amounts of biogenic amines, especially putrescine, were found in sauerkraut juice, pickled vegetables (kimchi), and fermented soybeans. A paste product, miso, which is formed by fermenting cereal and soybean seeds with the coaction of mould, yeast, and bacteria, has been found to contain tyramine and histamine.
- Unfermented plant foods: High levels of biogenic amines may also occur in tomatoes and bananas (tyramine, tryptamine), plums (tyramine), spinach (histamine), and legumes.
- Wine and beer: The presence of nine biogenic amines — tryptamine, β-phenylethylamine, putrescine, cadaverine, histamine, serotonin, tyramine, spermidine, and spermine — has been investigated in red and white wine samples.
- Bread (sourdough): Putrescine, cadaverine, histamine, and tyramine are the most frequently reported biogenic amines in bread. Quantitatively, the amine contents are usually low, normally below 10 mg/kg.
2.2 Acacia rigidula (Dietary Supplement Context)
Extracts of Acacia rigidula leaves are used in weight-loss products with little or no published data about their potential biological effects. Chemical investigations on authenticated A. rigidula plant material established methods for the quantitative determination of several phenethylamine, tyramine, and tryptamine derivatives. Studies revealed significant differences in the amine profiles of authenticated plant materials and dietary supplements, and β-methylphenethylamine — a non-natural compound — was found in 9 of the 21 dietary supplement products examined.
2.3 Endogenous vs. Exogenous Origin
There is a distinction between endogenous and exogenous biogenic amines. Endogenous amines are produced in many different tissues — for example, adrenaline in the adrenal medulla and histamine in mast cells and liver. The exogenous amines are directly absorbed from food in the intestine, and alcohol can increase the absorption rate.
3. Common Preparation Forms
Biogenic amines reach consumers through several preparation forms:
- Dietary food sources: The most prevalent route of exposure is through consumption of fermented foods such as aged cheese, cured meats, wine, beer, fish sauce, kimchi, sauerkraut, miso, natto, and tempeh — all of which naturally accumulate biogenic amines during microbial fermentation.
- Isolated supplement forms: High-purity spermidine trihydrochloride (hpSPD) represents a novel, isolated supplement form that has been studied in early clinical trials. Wheat germ extracts standardized for spermidine content have also been used in intervention studies.
- Plant-extract-based supplements: Extracts of Acacia rigidula leaves are used in weight-loss products sold in vitamin shops and over the internet. Such products introduce phenylethylamine and tyramine derivatives.
- Polyamine-enriched functional foods: In human intervention studies, 30 healthy male volunteers were asked to eat polyamine-rich and ready-to-eat traditional Japanese food (natto) for 12 months. Natto with high polyamine content was used as the delivery vehicle.
4. Traditional and Historical Use
Biogenic amines as a defined chemical category were not conceptualized in pre-modern medicine; however, the fermented and plant-derived foods that concentrate them have millennia of use across multiple cultures.
4.1 East Asian Fermented Foods
More regionally specific traditional fermented foods that contain biogenic amines include meats such as nham; cereals such as mawè, jalebi, borde, kunu-zaki; and legumes such as cheonggukjang, natto, miso, jang, ugba, doenjang, koji, and meju. Natto (Japan), miso (Japan/Korea), doenjang (Korean fermented soybean paste), and cheonggukjang have been produced and consumed for centuries in East Asia, valued for their nutritional and putative health-promoting properties. Miso, formed by fermenting cereal and soybean seeds with the coaction of mould, yeast, and bacteria, has long been a dietary staple and has been found to contain tyramine and histamine.
4.2 Korean Kimchi
Kimchi is a traditional Korean fermented vegetable product with biogenic amines produced during fermentation. Current regulations have been evaluated for their adequacy in ensuring safety of fermented vegetable products. Kimchi's fermentation — traditionally involving cabbage, radish, and fermented seafood-based seasonings (jeotgal and aekjeot) — has been practiced for over a millennium as a food preservation technique.
4.3 European Fermented Products
Aged European cheeses, cured sausages (salami, pepperoni), and fermented fish sauces (garum in ancient Rome) concentrated high levels of biogenic amines and have been consumed across Mediterranean and European cultures for thousands of years. High levels of tyramine can be found in aged cheese, sausages, and alcoholic beverages.
4.4 Traditional Recognition of Vasoactive Effects
While historical practitioners lacked modern biochemistry, the physiological effects of tyramine-rich foods — particularly aged cheese causing flushing and headache in susceptible individuals — were recognized clinically well before the molecular mechanisms were understood. The formal identification of the "cheese reaction" in patients taking monoamine oxidase inhibitors emerged from clinical reports in the 1960s: persons receiving an MAO inhibitor who ingest foods with a high tyramine content (such as cheese) experience the MAO inhibitor blocking the metabolic degradation of tyramine, leading to high circulating tyramine levels, catecholamine release, and serious hypertension — the reaction now commonly known as the "cheese reaction" or "cheese effect."
5. Key Constituents and Active Compounds
Although "biogenic amines" is a class rather than a single ingredient, each principal member has distinct chemistry and physiological roles. The most pharmacologically and nutritionally significant are described below.
5.1 Histamine
Histamine is produced from the amino acid histidine by histidine decarboxylase and is metabolized by the combined actions of histamine methyltransferase and MAO. High concentrations of histamine and histamine decarboxylase are found in neurons in the hypothalamus that send sparse but widespread projections to almost all regions of the brain and spinal cord. The central histamine projections mediate arousal and attention. Peripherally, histamine is the principal mediator of type-I allergic responses, acting at H1, H2, and H3 receptors to produce vasodilation, increased vascular permeability, smooth-muscle contraction, and gastric acid secretion.
5.2 Tyramine
Tyramine is a monoamine derived by decarboxylation of tyrosine. It acts primarily as an indirect sympathomimetic — releasing catecholamines (particularly norepinephrine) from adrenergic neurons — leading to vasoconstriction and elevated blood pressure. Tyramine demonstrates vasoconstrictor activity, causing headaches, hypertension, flushing, gastrointestinal distress, and edema.
5.3 Serotonin (5-Hydroxytryptamine)
Serotonin, an endogenous amine, is a neurotransmitter derived from the amino acid tryptophan and is involved in regulating mood, sleep, appetite, and sexuality. Like the other monoamines, serotonin undergoes reuptake and is transported back into the presynaptic terminal via the serotonin transporter (SERT). Monoamine oxidase is the only enzyme used for its degradation.
5.4 β-Phenylethylamine (β-PEA)
β-Phenylethylamine is a trace amine derived from phenylalanine by aromatic amino acid decarboxylase. It acts as a neuromodulator, influencing dopamine and norepinephrine signaling. MAO-B more effectively metabolizes phenylethylamine and benzylamine.
5.5 Polyamines: Putrescine, Spermidine, and Spermine
The natural polyamines spermine and spermidine, and their precursor putrescine, are ubiquitous low-molecular-weight aliphatic amines containing multiple amino groups. Spermine and spermidine have four and three amino groups respectively, with molecular weights of approximately 200 and 140 g/mol. Putrescine, a precursor of polyamine, has two amines and is therefore referred to as a diamine. Natural polyamines are small, positively charged molecules that are ubiquitously found within organisms and cells. They exert numerous intracellular functions and have been implicated to protect against several age-related diseases.
5.6 Agmatine
Agmatine is a cationic molecule produced through arginine decarboxylation by bacteria and plants. Its exogenous addition exerts significant effects on glucose metabolism in obese animal models, as well as cardioprotective effects.
6. Established Mechanisms of Action
6.1 Neurotransmitter and Neuromodulator Activity
Biogenic amines such as dopamine, histamine, norepinephrine, serotonin, and tyramine function in the body as neurotransmitters and relay signals between neurons across synapses to impact mental functions, blood pressure, body temperature, appetite, and several other physiological processes. The levels of biogenic amines in the body are regulated for proper functioning of these various physiological processes.
6.2 Catabolism via MAO and COMT
Monoamine oxidases (MAOs) are mammalian flavoenzymes (EC 1.4.3.4) that catalyze the oxidative deamination of biogenic and dietary amines, monoamine hormones, and neurotransmitters such as serotonin, dopamine, norepinephrine, and epinephrine, as well as a number of trace amines, such as tyramine, tryptamine, and 2-phenylethylamine. Two isoforms of MAO (MAO-A and MAO-B) have been identified, differing in substrate specificities, inhibitor affinity, relative expression, and tissue localization. MAO-A has high affinity for serotonin and to a lesser degree norepinephrine. MAO-B more effectively metabolizes phenylethylamine and benzylamine. Epinephrine, dopamine, tryptamine, and tyramine are metabolized to varying degrees by both MAO-A and MAO-B.
The two major enzymes involved in the catabolism of catecholamines are monoamine oxidase (MAO) and catechol O-methyltransferase (COMT). Both neurons and glia contain mitochondrial MAO and cytoplasmic COMT.
Monoamine oxidases A and B are mitochondrial bound isoenzymes which catalyze the oxidative deamination of dietary amines and monoamine neurotransmitters. The rapid degradation of these molecules ensures the proper functioning of synaptic neurotransmission and is critically important for the regulation of emotional behaviors and other brain functions. The byproducts of MAO-mediated reactions include several chemical species with neurotoxic potential, such as hydrogen peroxide, ammonia, and aldehydes.
6.3 Intestinal Detoxification: DAO and Other Oxidases
Low doses of biogenic amines are quickly metabolized in the digestive tract to less bioactive products. The enzymes involved in the detoxification of amines in the body are monoamine oxidase (MAO), diamine oxidase (DAO), and polyamine oxidase. Normal biogenic amine intake does not cause illness as intestinal amine oxidases break down and detoxify the biogenic amines.
6.4 Polyamine-Specific Mechanisms: Autophagy and Epigenetic Regulation
The polycations' ability to boost autophagy and to dampen oxidative stress has been linked to longevity of yeast, worms, fruit flies, mice, and human immune cells. Polyamines have been implicated in memory and cognitive function, and reportedly act as neuromodulators by latching onto NMDA receptors.
Increased polyamine intake elevated blood spermine levels, inhibited aging-associated pro-inflammatory status (increases in lymphocyte function-associated antigen-1 [LFA-1] on immune cells), suppressed aberrant gene methylation, and extended the lifespan of mice.
Spermidine improves systemic arginine and nitric oxide bioavailability, resulting in a decrease in systemic blood pressure and engagement of anti-inflammatory and anti-oxidative stress pathways in various human and animal models.
7. Body Systems Associated with Biogenic Amines
7.1 Central Nervous System
Biogenic amines function in the body as neurotransmitters and relay signals between neurons across synapses to impact on mental functions, blood pressure, body temperature, appetite, and several other physiological processes. The role of histamine H3 receptors in learning and memory demonstrates that H3-receptor antagonists could have a role in the management of memory disorders such as Alzheimer's disease. Dopamine is integral to reward, motivation, and motor control; norepinephrine mediates the stress response and attention; serotonin regulates mood, sleep, and appetite.
7.2 Cardiovascular System
Some aromatic amines such as tyramine, tryptamine, and β-phenylethylamine demonstrate vasoconstrictor activity, while others such as histamine and serotonin introduce a vasodilator effect in veins, capillaries, and arteries. Spermidine has functional implications in cardiovascular protection and immune system regulation.
7.3 Gastrointestinal System
Certain foods contain biogenic amines that can add to the amounts naturally present in the body. The gut is a major site of biogenic amine exposure and metabolism. Diamine oxidase in the intestinal mucosa represents the primary barrier against systemic absorption of food-derived biogenic amines. It seems feasible that other amines, by acting as competitive substrates, could interfere with histamine degradation by the intestinal enzyme diamine oxidase (DAO).
7.4 Immune System
Histamine is also the major active substance released from mast cells. Histamine at H1 and H2 receptors mediates acute allergic and anaphylactic responses, modulates T-cell differentiation, and governs inflammatory chemotaxis. Polyamines such as spermine modulate immune cell function and suppress chronic inflammation associated with aging.
7.5 Endocrine and Metabolic Systems
The administration of either spermidine or spermine has been shown to be effective for improving glucose homeostasis and insulin sensitivity and reducing adiposity and hepatic fat accumulation in diet-induced obesity animal models.
8. Scientific Evidence by Area of Use
8.1 Cognitive Function and Brain Aging (Spermidine)
Evidence strength: Preliminary to moderate in humans; mechanistic basis well-established in preclinical models.
A few small studies hint that foods rich in spermidine keep people sharper into old age, and several clinical trials are testing out spermidine supplements as a treatment for cognitive impairment.
In an exploratory study, 90 older adults were stratified for dietary spermidine intake by a questionnaire, and a positive correlation was reported between spermidine intake and cortical thickness and hippocampal volume. In a separate blinded but placebo-less trial of older adults in Austria, spermidine was provided in two concentrations in wheat rolls; the group receiving the higher spermidine rolls performed significantly better in cognitive tests. A placebo-controlled trial enrolling 30 older adults also found improvement in cognitive tests in the spermidine arm.
After comprehensive screening from 1,726 records, three studies were included in one mini-review on spermidine and cognition. All studies were randomized controlled trials in adults aged 60–96. The reviewers noted these were studies with low spermidine doses and a small number of participants; further evidence is needed to assess its actual effect.
In aging fruit flies, spermidine-rich feeding inhibited the development of age-dependent memory impairment by restoring polyamine levels in the brain and enhancing autophagy. Increased external administration of spermidine is suggested to promote longevity and autophagy in worms, flies, yeast, and mice.
In humans, the level of spermidine declines with aging. Emerging lines of evidence indicate that supplementation of spermidine favors the improvement of memory performance and cognitive function. However, the current body of human RCT data is small, and firm conclusions cannot yet be drawn.
8.2 Cardiovascular Disease and Longevity (Polyamines)
Evidence strength: Epidemiological and preclinical evidence is encouraging; dedicated large-scale RCTs are underway but not yet complete.
Increased polyamine levels, including through enhanced dietary intake, have been consistently linked to improved health and reduced overall mortality. In preclinical models, dietary supplementation with spermidine prolongs lifespan and health span.
To evaluate the relationship between dietary polyamine intake and all-cause and cardiovascular disease (CVD)-related mortality in the Korean population, a total of 37,715 participants were included in a population-based cohort study. Dietary polyamine intake was calculated using average spermidine and spermine content and daily consumed food components from 12 food groups. Cox proportional hazards examined associations between dietary polyamine and mortality. Among the participants, 2,080 all-cause and 483 CVD-related deaths occurred. The lowest risk of all-cause and CVD-related mortality was found in the highest tertile of fruit, vegetables, legume, nut, and seafood-derived spermidine and spermine intake after adjusting covariates.
Spermidine, a naturally occurring polyamine and caloric-restriction mimetic, has been linked to improved longevity in epidemiological studies and shown to enhance autophagy, mitochondrial function, and cardiovascular ageing in preclinical models. A major trial is investigating whether high-dose spermidine improves cardiac remodelling, exercise capacity, muscle mass, and systemic inflammation in elderly patients with coronary artery disease (CAD). This is a single-centre, randomised, double-blind, placebo-controlled superiority trial. Researchers randomised 187 patients aged ≥ 65 years with CAD in a 1:1 ratio to receive either 24 mg/day spermidine or placebo for 48 weeks. Trial completion is anticipated in August 2026.
8.3 Anti-Inflammatory and Epigenetic Effects (Dietary Polyamines)
Evidence strength: One human interventional study; mechanistic data primarily from animal models.
To test the effects of increased polyamine intake by humans, 30 healthy male volunteers were asked to eat polyamine-rich and ready-to-eat traditional Japanese food (natto) for 12 months. Another 27 male volunteers served as a control group. The volunteers' age ranged from 40 to 69 years (median 48.9 ± 7.9). The estimated increases in spermidine and spermine intakes were 96.63 ± 47.70 and 22.00 ± 9.56 µmol per day in the intervention group, while no changes were observed in the control group. The results suggest that dietary polyamine contributes to human health and longevity, potentially through suppression of aging-associated aberrant DNA methylation changes.
8.4 Glucose Metabolism and Metabolic Health
Evidence strength: Preclinical (animal model) data only; no robust human clinical trials available.
Emerging evidence has suggested that exogenous polyamines are able to induce longevity in mice and that spermidine supplementation exerts cardioprotective effects in animal models. Furthermore, the administration of either spermidine or spermine has been shown to be effective for improving glucose homeostasis and insulin sensitivity and reducing adiposity and hepatic fat accumulation in diet-induced obesity mouse models. These findings have not yet been replicated in robust human clinical trials.
8.5 Safety-Focused Research: Histamine Intolerance
Evidence strength: Well-characterized mechanistic and clinical condition; considerable evidence on adverse effects and sensitive subpopulations.
Tyramine and phenethylamine have been identified as the initiators of hypertension during treatment with monoamino oxidase inhibitor drugs and of dietary-induced migraine in susceptible individuals. The accumulation of biogenic amines in food depends on the availability of free amino acids and the presence of microorganisms with decarboxylase activity on amino acids.
In general, increased sensitivity against biogenic amines is due to a weakened enzymatic amine degradation caused by genetic or acquired impairment of MAO, DAO, and histamine-N-methyltransferase (HNMT) function. Impairment of DAO activity either due to genetic predisposition, gastrointestinal diseases, or due to medication with DAO inhibitors results in high histamine blood levels, which consequently overload the internal hepatic inactivation system and leads to histamine intolerance, causing numerous symptoms mimicking an allergic reaction.
Putrescine and cadaverine significantly delayed histamine degradation at all tested concentrations in vitro. The greatest effect was observed when putrescine or cadaverine concentrations were 20-fold higher than that of histamine, with its degradation reduced by 70 and 80%, respectively. These results demonstrate that other biogenic amines interfere with histamine metabolization by DAO in vitro, the extent depending on the substrate. These findings could explain why susceptibility to dietary histamine is so variable and account for the discrepancies in the scientific literature regarding the amount of histamine that triggers adverse health effects.
8.6 Neurological and Mood Effects (Serotonin, Dopamine, Phenylethylamine)
Evidence strength: Well-established for endogenous pools; dietary contribution to CNS levels is indirect and complex.
The monoamine biogenic amines — serotonin, dopamine, norepinephrine — are established neurotransmitters whose dysregulation underlies multiple mood and psychiatric disorders. Pharmacological agents that modulate their synthesis, release, reuptake, or catabolism are among the most widely used drugs in medicine. However, the extent to which dietary intake of these amines specifically elevates CNS levels is constrained by their metabolism in the gut and liver before systemic absorption. Monoamine oxidase (MAO) breaks down biogenic amines and prevents excessive resorption. Prolonged excessive MAO activity may be conducive to mitochondrial damage and neurodegenerative disturbances. The development of MAO inhibitors has led to important breakthroughs in the therapy of several neuropsychiatric disorders, ranging from mood disorders to Parkinson's disease.
9. Dosage Forms and Dosages Reported in Studies
The following dosages are reported from the studies cited in this article. They are not recommendations.
- Spermidine (pilot RCT, cognitive decline): Researchers are testing spermidine supplements in clinical trials for cognitive aging. A small pilot study used 1 mg spermidine daily in adults with subjective cognitive decline and hinted at a slight advantage in memory performance over those taking placebo.
- Spermidine (safety/tolerability RCT in older men): This first investigation into the safety of a novel, high-purity spermidine trihydrochloride supplement (hpSPD) in humans enrolled 37 healthy men (age 50–70 years; BMI 18.5–28 kg/m²) administered either hpSPD or placebo. Evidence from clinical trials of pure spermidine supplements has been limited because pure spermidine for human administration has not previously been available. The dose tested was 40 mg/day. Substantial changes in serum and urine polyamine concentrations were not observed following supplementation, suggesting effective homeostatic control. These findings suggest that hpSPD at 40 mg/day for up to 28 days is safe and well-tolerated in healthy older men.
- Spermidine (POLYCAD cardiovascular trial): Researchers randomised 187 patients aged ≥ 65 years with coronary artery disease in a 1:1 ratio to receive either 24 mg/day spermidine or placebo for 48 weeks.
- Dietary polyamine intervention (natto): Estimated increases in spermidine and spermine intakes were 96.63 ± 47.70 and 22.00 ± 9.56 µmol per day in the intervention group consuming polyamine-rich natto for 12 months.
10. Safety Considerations and Drug Interactions
10.1 General Toxicity Thresholds
Dietary exposure to foods containing high levels of biogenic amines is associated with many adverse health effects, such as migraines, elevated blood pressure, and tachycardia. Biogenic-amine-mediated toxicity may occur at levels a hundred times below regulatory and suggested toxic doses, depending on an individual's sensitivity and factors such as alcohol consumption and certain medications.
Biogenic amines, specifically histamine or tyramine exceeding 100 mg/kg, and phenylethylamine exceeding 30 mg/kg, can potentially pose a health risk to individuals consuming fermented foods.
The clearest manifestations of utilization of large doses of biogenic amines are nausea, vomiting, respiratory crisis (dyspnoea), hot flushes, oral burning, withdrawal of intestinal smooth muscles bringing on stomach spasms, and hyper- or hypotension.
10.2 Histamine Intoxication (Scombroid Poisoning)
Histamine intoxication is characterized by pruritus, rash, urticaria, and the most incriminated foods are fish and cheese containing excessive amounts of histamine. Histamine intolerance, with a wide range of nonspecific gastrointestinal, neurological, cardiovascular, respiratory, and skin symptoms, is prevalent with even low levels of dietary exposure in sensitive individuals.
The triggering of symptoms derived by an excessive consumption of histamine was described for the first time over 60 years ago, and was first called scombroid fish poisoning, because the symptoms appeared mainly after the consumption of fish from the Scombridae and Scomberesocidae families, which have naturally high histidine contents.
10.3 Tyramine and the "Cheese Reaction" with MAO Inhibitors
The symptoms of tyramine intoxication are increased blood pressure, migraine, and hypertensive crisis in individuals under monoamine oxidase inhibitor treatment. A low-tyramine diet is needed to prevent its interaction with MAO inhibitors.
Pressor agents other than tyramine can be present in food. Vasogenic amines also include phenylethylamine and tryptamine. Histamine is a biogenic amine often found in foods, and excess intake can lead to hypertension.
Tyramine and histamine are often associated with food intoxication, responsible for the "cheese reaction" and "histamine or scombroid food poisoning," respectively.
10.4 Synergistic Amine Potentiation
The toxic effects of histamine are enhanced by the presence of other biogenic amines such as putrescine and cadaverine. This synergistic effect means that foods containing multiple biogenic amines simultaneously may cause symptoms at histamine concentrations that would normally be tolerated when histamine appears alone.
10.5 Individual Susceptibility Factors
Adverse effects are also possible when metabolization mechanisms are deficient — due to genetic factors or certain diseases — or when inhibited by amine oxidase inhibitor drugs. Exogenous amines absorbed from food are rapidly degraded by oxidases, but in allergic people taking inhibitors of these enzymes or after the consumption of very large amounts of amines, the neutralisation process is inhibited or slowed, resulting in the accumulation of amines in the body.
10.6 Regulatory Limits
Histamine is the only biogenic amine with regulatory limits set by the European Commission in fish and fishery products, because it can lead to a fatal outcome. The European Union, through the European Food Safety Authority (EFSA), recommends a maximum histamine level of 200 mg/kg for general fishery products and 400 mg/kg specifically for fish sauces, whereas the US Food and Drug Administration (FDA) considers scombroid toxin-forming fish safe for consumption if histamine levels do not exceed 50 mg/kg.
Histamine is a biogenic amine and a food safety hazard, and it is the only biogenic amine regulated by statute or hazard analysis and critical control point guidance. Histamine and tyramine are considered the most toxic and food safety relevant biogenic amines, and fermented foods are of particular concern due to associated intensive microbial activity and potential for biogenic amine formation. Despite their strong influence on food quality, there is no specific regulation regarding biogenic amine food content with the exception of histamine in fishery products.
10.7 Alcohol as a Modifying Factor
Alcohol can increase the absorption rate of biogenic amines. This means that consuming fermented foods with high amine content alongside alcoholic beverages may substantially amplify exposure and risk of adverse effects, particularly in individuals with compromised DAO or MAO activity.
10.8 Safety of Isolated Spermidine Supplementation
At 40 mg/day of high-purity spermidine (hpSPD), no significant changes in clinical, lipid, chemistry, or hematological parameters were observed compared to placebo. Compliance was high, and no study product-related adverse events were reported. Spermidine and spermine are present in food at very low levels and do not pose any health risks under normal dietary conditions. However, human safety data for isolated, high-dose supplementation remain limited and primarily short-term.
11. Strength of Evidence: Summary
- Well-established (high-quality evidence): The roles of biogenic amines as endogenous neurotransmitters and neuromodulators (serotonin, dopamine, norepinephrine, histamine); adverse effects of histamine and tyramine at high dietary doses; the cheese reaction/tyramine–MAOI interaction.
- Moderate evidence: Epidemiological associations between higher dietary polyamine (spermidine/spermine) intake and reduced all-cause and cardiovascular mortality; anti-inflammatory effects of dietary polyamines in human intervention studies.
- Preliminary/emerging (small RCTs, positive signals): Spermidine supplementation for cognitive aging. The available trials enrolled small numbers, used low doses, and were of short duration — precluding definitive conclusions.
- Preclinical only (animal/in vitro): Metabolic effects (glucose homeostasis, insulin sensitivity, adiposity reduction) of spermidine and spermine; agmatine's cardioprotective and antidiabetic effects.
References
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