Mandarin

Mandarin (Citrus reticulata Blanco): A Comprehensive Reference

1. Identity and Botanical Classification

1.1 Botanical Name and Taxonomy

The mandarin orange, known as Citrus reticulata Blanco, belongs to the Rutaceae botanical family. The Latin species epithet reticulata means "netted," a reference to the net-like fibrous structure of the fruit. Within Rutaceae, the genus Citrus is among the most economically significant, encompassing several hundred cultivated varieties worldwide.

According to genetic studies, the wild mandarin was one of the original citrus species; through breeding or natural hybridization, it is the ancestor of many hybrid citrus cultivars. It has been used to create many well-known varieties, such as clementines and tangerines. As a member of the Rutaceae family, citrus is regarded as one of the largest plant species, with a wide distribution across tropical, subtropical, and temperate regions globally due to natural or artificial hybridization, resulting in numerous different varieties and hybrids.

1.2 Common Names and Vernacular Designations

The name "mandarin orange" is a calque of the Swedish mandarin apelsin (from the German Apfelsine, meaning "Chinese apple"), first attested in the 18th century. In traditional Chinese medicine (TCM), the dried peel is designated Chen Pi (陈皮) or Ju Pi. The seeds are known as Ju He (橘核) and the leaves as Ju Ye. In Ayurvedic tradition, the fruit is called Naranga or Nagaranga, and in Tamil it is known as Kamala Pazham.

1.3 Botanical Description

The plant is a moderate-sized tree reaching approximately 7.6 meters (25 feet) in height, with thorns on the trunk and major branches, and shiny, relatively small, green leaves. The mandarin is small and oblate, unlike the roughly spherical sweet orange (which is a mandarin-pomelo hybrid). A ripe mandarin orange is firm to slightly soft and heavy for its size, with a thin, loose peel containing little white mesocarp, making it usually easier to peel and split into segments.

1.4 Geographic Origin and Distribution

Possibly native to south-east China and/or south Japan, it is a fruit tree that grows at low elevations in hillside forests. Originating from South-East China, it was imported into Africa and Europe between the 15th and 19th centuries. Today, C. reticulata crops are widespread throughout the world, but are mainly cultivated in China, Brazil, Spain, Turkey, Morocco, Egypt, and Italy.

1.5 Common Forms and Preparations

• Fresh fruit: The fruit is eaten fresh, used in salads and desserts, or juiced.
• Dried peel (Chen Pi / Citri Reticulatae Pericarpium, CRP): Citri Reticulatae Pericarpium (CRP), commonly known as dried tangerine peel in English, is a widely used traditional Chinese medicine (TCM) derived from the mature peels of citrus plants belonging to the Rutaceae family, particularly various cultivated varieties of Citrus reticulata. In TCM, the peel is often aged; Chen Pi is the aged tangerine peel; it has a more delicate flavor and is less pungent and drying than the freshly dried peel.
• Essential oil: Essential oil from C. reticulata (CBEO) is abundant in bioactive compounds such as flavonoids, terpenes, and coumarins.
• Extracts and nutraceuticals: Standardized extracts, often concentrated for specific flavonoids (hesperidin, nobiletin, tangeretin), are available as dietary supplement capsules and tablets.
• Seeds (Ju He) and leaves (Ju Ye): The seeds of Citrus reticulata Blanco (Juhe) are a valued traditional Chinese medicine with a documented history of use spanning millennia. Traditionally, they have been used to treat hernia pain, orchalgia, and various breast disorders.

2. Traditional and Historical Use

2.1 Traditional Chinese Medicine (TCM)

The dried pericarp of Citrus reticulata Blanco has thousands of years of medicinal history in China, and is classified as a "top grade" medicine in the Variorum of Shennong's Classic of Materia Medica (Shennong Ben Cao Jing). Chen Pi (Citrus reticulata/mandarin orange peel) has been used in China since the second century B.C.

Citri Reticulatae Pericarpium (CRP), most frequently used as a qi-regulating drug in thousands of Chinese medicine prescriptions, is found mainly in major citrus-producing areas such as the Guangdong, Guangxi, Sichuan, Fujian, and Zhejiang Provinces of China. Since thousands of years in China, CRP has been used widely in clinical practice to treat nausea, vomiting, indigestion, loss of appetite, diarrhea, cough, expectoration, and so on. Currently, CRP is listed in the Pharmacopoeia of the People's Republic of China.

The dried pericarp occupies an important position in the history of clinical applications of traditional Chinese medicine. In traditional use, it is used to treat diseases related to the digestive, respiratory, and cardiovascular systems, as well as to regulate Qi and promote blood circulation throughout the body. For hundreds of years, herbalists trained in TCM have used mature mandarin orange peel (chen pi or ju pi) to improve digestion, relieve intestinal gas and bloating, and resolve phlegm. This peel acts primarily on the digestive and respiratory systems, applied in conditions involving a sense of distension and fullness in the chest and upper middle abdomen combined with loss of appetite, vomiting or diarrhea, or coughs with copious phlegm.

Different parts of C. reticulata were designated as distinct TCM medicines with specific indications:

• Chen Pi is the aged tangerine peel, with a more delicate flavor and less pungent and drying character than freshly dried peel.
• Ju Hong is the red tangerine peel — more drying and stronger to move Qi, but not as effective at regulating the stomach.
• Tangerine seeds (Ju He) are described as neutral and bitter, used to move Qi, open obstruction, and ease pain — mainly used for hernia and breast lumps.
• Tangerine leaf is neutral and bitter, moves the Qi of the liver, and is used for hypochondriac pain, breast abscesses, lumps, and abdominal masses.

In TCM, Chen Pi is often combined with other herbs to enhance its therapeutic effects and to create balanced formulas. It is a key component in the classic formula "Er Chen Tang," used to treat damp-phlegm conditions in the respiratory and digestive systems.

2.2 Ayurvedic and South Asian Traditions

In Ayurvedic medicine, Citrus reticulata is called Naranga or Nagaranga. It is considered valuable in medicinal preparations (Yogaranga), used in formulations. In Ayurveda, mandarins are said to balance vata.

2.3 Cultural and Symbolic Uses

For Chinese people, mandarins, along with tangerines, symbolize abundance and good fortune. It is a part of Chinese tradition that during Chinese New Year, mandarins and tangerines are used as decoration and given as gifts. In other countries such as Japan, Canada, the United States, and Russia, it is a Christmas tradition to give mandarins as gifts.

3. Key Constituents and Active Compounds

3.1 Overview of Phytochemistry

Mandarin orange (Citrus reticulata Blanco) is often known as an excellent source of vitamin C and is well utilized in culinary and nutraceutical contexts. Almost every component of the plant — peels, pulps, leaves, barks, and roots — has been reported to contain a diverse array of phytochemicals. The relative composition of chemical constituents depends on the geographical location and variety.

3.2 Flavonoids

The major components of CRP are dietary flavonoids, which are generally categorized into two groups: flavanone glycosides (primarily hesperidin) and polymethoxylated flavones (PMFs, primarily nobiletin and tangeretin). Currently, hesperidin is used as a chemical reference for quality control of CRP in the Chinese pharmacopeia because of its extremely high concentration (over 3%).

Polymethoxylated flavones (PMFs) are among the most pharmacologically distinctive constituents of mandarin peel:

• Nobiletin: Nobiletin, a dietary citrus flavonoid, exerts biological activities against hyperlipidemia, obesity, and atherosclerotic cardiovascular diseases.
• Tangeretin: Tangeretin, also known as 4,5,6,7,8-pentamethoxyflavone, is a major compound in citrus peels. It has been shown to possess a variety of pharmacological activities, including anti-oxidative, anti-inflammatory, and anticancer properties.
• Other PMFs: GC-MS/MS analysis of mandarin peel detected over 90 compounds with notable polymethoxyflavones including nobiletin (29.04%), tangeretin (15.55%), artemetin (8.1%), 6-demethoxytangeretin (1.28%), sinensetin (0.95%), demethylnobiletin (0.14%), pebrellin (0.10%), and salvigenin (0.04%).
• Hesperidin and flavanone glycosides: The flavonoid composition in the flavedos differs between mandarin varieties. Satsuma mandarin accumulates high levels of flavanones, which account for more than 85% of total flavonoids.

PMFs are a unique group of methylated flavonoids existing exclusively in citrus fruits, particularly the peel of sweet oranges (Citrus sinensis) and mandarins (Citrus reticulata). Numerous in vitro and in vivo studies have indicated that PMFs are the major bioactive flavonoids in citrus peel. PMFs have attracted attention due to their high oral bioavailabilities compared to hydroxyflavones; the high oral bioavailability of PMFs is due to the lipophilic nature of the structure's multiple methoxy groups.

3.3 Essential Oils

Essential oils derived from peels, fruits, and leaves contain 85–99% of terpenes and non-terpene hydrocarbons. The main components of CRP volatile oils include d-limonene, along with flavonoid components such as hesperidin, naringenin, nobiletin, and tangeretin. The major essential oil constituent, d-limonene, is a monocyclic monoterpene that is primarily responsible for the characteristic citrus aroma.

3.4 Additional Phytochemicals

• Some C. reticulata populations have been shown to contain coumarins and furanocoumarins. Other minor chemicals consist of benzoic acid derivatives and steroidal glycosides.
• From the mandarin peel, the limonoid limonin (C) and the phytosterol β-sitosterol (D) have also been isolated and characterized.
• The rind's main constituents include fat, protein, ash, magnesium, carotenoids, dietary fiber, and polyphenols.

3.5 Bioavailability and Pharmacokinetics

The absolute bioavailability of tangeretin is 27.11%, due to its extensive biotransformation via CYP1A2 in the liver. Unlike other flavonoids with low bioavailability in the human body, PMFs with their hydroxyl groups covered by methylation have a great advantage in terms of oral bioavailability. PMFs are a subgroup of plant flavonoids that have attracted increasing attention on account of their broad-spectrum biological activities, including anti-cancer, anti-inflammatory, neuroprotective, antimicrobial, and antioxidative properties.

4. Mechanisms of Action

4.1 Anti-inflammatory Mechanisms

Three polymethoxyflavones — nobiletin, tangeretin, and 5-demethylnobiletin — isolated from C. reticulata have been found to inhibit nitric oxide (NO) production and the expressions of IL-1β, IL-6, and TNF-α in cell models. PMFs effectively suppressed mRNA biomarkers of acute inflammation (Cox-2 and iNOS), and to varying degrees promoted the activation of anti-inflammatory cytokines (IL-4, IL-13, TNF-β, and IL-10). Nobiletin, a polymethoxylated flavone in Chenpi, inhibited NLR family pyrin domain containing 3 (Nlrp3), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α) gene expression in a mouse model of cystitis.

4.2 Antioxidant Mechanisms

Citrus peel dietary fiber has been shown to enhance serum and liver antioxidant enzyme activities and reduce malondialdehyde (MDA) levels in oxidative stress model mice. Citrus peel extract similarly enhanced the activity of serum antioxidant enzymes including superoxide dismutase (SOD) and catalase (CAT), while decreasing MDA levels in animal models.

4.3 Lipid-Modulating Mechanisms

Transcriptome analysis showed that nobiletin significantly downregulates a set of genes associated with the "regulation of lipid metabolic process," with angiopoietin-like 3 (ANGPTL3) — an inhibitor of lipoprotein lipase (LPL) activity that regulates triglyceride-rich lipoprotein metabolism in circulation — being the protein most markedly downregulated.

4.4 Antiproliferative and Cancer-Related Mechanisms

Tangeretin and nobiletin are citrus flavonoids that are among the most effective at inhibiting cancer cell growth in vitro and in vivo. Both flavonoids inhibited proliferation in a dose- and time-dependent manner and blocked cell cycle progression at G1 in cancer cell lines. At concentrations that resulted in significant inhibition of proliferation and cell cycle arrest, neither flavonoid induced apoptosis or cell death in tumor cell lines. In breast cancer stem cells, tangeretin reduced the total level and phosphorylated nuclear level of signal transducer and activator of transcription 3 (Stat3), indicating that tangeretin inhibits the Stat3 signaling pathway and induces cancer stem cell death.

4.5 Neuroprotective Mechanisms

Network pharmacological analysis has revealed that key active components of chenpi (nobiletin, naringenin, hesperetin) regulate five core targets (AKT1, TP53, IL6, VEGFA, MMP9), with 103 potential pathways identified. Chenpi can exert protective effects via the PI3K-Akt signaling pathway and the MAPK signaling pathway.

5. Scientific Evidence by Area of Use

5.1 Digestive Health

Traditional basis: Since thousands of years in China, CRP has been used widely in clinical practice to treat nausea, vomiting, indigestion, loss of appetite, and diarrhea.

Preclinical evidence: Chenpi extract and hesperidin significantly inhibited aspirin-induced oxidative DNA damage. The bleeding score of aspirin-induced gastric mucosa was significantly reduced by treatment with Chenpi extract and hesperidin in a rat model. When the effects of Chenpi extract and hesperidin on the analgesic effect of aspirin were tested, they did not significantly affect the analgesic effect of aspirin.

Human clinical evidence: Tangerine Peel Enzyme Drink (CPJS), a fermented health product derived from tangerine peel, has demonstrated lipid-modulating properties; a pilot randomized controlled trial aimed to evaluate the efficacy and safety of CPJS in improving dyslipidemia and explore its underlying metabolic and microbiological mechanisms. The body of direct clinical evidence for digestive endpoints remains limited. Most evidence supporting the digestive use of mandarin preparations is from traditional use records, preclinical animal experiments, and mechanistic studies; controlled human trials remain sparse.

5.2 Cardiovascular and Lipid Metabolism

Preclinical evidence: The peel of Citrus reticulata and its components are rich in bioactivity and medicinal value. In vitro and in vivo experiments have shown that CP has protective effects against cardiovascular system diseases and disorders of glucose-lipid metabolism. Fresh citrus peel has been shown to protect against atherosclerosis in animal models, reducing fatty plaques in coronary arteries and aortas and enhancing antioxidant capacity in rabbit plasma. The polymethoxyflavonoid nobiletin present in citrus peel significantly improved hemodynamic parameters, oxidative stress, collagen levels, vascular reactivity, cardiac hypertrophy index, and myocardial fibrosis in STZ-induced diabetic rats.

Human clinical evidence: One human clinical trial, the NIRVANA study, evaluated the effect of a nutraceutical preparation on lipid profile, endothelial function, and oxidative stress. Each capsule consisted of red yeast rice (containing monacolin K), PMFs from a tangerine extract (mainly nobiletin and tangeretin), hydroxytyrosol from olive fruit extract, and other nutrients. However, this study cannot be considered as providing evidence of an effect of PMFs alone on human health, as they are constituents of a multi-component mixture in which they are present at low concentration and the beneficial effect might be due to other bioactives or synergy among components.

A dose-response meta-analysis of randomized controlled trials found that hesperidin supplementation significantly reduced triglycerides, total cholesterol, LDL, TNF-alpha, and systolic blood pressure. The effective dosage was approximately 1,000 mg/day, with interventions longer than 6–8 weeks showing stronger effects on fasting blood glucose and insulin levels. It should be noted that hesperidin is found in many citrus species and this evidence is not specific to mandarin alone.

Evidence strength: Many in vitro and some in vivo studies have shown potentially relevant biological effects of PMFs, including anticancer, anti-inflammatory, anti-atherosclerosis, and neuroprotective activities. These promising biological effects still require further research to establish their impact on human health. The cardiovascular evidence as it applies specifically to Citrus reticulata preparations in humans is therefore preliminary.

5.3 Antioxidant and Anti-inflammatory Effects

Preclinical evidence: Modern pharmacological studies have demonstrated that tangerine peel has various beneficial effects including hepatoprotective, anti-asthma, antioxidant, anti-inflammatory, and hypolipidemic activities. Pharmaceutical studies have shown that the mandarin essential oil and its components have antioxidant, anti-inflammatory, anticancer, antibacterial, and antifungal properties.

Evidence strength: Anti-inflammatory and antioxidant evidence is derived predominantly from cell-culture and animal studies. These promising biological effects still require further research to establish their impact on human health.

5.4 Anticancer Properties

Preclinical evidence: Citrus flavonoids — including tangeretin, nobiletin, hesperetin, hesperidin, naringenin, and naringin — have been shown to possess inhibitory activity on certain cancer cells through various mechanisms, including cell cycle modulation, antiangiogenic effects, and apoptosis induction. Citrus flavonoids also show promising effects in combination with several chemotherapeutic agents against the growth of cancer cells.

In an in vitro study from 2026, nobiletin, scoparone, and tangeretin isolated from Citrus reticulata peel extract were investigated in acute myeloid leukemia cells. Cell treatments attenuated the invasiveness of AML cells through upregulation of TIMP-2 at the transcriptional level. The authors concluded that this study supports pharmaceutical interest in citrus waste for cancer management, providing evidence of antileukemic potential in vitro.

Evidence strength: All anticancer evidence for mandarin constituents is currently confined to in vitro cell culture studies and animal models. There are no published human clinical trials demonstrating cancer prevention or treatment benefit from mandarin or its isolated compounds. Evidence is preliminary and mechanistic only.

5.5 Neuroprotective and Neurological Effects

Preclinical evidence: An observational human study was performed to evaluate the effectiveness of "Yokukansankachimpihange," a formulation combined with nobiletin-rich Citrus reticulata and donepezil on improving the behavioral and psychological symptoms of dementia, though results of this observational study do not establish causation. Molecular docking indicated that hesperetin had better binding activity for core neurological and cancer-related targets. In a mouse model of lung cancer with COPD, treatment with hesperetin dose-dependently improved both lung tissue injury in COPD and carcinoma lesions.

Evidence strength: Neuroprotective evidence consists of in vitro mechanistic studies, animal models, and one observational human study in a compound formula. Direct, controlled human evidence for neurological benefits of mandarin preparations is absent.

5.6 Respiratory Health

In traditional Chinese medicine, the plant is used for the treatment of dyspepsia, gastro-intestinal distension, cough, hiccup, and vomiting. Network pharmacology analyses have predicted that Chenpi can prevent COPD and its progression to lung cancer by involvement in the PI3K-Akt signaling pathway and MAPK signaling pathway. This remains a preclinical and computational finding.

5.7 Mood, Anxiety, and Aromatherapy

The essential oil of mandarin has been investigated in the context of aromatherapy. Essential oil extracts from citrus plants (generally rich in terpenes such as (+)-limonene, α-pinene, and camphene), including Citrus aurantium L. and Citrus bergamia Risso, were found to relieve anxiety after oral or inhalation administration by regulating vital parameters such as blood pressure, heart rate, and heart rate variability in two separate clinical trials. However, these trials used different citrus species, not mandarin specifically.

Animal model research has indicated antidepressant and anxiolytic properties of the mandarin peel essential oil. Studies have found that mandarin essential oil benefits emotional wellbeing by helping to alleviate anxiety, and research suggests it could have antidepressant effects. However, these findings are from animal studies, so further investigation is necessary to clarify the oil's influence on human patients.

Evidence strength: Clinical aromatherapy evidence for anxiety reduction is available for closely related citrus oils (bitter orange, bergamot, lemon) but not mandarin specifically in controlled human trials. The animal findings for mandarin essential oil are preliminary.

6. Body Systems and Health Areas of Association

• Digestive system: CRP, aged for over three years, has attracted increasing attention for its diverse health-promoting effects, including gastrointestinal-modulating properties.
• Respiratory system: In traditional use, the dried pericarp is used to treat diseases related to the digestive, respiratory, and cardiovascular systems, and to regulate Qi and promote blood circulation throughout the body.
• Cardiovascular system: Modern pharmacology shows that the dried pericarp has high effect on regulating metabolic disorders and cardiovascular system diseases.
• Nervous system: In a clinical study involving patients diagnosed with stress- and depression-related symptoms, four weeks of essential oil-based aromatherapy resulted in a decrease in the level of anxiety and depression and a simultaneous increase in blood plasma BDNF levels in brain hippocampal tissues — though this study used mixed essential oils, not mandarin specifically.
• Hepatic system: Modern pharmacological studies have demonstrated hepatoprotective activity for tangerine peel.
• Immune/Inflammatory system: Evidence from a number of studies shows that the flavonoid constituents of CRP have potent suppressive effects on pro-inflammatory mediators, hence their role in inflammatory regulation and cancer prevention is well supported experimentally.
• Skeletal system: CRP has attracted increasing attention for diverse health-promoting effects, and moreover positively impacts skeletal health and various physiological functions.

7. Dosage Forms and Reported Dosages

Dosages reported in studies and traditional medicine sources vary considerably by preparation type and indication:

• Tangerine seed (Ju He) — Traditional TCM dose: Tangerine seeds are neutral and bitter, move Qi, open obstruction, and ease pain. Mainly used for hernia and breast lumps. Dose: 3–9 grams.
• Tangerine leaf (Ju Ye) — Traditional TCM dose: Tangerine leaf is neutral and bitter, moves the Qi of the liver, and is used for hypochondriac pain, breast abscesses and lumps, and abdominal masses. Dose: 6–9 grams.
• Hesperidin supplementation (meta-analysis of RCTs): A dose-response meta-analysis of RCTs found that hesperidin supplementation significantly reduced triglycerides, total cholesterol, LDL, TNF-alpha, and systolic blood pressure. The effective dosage was approximately 1,000 mg/day, with interventions longer than 6–8 weeks showing stronger effects on fasting blood glucose and insulin levels.
• Citrus reticulata peel extract — Animal study dose: In one rodent study, CPE was administered at 400 mg/kg body weight orally for 14 days.
• Chenpi extract with hesperidin — Animal study dose: Chenpi extract or hesperidin was administered at 20 mg/kg body weight by oral administration in rat studies.
• Quality control standard: Hesperidin is used as a chemical reference for quality control of CRP in the Chinese pharmacopeia because of its extremely high concentration (over 3%).

No standardized dosage for mandarin peel preparations has been established by a major Western regulatory body such as the EMA, EFSA, or NIH ODS as of the time of this writing. Dosage information from human clinical trials specifically for whole mandarin peel preparations remains limited.

8. Safety Considerations and Known Interactions

8.1 General Safety Profile

The dermal LD50 of mandarin peel oil (Citrus reticulata) was greater than 5 g/kg in rabbits in animal toxicology testing. No relevant published repeated-dose toxicity studies on citrus peel-derived ingredients were identified in a literature search, and no relevant published reproductive and developmental studies were identified.

A formulation containing 3% Citrus Reticulata (Tangerine) Peel Extract was not genotoxic in a reverse mutation assay. No photo-irritation was observed in an in vitro study of Citrus Reticulata (Tangerine) Peel Extract at 3.0% in formulation.

8.2 CYP450 Enzyme Interactions

Mandarin peel constituents have demonstrated significant interactions with cytochrome P450 drug-metabolizing enzymes, which is relevant to pharmaceutical co-administration:

• Hesperidin and its metabolite hesperetin showed an inhibitory effect on the activities of CYP1A, CYP1B1, CYP3A4, and P-glycoprotein (P-gp).
• Tangeretin exerts an inhibitory effect on OATP2B1 but can significantly increase the mRNA expression of CYP3A4 by regulating PXR. Nobiletin is both a CYP1A2 inhibitor and inducer, while tangeretin is an inducer of CYP3A4.
• Flavonoid and furanocoumarin compounds in Chen Pi have been shown to inhibit CYP450 enzyme activity. This may slow the metabolism of drugs processed through these pathways, including omeprazole and other proton pump inhibitors. Long-term concurrent use requires monitoring of blood drug levels.

8.3 Specific Drug Interactions

• Cardiac glycosides (digoxin): Chen Pi should not be combined with digitalis-type cardiac glycosides, as it may enhance their effects and increase toxicity risk.
• Monoamine oxidase inhibitors (MAOIs): Chen Pi contains synephrine, a sympathomimetic amine. Concurrent use with monoamine oxidase inhibitors may trigger a hypertensive crisis ("tyramine-like reaction").
• Alpha-adrenergic blockers: Alpha-adrenergic blockers (phentolamine, phenoxybenzamine) may counteract the mild pressor effects of Chen Pi's synephrine content, reducing therapeutic efficacy.
• Statins and other CYP3A4 substrates: Isolated, high-dose supplements may interact with drug-metabolizing enzymes (CYP450 pathways), similar to grapefruit compounds. Those on statins or certain antihistamines should be cautious.

8.4 Skin and Contact Sensitization

In a retrospective study of professional food handlers in Denmark, 8.5% (16/188) of patients had positive skin prick test reactions to orange peel, and 7.9% (15/191) had positive skin prick test reactions to citrus materials. Contact sensitization to citrus peels is documented in occupationally exposed individuals.

8.5 Gastrointestinal Tolerance

The mandarin peel extract has not been subjected to acute, subacute, or chronic toxicity evaluations in at least some published reports, which should be addressed in future studies. Available data indicate general tolerability at food-equivalent amounts, but formal human safety data for high-dose supplemental preparations are limited.

References

• Recent Advances in the Health Benefits and Application of Tangerine Peel (Citri Reticulatae Pericarpium): A Review — PMC
• Citri Reticulatae Pericarpium (Chenpi): Botany, ethnopharmacology, phytochemistry, and pharmacology — ScienceDirect
• The Chemistry and Pharmacology of Mandarin Orange (Citrus reticulata) — Springer
• Mandarin orange — Wikipedia
• The Seeds of Citrus reticulata Blanco (Juhe): A Comprehensive Review — ScienceDirect
• Inhibitory Effects of Tangeretin on Breast Cancer Stem Cell Formation — PMC
• Tangeretin and Nobiletin Induce G1 Cell Cycle Arrest in Human Cancer Cells — PubMed
• Comparative Effects of Five Polymethoxyflavones from Citrus tangerina on Inflammation and Cancer — PMC
• Pharmacokinetics, Bioavailability, Tissue Distribution and Excretion of Tangeretin in Rat — PMC
• Expression and Functional Analysis of the Nobiletin Biosynthesis-Related Gene CitOMT in Citrus Fruit — PMC
• Three Polymethoxyflavones from the Peel of Citrus reticulata "Chachi" Inhibit Foam Cell Formation — PMC
• Citri Reticulatae Pericarpium (Chenpi) Protects against Endothelial Dysfunction in Diabetic Rats — MDPI Nutrients
• The Citrus Flavonoid Nobiletin Downregulates ANGPTL3 and Exhibits Lipid-Modulating Effects — PMC
• Protective Effects of Dried Mature Citrus unshiu Peel (Chenpi) and Hesperidin on Aspirin-Induced Oxidative Damage — PMC
• Potential Herb-Drug Interactions between Anti-COVID-19 Drugs and Traditional Chinese Medicine — PMC
• Citrus Essential Oils in Aromatherapy: Therapeutic Effects and Mechanisms — PMC
• Essential Oils for Clinical Aromatherapy: A Comprehensive Review — ScienceDirect
• The Mechanism and Candidate Compounds of Aged Citrus Peel (Chenpi) Preventing COPD and Progression to Lung Cancer — PMC
• Antidepressant and Anxiolytic Potential of Citrus reticulata Essential Oil: A Network Pharmacology and Animal Model Study — Frontiers in Pharmacology
• In Vivo and In Vitro Safety Evaluation of Fermented Citrus sunki Peel Extract — PMC
• Safety Assessment of Citrus-Derived Peel Oils as Used in Cosmetics — CIR (Cosmetic Ingredient Review)
• Safety Assessment of Citrus Peel-Derived Ingredients as Used in Cosmetics — CIR
• An Update on Citrus Polymethoxyflavones: Chemistry, Metabolic Fate, and Relevant Bioactivities — European Food Research and Technology, Springer
• Phytochemical Isolation and Bioactivities of Polymethoxyflavones from Citrus reticulata Blanco Shell — PMC
• Effects of Chenpi Jiaosu on Serum Metabolites and Intestinal Microflora in Dyslipidemia: A Randomized Controlled Pilot Trial — PMC
• Orchestration of the Tumor Microenvironment by Citrus Flavonoids — Frontiers in Immunology
• Mechanisms of Antiproliferative Effects of Nobiletin, Scoparone, and Tangeretin from Citrus reticulata in Acute Myeloid Leukemia Cells — PMC
• Evaluation of Chemical Components in Citri Reticulatae Pericarpium by GC-MS and HPLC — PMC