Xanthone

Xanthone: A Comprehensive Encyclopedic Reference

1. Identity: Chemical and Botanical Classification

Chemical Identity

Structurally, xanthones (9H-xanthan-9-one) are heterocyclic compounds with oxygen and a γ-pyrone component. The chemical formula of xanthone is C₁₃H₈O₂, and its IUPAC designation is 9H-xanthen-9-one. They are densely packed with a two-benzene ring structure. The parent xanthone scaffold thus consists of a dibenzo-γ-pyrone tricyclic ring system, and biologically active derivatives arise when substituent groups — hydroxyl, methoxyl, prenyl, or glycosyl moieties — are attached at various positions around this nucleus.

The carbons in xanthones are numbered from their nucleus and biosynthetic construct. They have mixed shikimate-acetate (higher plants) and acetate-malonate (lower organisms) biosynthetic origins, which influence their classification. Based on the level of oxidation of the C-ring, they are classified into monomers, dimers, and heterodimers. While based on the level of oxygenation or the type of ring residue, they can be categorized into mono-, di-, tri-, tetra-, penta- and hexa-oxygenated xanthones, bis-xanthones, prenylated and related xanthones, xanthonolignoids, and other miscellaneous types.

The specific functional groups at positions C-1, C-3, C-6, and C-8 of the xanthone molecule are crucial in defining the biological activity of α-mangostin. These positions are implicated in modulating various pathways, such as anti-inflammatory and anti-cancer mechanisms. The presence of hydroxyl groups, in particular, enhances antioxidant capacity, allowing α-mangostin to scavenge free radicals effectively, thereby exerting cytoprotective effects.

Natural Sources

Xanthones are chemical substances found in higher plants, marine organisms, and lower microorganisms. The most prevalent naturally occurring sources of xanthones are those belonging to the families Caryophyllaceae, Guttiferae (Clusiaceae), and Gentianaceae. Lichens, fungi, plants belonging to the Polygalaceae, Moraceae, Gentianaceae, and Guttiferae families, and ferns all contain these tricyclic secondary chemicals.

The most commercially and scientifically prominent source is Garcinia mangostana L. (mangosteen), a member of the Guttiferae/Clusiaceae family. Garcinia mangostana L. (Clusiaceae) is a tropical tree native to Southeast Asia known as mangosteen, whose fruits possess a distinctive and pleasant taste that has granted them the epithet of "queen of the fruits." The seeds and pericarps of the fruit have a long history of use in the traditional medicinal practices of the region. Particular emphasis has been placed on their rich content of prenylated and oxygenated xanthones, a class of polyphenols which is only synthesized within a small group of higher plants, fungi, and lichens. The majority of studies focus on xanthones from the pericarp of mangosteens, where α-mangostin and γ-mangostin were found to be the major constituents.

The occurrence of mangostins in other parts of the mangosteen tree or fruit, such as aril segments, heartwood, stem, and seed, has also been reported by several authors. Other notable botanical sources of xanthones beyond mangosteen include species of Gentiana, Hypericum, Swertia, and members of the Polygalaceae family. The first documented xanthone derivative to be extracted from a plant — specifically from Gentiana lutea roots — was gentian, in 1821.

Fungi are the primary source of xanthone dimers, with 145 compounds originating from fungal species. Xanthone dimers, a distinctive class of natural metabolites renowned for their unique structures, are abundantly present in a diverse array of angiosperms, fungi, and lichens.

Key Named Xanthones and Preparations

Of the 200 known xanthones, nearly 50 are found in mangosteen. The major xanthones in mangosteen are alpha-mangostin, beta-mangostin, gamma-mangostin, and methoxy-beta-mangostin, with the most abundant being alpha-mangostin. Other notable xanthone compounds identified in the mangosteen fruit include garcinone E, gartanin, and the dimeric xanthone garcinoxanthone series. Mangiferin — a C-glucoside xanthone found in mango (Mangifera indica), as well as in gentian and other species — is another widely studied member of the class.

In commerce, xanthones from mangosteen are available as standardized pericarp extracts in capsule, tablet, and liquid (juice blend) form. Attention on mangosteen fruits as an ingredient of functional products is growing, particularly due to their rich content of xanthones. Whereas mangosteen products containing puree from the entire fruit of Garcinia mangostana L. are considered as novel food in the European Union, such products are widely used in the US due to their high antioxidant potential and traditional consumption in their countries of origin.

2. Traditional and Historical Use

Early reports of the traditional uses of infusions and decoctions of its peels and seeds to treat gastrointestinal and urinary tract infections, and as anti-scorbutic, laxative, and anti-fever agent, date from almost two hundred years ago.

Traditional healers in countries such as Thailand, Malaysia, and Indonesia utilized various parts of the mangosteen fruit, particularly the rind (pericarp), for its purported health benefits. The rind was often dried and ground into powders or brewed into decoctions to address a variety of ailments. Since mangosteen pericarp and the whole fruit have been used in Southeast Asia for centuries in the treatment of several diseases such as diarrhoea, dysentery, infections of the skin, mycosis, inflammation, cholera, and fever, manifold medicinal preparations have been developed.

The rind and leaves have been used medicinally to treat thick mucus, cystitis, diarrhea, dysentery, fever, and thrush, as well as intestinal and skin conditions such as eczema and pruritus. Concentrates of mangosteen bark have been used medicinally to treat genitourinary disorders, including gonorrhea and stomatitis.

The seeds and pericarps of the fruit have a long history of use in traditional medicinal practices in Indonesia, and beverages containing mangosteen pulp and pericarps are sold worldwide nowadays as popular nutritional supplements. α-Mangostin is a xanthone present in the pericarp of Garcinia mangostana Linn., which is mentioned in Ayurveda and is a widely used functional food supplement.

Preparations varied by region and purpose. The rind has been used for internal and external infections, and poultices can be used to treat skin conditions; an extract of mangosteen pulp has even been used to control fever. Outside Southeast Asia, mangosteen reached the Caribbean and South America, where it was used in folk medicine: preparations of the rind were reported to be used as a tonic for fatigue and as a digestive aid. Palm sugar farmers in Indonesia traditionally used mangosteen pericarp for preserving palm sap, suggesting additional non-medicinal ethnobotanical uses rooted in its recognized antimicrobial properties.

3. Key Constituents and Active Compounds

Primary Xanthones in Garcinia mangostana

The main phytochemicals present in the species are isoprenylated xanthones, a class of secondary metabolites with multiple reports of biological effects, such as antioxidant, pro-apoptotic, anti-proliferative, antinociceptive, anti-inflammatory, neuroprotective, hypoglycemic, and anti-obesity.

• α-Mangostin (alpha-mangostin): The most studied xanthone is α-mangostin (α-MG), for which anti-oxidant, anti-proliferative, pro-apoptotic, anti-inflammatory, anti-carcinogenic, and anti-microbial activities have been reported. α-Mangostin, which was first isolated from the mangosteen in 1855, is a competitive antagonist of the histamine H₁ receptor and possesses many biological properties, such as anti-inflammatory, anti-oxidative damage, and antioxidant activities.
• γ-Mangostin (gamma-mangostin): Gamma-mangostin is the second most abundant xanthone in mangosteen pericarp. On the basis of pharmacological data, it is suggested that alpha-mangostin and gamma-mangostin are a histaminergic and a serotonergic receptor blocking agent, respectively. Gamma-mangostin has also been studied extensively for its effects on cancer cell lines and in neurological models.
• β-Mangostin (beta-mangostin) and Garcinone E: Beta-mangostin and garcinone E are among the minor xanthones isolated from the mangosteen. Garcinone E has been the subject of cytotoxicity research in hepatocellular carcinoma models.
• Gartanin: Another prenylated xanthone identified in the mangosteen pericarp and studied for antiproliferative activity.
• Mangiferin: A C-glucosyl xanthone found primarily in mango and Gentiana spp. The isolation of 1,3,6,7-tetrahydroxyxanthone and the skeletal structure of mangiferin were documented as early as 1957.

Structural Basis for Activity

These metabolites are widely distributed in nature and, because of their chemical makeup and position of the substituent groups on the aromatic ring, they have a variety of biological actions. The prenylation of xanthones — addition of isoprene-derived substituents at specific ring positions — substantially increases lipophilicity and is a key structural determinant of their biological potency and cell membrane penetration. Oxygenation patterns (number and position of hydroxyl and methoxyl groups) govern antioxidant capacity via radical scavenging and chelation of metal ions.

4. Mechanisms of Action

Antioxidant Mechanisms

The presence of hydroxyl groups enhances antioxidant capacity, allowing α-mangostin to scavenge free radicals effectively, thereby exerting cytoprotective effects. In cell culture research, α-mangostin (at 10 and 30 µM) potentially inhibited lipid peroxidation (LPOs) and oxyhemoglobin oxidation pathways and enhanced the cell-protective ability in H₂O₂-induced acute oxidative stress in erythrocytes. Hydroethanolic mangosteen extract (320 µg/mL) for up to four hours was shown to protect and improve DNA damage of H₂O₂-induced oxidative stress in human leukocytes.

Anti-Inflammatory Mechanisms

Two xanthones, alpha- and gamma-mangostins, were isolated from the fruit hull of G. mangostana, and both significantly inhibited nitric oxide (NO) and PGE₂ production from lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. The IC₅₀ values for the inhibition of NO production by alpha- and gamma-mangostins were 12.4 and 10.1 microM, respectively. The data show that the inhibitory activities of alpha- and gamma-mangostins are not due to direct inhibition of iNOS enzyme activity. On the other hand, expression of iNOS was inhibited by alpha- and gamma-mangostins in LPS-stimulated cells.

The anti-inflammatory effects of α-mangostin include its modulation of nuclear factor-κB (NF-κB) related pathways, the suppression of mitogen-activated protein kinase activation, increased macrophage polarization to M2, reduced inflammasome occurrence, increased Sirtuin 1 and 3 expression, the reduced expression of inducible nitric oxide synthase, the production of nitric oxide and prostaglandin E2, the reduced expression of Toll-like receptors, and reduced proinflammatory cytokine levels.

Molecular docking data showed binding energy of α-mangostin with NF-κB and COX proteins. In LPS-induced RAW 264.7 cells, the measurement of cytokine production and prevention of translocation of NF-κB and inhibition of COX-1 and -2 enzymes were demonstrated.

Receptor Antagonism

A pharmacological study of G. mangostana showed that alpha-mangostin is a selective and competitive H₁ receptor antagonist, while gamma-mangostin is a selective and competitive 5-hydroxytryptamine 2A (5-HT2A) receptor antagonist. Alpha-, beta-, and gamma-mangostin suppressed the upstream degranulation (release of allergic mediators) process in rat basophilic leukemia cells.

In a rodent neuroblastoma model, γ-mangostin provoked an increase in mRNA levels of receptors for serotonin (5-HT2A/2C), muscarin (M4), histamine (H1), and bradykinin (BK2); authors suggested that this xanthone acted as antagonist of these receptors, thereby reducing transduction in primary afferent nociceptors.

Pro-Apoptotic Mechanisms (Anticancer)

An extensive analysis of in vitro and in vivo studies elucidates the multifaceted mechanisms underlying α-mangostin's cytotoxicity, apoptosis induction through both intrinsic and extrinsic pathways, and modulation of key cellular processes implicated in cancer progression in a diverse array of cancer cells. It causes mitochondrial dysfunction, activates caspases, and regulates autophagy, endoplasmic reticulum stress, and oxidative stress, enhancing its anti-cancer efficacy. The ability of α-mangostin to inhibit cell proliferation, modulate cell cycle progression, and induce apoptosis is linked to its effects on key signaling pathways, including Akt, NF-κB, and p53.

The induction of apoptosis in human promyelocytic leukemia (HL-60) cells by α-mangostin was mediated by the activation of caspase-9 and caspase-3, but not caspase-8, indicating that α-mangostin may be involved in the mitochondrial apoptotic pathway. Parameters of mitochondrial dysfunction, including swelling, loss of membrane potential (Δψm), decrease in intracellular ATP, ROS accumulation, and cytochrome c/AIF release, were observed within 1 or 2 hours following treatment.

Cardiometabolic Mechanisms

Research suggests that α-mangostin exerts promising anti-obesity, hepatoprotective, antidiabetic, cardioprotective, antioxidant, and anti-inflammatory effects on various pathways in cardiometabolic diseases. The anti-obesity effects of α-mangostin include the reduction of body weight and adipose tissue size, the increase in fatty acid oxidation, the activation of hepatic AMP-activated protein kinase and Sirtuin-1, and the reduction of peroxisome proliferator-activated receptor γ expression.

5. Scientific Evidence by Area of Use

5.1 Antioxidant Effects

In vitro and in vivo evidence: Xanthones have documented antioxidant, antibacterial, antifungal, anti-inflammatory, antitumor, antiplatelet aggregation, antithrombotic, and vasorelaxant properties. They also prevent oxidative damage to LDL in cell-based assays.

Human (clinical) evidence: One study investigated the absorption and antioxidant effects of a xanthone-rich mangosteen liquid in healthy human volunteers after the acute consumption of 59 mL of the supplement. The liquid contained mangosteen, aloe vera, green tea, and multivitamins. Results indicated that α-mangostin was bioavailable, with observed Cmax at tmax of around 1 h. The antioxidant capacity measured with the oxygen radical absorbance capacity (ORAC) assay was increased with a maximum effect of 18% after 2 h, and the increased antioxidant level lasted at least 4 h.

Two human studies have reported that ingestion of a mangosteen juice blend or a xanthone-rich mangosteen product decreased serum CRP levels and increased ORAC values, respectively. However, increased levels of several pro-inflammatory mediators were also observed. Evidence strength: Preliminary; results are from small, short-duration trials, several of which used multicomponent commercial products, making it impossible to isolate the contribution of xanthones specifically.

5.2 Anti-Inflammatory Effects

Preclinical evidence: In an in vivo study, alpha-mangostin significantly inhibited mice carrageenan-induced paw edema. In conclusion, alpha- and gamma-mangostins from G. mangostana are bioactive substances with anti-inflammatory effects. Arthritic DBA/1J mice were orally administered with two doses of α-mangostin (10 and 40 mg/kg) daily, for 33 days. Alpha-mangostin significantly decreased the clinical score in the short term at both doses and decreased the histopathological score at the higher dose. This improvement was accompanied by a reduction in serum levels of anti-collagen IgG2a autoantibodies and of the production of multiple pro-inflammatory chemokines and cytokines, including IL-6 and IL-33, in the joints.

Alpha-mangostin also exhibited an anti-oxidant effect decreasing the NADPH oxidase activity and lipid peroxidation and preserving the levels of reduced glutathione in the arthritic joints.

Human evidence: Information about the anti-inflammatory activity and metabolism of α-mangostin in human cells is limited. α-MG attenuated TNF-α and IL-8 secretion by various human cell lines but increased TNF-α output by both quiescent and LPS-treated primary human monocyte-derived macrophages. This divergence between results in transformed cell lines and primary human immune cells highlights the complexity of translating findings. Evidence strength: Predominantly preclinical (animal and cell culture); well-characterized molecular mechanisms, but robust human clinical trial data on anti-inflammatory outcomes remains lacking.

5.3 Anticancer Effects

Preclinical evidence: α-Mangostin, a xanthone isolated from the pericarp of mangosteen fruit, has been shown to induce apoptosis in various cancer cell lines and to exhibit antitumor activity in a mouse mammary cancer model. In α-mangostin-treated cells, induction of mitochondria-mediated apoptosis was observed. On cell-cycle analysis, G1-phase arrest, increased p21cip1 expression and decreases in cyclins, cdc(s), CDKs, and PCNA were observed.

γ-Mangostin showed concentration- and time-dependent cytotoxic effects on HT29 (colorectal adenocarcinoma) cells. Microscopic observation showed that γ-mangostin induced cellular swelling and the appearance of apoptotic bodies, characteristic of apoptosis. Flow cytometry analysis showed an increase of hypodiploid cells in γ-mangostin-treated HT29 cells, while enhancement of intracellular peroxide production was detected.

Moreover, α-mangostin exhibits synergistic effects with conventional chemotherapeutic agents, suggesting its utility in combination therapies. Research covers various cancer types, including colon cancer, glioblastoma, melanoma, oral squamous cell carcinoma, and pancreatic cancer.

Mangosteen xanthones (gartanin and α-mangostin) inhibited the growth of cancer cell lines derived from different stages of human urinary bladder cancer via induction of autophagy and apoptosis.

Human (clinical) evidence: Alpha-mangostin is a potent phytochemical and has received attention specifically for use as an anticancer agent in numerous cancer cell studies and animal cancer models. However, there are no published human clinical trials establishing anticancer efficacy. Evidence strength: Entirely preclinical (in vitro and animal models). No human trials exist. Translational challenges — particularly regarding oral bioavailability and the concentrations achievable in human tissues — remain unaddressed.

5.4 Antimicrobial Effects

Preclinical evidence: Mangosteen has strong antibacterial activity against methicillin-resistant and methicillin-sensitive Staphylococcus aureus. Alpha-mangostin from the stem bark of mangosteen was active against vancomycin-resistant Enterococci and methicillin-resistant S. aureus. γ-Mangostin (at 4.68 µg/mL) showed antibacterial activity against Staphylococcus aureus. However, α-Mangostin (at 2.34 µg/mL) displayed more potent activity compared to β-Mangostin and γ-Mangostin against S. aureus.

Xanthones also prevent oxidative damage of LDL, histamine, and serotonin receptor blocker activity, and inhibit HIV. The xanthones and tannins of the mangosteen pericarp protect against insects, fungi, plant viruses, bacteria, and animals while the fruit is still immature.

Mangosteen xanthones have also shown in vitro activity against HIV, hepatitis C, and influenza viruses, but these findings are preliminary. Evidence strength: Predominantly in vitro; no controlled human clinical trials for antimicrobial indications.

5.5 Neuroprotective Effects

Preclinical evidence: Mangosteen pericarp-derived agents have shown multifunctional effects including neuroprotective, antioxidant, and anti-neuroinflammatory actions. In addition, they target specific disease pathologies, such as amyloid beta production and deposition as well as cholinergic dysfunction in Alzheimer's disease; α-synuclein aggregation in Parkinson's disease; and modulation of monoamine disturbance in depression.

Anti-inflammatory effects were evident as mangosteen extract reduced pro-inflammatory cytokines and modulated the NF-κB and COX-2 pathways in neuroinflammation models. Xanthones further suppressed inflammatory mediators and enhanced cellular resilience. In vitro and in vivo results suggested the neuroprotective capabilities of mangosteen extracts and purified bioactives.

A key unanswered question is whether mangosteen xanthones can cross the blood-brain barrier at sufficient concentrations following oral administration. The lipophilic nature of prenylated xanthones theoretically favors CNS penetration, but this has not been confirmed in human pharmacokinetic studies.

Evidence strength: Gaps remain in understanding the potential synergistic effects of these bioactives, their druggability properties, and clinical applicability. Further research, especially clinical trials, will be necessary to further advance mangosteen and its derivatives into therapeutic applications.

5.6 Antidiabetic and Metabolic Effects

Preclinical evidence: α-Mangostin has been studied for effects on adipogenesis, lipid metabolism, and adipocyte function in cell culture models. Reported mechanisms include inhibition of fatty acid synthase activity, modulation of AMPK signaling, and suppression of adipogenic transcription factor expression (PPARγ, C/EBPα). In vivo study revealed that administering γ-Mangostin in dosages of 1, 2, and 4 mg/kg reduces creatinine and plasma BUN and can curate damaged renal proximal tubular cells in STZ-induced diabetes mice. The investigation of α-Mangostin on STZ-induced diabetes mice showed that α-Mangostin at doses of 2, 4, and 8 mg/kg decreased plasma creatinine and BUN and had a curative effect on impaired renal proximal tubular cells.

Human evidence: Type 2 diabetes mellitus is a major global health concern characterized by insulin resistance, hyperglycemia, and chronic inflammation. Interest in natural adjunctive therapies has increased, particularly in mangosteen (Garcinia mangostana), which contains xanthone compounds in the peel with potential antidiabetic properties. A systematic review following PRISMA 2020 guidelines assessed mangosteen peel extract or α-mangostin in diabetic human subjects, but the number of qualifying high-quality randomized controlled trials remains very limited. Evidence strength: Preliminary; human translation from robust animal data has not yet been confirmed in adequately powered clinical trials.

5.7 Immune Modulation

Human evidence: Immune function was reported to improve after administration of a mangosteen product in a randomized, double-blind, placebo-controlled trial where subjects were given a 59 mL dose of either a mangosteen-based formulation or placebo once a day for 30 days. Out of 60 subjects, those who were given mangosteen had significantly increased levels of T-helper and double-positive T-cells, IL-1α, and C3 and C4 complements. Evidence strength: Single small RCT using a multicomponent commercial product, limiting attribution to xanthones alone. Results are considered preliminary.

5.8 Cardiovascular Effects

Xanthones, a particular class of plant phytochemicals from mangosteen, are highly biologically active, possess anti-inflammatory properties such as COX inhibition, and have cardiovascular protective effects. Evidence indicates that alpha-mangostin can reduce blood pressure and improve target organ damage in animal models, and network pharmacology analyses have identified multiple potential antihypertensive molecular targets. Evidence strength: Predominantly preclinical; no adequately powered human RCTs for cardiovascular end points.

6. Bioavailability

To evaluate the bioavailability and metabolism of mangosteen xanthones, a study monitored 10 participants given 60 mL of mangosteen juice and fed relatively average nutrient-filled meals. Over a 24-hour period, α-mangostin was the only xanthone to be detected in serum, where the average AUC was 1870 nmol/L × h for females and 1030 nmol/L × h for males, the average Cmax was 159 nmol/L for females and 66 nmol/L for males, and the average tmax was 3.8 h for females and 3.6 h for males. Multiple xanthones, both conjugated and unconjugated, were present in urine.

Like many polyphenolic compounds, xanthones from mangosteen have limited oral bioavailability due to poor aqueous solubility, extensive first-pass metabolism, and rapid phase II conjugation (glucuronidation and sulfation) in the liver and intestine. Low oral bioavailability and poor water solubility limit their therapeutic usage.

Low oral bioavailability and poor brain penetration may limit the therapeutic applications of xanthone derivatives. These challenges can be overcome in part by administering as a form of mangosteen pericarp extract (MPE) or using specific carrier systems. Optimal bioaccessibility of α- and γ-mangostin xanthones was shown to be dependent on incorporation into bile salt mixed micelles.

7. Body Systems and Health Areas Associated with Xanthones

Previous reports have demonstrated that α-mangostin exerts numerous health-promoting effects including anti-obesity, antidiabetic, antioxidant, anti-inflammatory, antiallergic, anticancer, neuroprotective, hepatoprotective, cardioprotective, antimicrobial, and antifungal properties. Research-supported body system associations — at various levels of evidence from in vitro through limited human trials — include:

• Immune system: Modulation of T-cell subpopulations and complement proteins; antiallergic effects via H₁ and 5-HT2A receptor antagonism.
• Musculoskeletal/inflammatory system: Inhibition of NF-κB, COX-1, COX-2, iNOS, and multiple proinflammatory cytokines.
• Nervous system: Neuroprotective effects in models of Alzheimer's disease, Parkinson's disease, and neuroinflammation; monoamine modulation relevant to mood disorders. Targeting of specific disease pathologies such as amyloid beta production and deposition as well as cholinergic dysfunction in AD; α-synuclein aggregation in PD; and modulation of monoamine disturbance in depression.
• Oncology: Pro-apoptotic and antiproliferative effects across multiple cancer cell lines via caspase activation and mitochondrial pathway perturbation.
• Metabolic system: AMPK activation, PPARγ modulation, inhibition of fatty acid synthase; antidiabetic effects on glucose metabolism in animal models.
• Cardiovascular system: Antihypertensive potential via multiple target pathways; antithrombotic and vasorelaxant properties at the preclinical level.
• Integumentary (skin): Disease-specific activity contributed by xanthones such as antibacterial action against Propionibacterium acnes and Staphylococcus epidermidis for acne treatment, and numerous cytotoxic mechanisms involving pro-apoptotic and anti-metastatic effects for skin cancer treatment have been extensively elucidated. Furthermore, xanthones have been reported to modulate pathways responsible for mediating oxidative stress and inflammation such as PPAR, nuclear factor erythroid 2-related factor, and prostaglandin cascades.
• Gastrointestinal system: Traditional anti-diarrheal and anti-dysenteric uses; antibacterial effects against enteric pathogens.

8. Dosage Forms and Dosages Reported in Studies

Mangosteen has most often been used by adults in doses of up to 560 mg by mouth daily, for up to 12 weeks.

The following dosages are taken directly from sources describing specific studies:

• One human bioavailability study investigated the absorption and antioxidant effects of a xanthone-rich mangosteen liquid after acute consumption of 59 mL of the supplement.
• A pharmacokinetic study in 10 participants used 60 mL of mangosteen juice as the single oral dose.
• In a randomized, double-blind, placebo-controlled study, 60 healthy males and females (30 and 30) were given 245 mL doses of either placebo or a mangosteen-containing energy drink for 30 days.
• Subjects in a separate immune function trial were given a 59 mL dose of a mangosteen-based formulation or placebo once a day for 30 days.
• In a murine model of collagen-induced arthritis, arthritic mice were orally administered two doses of α-mangostin (10 and 40 mg/kg) daily, for 33 days.
• In animal models of STZ-induced diabetes, γ-mangostin was administered at dosages of 1, 2, and 4 mg/kg; α-mangostin was studied at doses of 2, 4, and 8 mg/kg.
• Xanthones from mangosteen pericarp have been demonstrated to be nontoxic to mice when administered orally at a dose of 100 mg/kg of body weight per day for 7 days.

There is no established Recommended Dietary Allowance (RDA), Adequate Intake (AI), or clinically validated therapeutic dose for mangosteen or its xanthone components.

9. Safety Considerations and Interactions

General Safety Profile

Mangosteen pericarp extract and α-mangostin are generally safe and well-tolerated in animals. Furthermore, mangosteen-based products are safe for humans at studied doses, based on the available evidence. While α-mangostin demonstrates a favorable safety profile with no apparent hepatotoxic effects at common dosages, interactions with certain medications may pose risks. Thus, individuals on specific drug therapies should approach its use with caution.

Lactic Acidosis (Case Report)

A significant safety signal has been documented in the peer-reviewed literature. A case report published in the American Journal of Kidney Diseases (Wong LP, Klemmer PJ, 2008) described severe lactic acidosis associated with long-term ingestion of highly concentrated mangosteen juice. Excessive, long-term consumption of highly concentrated mangosteen products has been linked to severe complications like lactic acidosis. This represents a rare but serious adverse event associated specifically with concentrated supplemental preparations rather than moderate consumption of the fresh fruit.

Anticoagulant and Antiplatelet Interactions

Theoretically, concomitant use of mangosteen with anticoagulant or antiplatelet drugs may increase the risk of bleeding. In vitro and animal research shows that gamma-mangostin, a constituent of mangosteen, is a potent and competitive antagonist of the serotonin 2A (5-HT2A) receptor. Theoretically, concomitant use of mangosteen with anticoagulant or antiplatelet drugs may increase the risk of bleeding. Antagonism of the 5-HT2A receptor is believed to reduce platelet aggregation. This interaction has been documented primarily in laboratory and animal research; human clinical data are limited to case reports and conflicting studies.

Drug Interactions

α-Mangostin demonstrates a favorable safety profile with no apparent hepatotoxic effects at common dosages; however, interactions with certain medications may pose risks. Given xanthones' potential modulation of cytochrome P450 enzyme pathways (a pharmacological property shared with many prenylated polyphenols), drug interaction risk for medications with narrow therapeutic windows — including anticoagulants, immunosuppressants, and certain chemotherapy agents — is a theoretical concern not yet fully characterized in human studies.

Evidence Strength: Overall Summary

Despite consistently impressive preclinical findings across anticancer, neuroprotective, antidiabetic, and anti-inflammatory research, almost no well-designed clinical trials have confirmed therapeutic benefits for any condition in humans. The overarching theme across all health claims for mangosteen is a substantial gap between impressive laboratory findings and the near-total absence of confirmatory human clinical trials. The body of evidence for xanthones thus remains predominantly at the preclinical stage, and claims of therapeutic benefit in humans require further validation through adequately powered, rigorously designed clinical trials.

References

• Oriola AO, Kar P. Naturally Occurring Xanthones and Their Biological Implications. Molecules. 2024;29(17):4241. PMC11396865.
• Xanthone Dimers in Angiosperms, Fungi, Lichens: Comprehensive Review. PMC11858044.
• Medicinal properties of mangosteen (Garcinia mangostana L.): A comprehensive update. Food and Chemical Toxicology. 2017. ScienceDirect.
• Characterisation and quantification of xanthones from mangosteens by HPLC–DAD–MSn. Food Chemistry. 2012. ScienceDirect.
• Gutierrez-Orozco F, Failla ML. Biological Activities and Bioavailability of Mangosteen Xanthones: A Critical Review. Nutrients. 2013;5(8):3163–3183. PMC3775248.
• Chen LG et al. Anti-inflammatory activity of mangostins from Garcinia mangostana. Food and Chemical Toxicology. 2008. PubMed 18029076.
• The metabolic and molecular mechanisms of α-mangostin in cardiometabolic disorders. PMC9354700.
• Gutierrez-Orozco F et al. α-Mangostin: anti-inflammatory activity and metabolism by human cells. J Agric Food Chem. 2013. PubMed 23578285.
• Alpha-mangostin: Anti-inflammatory and antioxidant effects on established collagen-induced arthritis. Food Chem Toxicol. 2019. PubMed 30557668.
• Effects of alpha-mangostin on the expression of anti-inflammatory genes in U937 cells. PMC3476971.
• A Systematic Review of Neuroprotective Effects of Mangosteen and its Xanthones Against Oxidative Stress and Inflammation. PubMed 40845897.
• The purple mangosteen (Garcinia mangostana): Defining the anticancer potential of selected xanthones. PMC9597473.
• Alterations in Cell Cycle and Induction of Apoptotic Cell Death in Breast Cancer Cells Treated with α-Mangostin. PMC3332218.
• Gamma-Mangostin, a Micronutrient of Mangosteen Fruit, Induces Apoptosis in Human Colon Cancer Cells. PMC6268430.
• α-Mangostin: A Xanthone Derivative in Mangosteen with Potent Anti-Cancer Properties. PMC11591772.
• Xanthones from Mangosteen Extracts as Natural Chemopreventive Agents: Potential Anticancer Drugs. PMC3237908.
• The effect of gartanin, a naturally occurring xanthone in mangosteen juice, on the mTOR pathway, autophagy, apoptosis and the growth of human urinary bladder cancer cell lines. PMC3671488.
• Mangosteen Pericarp and Its Bioactive Xanthones: Potential Therapeutic Value in Alzheimer's Disease, Parkinson's Disease, and Depression. PMC7504283.
• A Mechanistic Review on Protective Effects of Mangosteen and its Xanthones Against Hazardous Materials and Toxins. PMC11333789.
• α-Mangostin Is a Xanthone Derivative from Mangosteen with Potent Immunomodulatory and Anti-Inflammatory Properties. PMC12108668.
• Bioavailability and Antioxidant Effects of a Xanthone-Rich Mangosteen Product in Humans. J Agric Food Chem. 2009. ACS Publications.
• The Comparative Toxicity of Xanthones and Tannins in Mangosteen Pericarp Extract against BHK-21 Fibroblast Cell Culture. PMC7145252.
• Chairungsrilerd N et al. Histaminergic and serotonergic receptor blocking substances from the medicinal plant Garcinia mangostana. Planta Med. 1996;62:471–2. PubMed 8923814.
• Mangosteen Uses, Benefits & Dosage. Drugs.com Natural Products Database.
• Effects of Garcinia mangostana Peel Extract on Glycemic Control in Type 2 Diabetes Mellitus: A Systematic Review. Acta Medica Indonesiana.
• An anti-inflammatory molecular mechanism of action of α-mangostin from the pericarp of Garcinia mangostana. PubMed 29953154.
• Decoding the anti-hypertensive mechanism of α-mangostin based on network pharmacology and molecular docking. PMC11600633.
• Antitumor and apoptosis-inducing effects of α-mangostin in YD-15 tongue mucoepidermoid carcinoma cells. PMC4790674.
• Mangostanin, a Xanthone Derived from Garcinia mangostana, Exerts Protective and Reparative Effects on Oxidative Damage in Human Keratinocytes. PMC8780152.
• Stanfield B. Mangosteen: Benefits, Forms, Dosing, and Side Effects. drstanfield.com.
• Prenylated xanthones from mangosteen (Garcinia mangostana) target oxidative mitochondrial respiration in cancer cells. Biomedicine & Pharmacotherapy. 2024. ScienceDirect.