Capsanthin

Capsanthin

1. Identity, Chemistry, and Natural Sources

Chemical Identity

Capsanthin is a natural red dye of the xanthophyll class of carotenoids. It is a brightly orange-red–coloured pigment responsible for the peculiar red colour of paprika fruits (Capsicum annuum), belonging to xanthophylls, a class of oxygen-containing carotenoids. Its CAS registry number is 465-42-9, and its molecular formula is C₄₀H₅₈O₃, characterized by an intense red color. The full IUPAC name, as recorded by chemical databases, describes a nonadeca-nonaen-one backbone bearing a hydroxyl-trimethylcyclohexenyl group at one terminus and a hydroxyl-trimethylcyclopentyl group at the other — capsanthin is a xanthophyll containing a 6-oxo-κ end-group (keto-carotenoid) in its molecule.

Capsanthin has antioxidant capacity in vitro due to the presence of eleven conjugated double bonds, a conjugated keto group, and a cyclopentane ring. This characteristic chemical structure — a keto group in conjunction with a long chain of 11 conjugated dienes — is responsible for its strong radical scavenging and singlet oxygen quenching ability. As a lipophilic molecule, capsanthin is soluble in organic solvents such as oil and ethanol, and insoluble in water.

As a food coloring, it has the E number E160c(i). This colorant is available in two forms — fat-soluble and water-dispersible. E160c(i) (paprika oleoresin) is a fat-soluble form obtained by extracting carotenoids from paprika using organic solvents, used in fat-based foods such as oils, margarines, and meat products. E160c(ii) is a more versatile form that may be either fat-soluble or water-dispersible.

Botanical Source

Capsanthin is the main carotenoid in the Capsicum annuum species of plants including red bell pepper, New Mexico chile, and cayenne peppers, and a component of paprika oleoresin. Capsanthin is also found in some species of lily. These keto-carotenoid constituents were mainly found among Capsicum spp. including paprika and red pepper, and rarely in Central American fruits such as Pouteria sapota, Cionosicyos macranthus, and Carludovica palmata.

The genus Capsicum is recognised by its five main domesticated species: Capsicum annuum, C. baccatum, C. chinense, C. frutescens, and C. pubescens. Paprika (Capsicum annuum L., Solanaceae) contains various carotenoids such as capsanthin, capsorubin, cryptocapsin, cucurbitaxanthin A, β-cryptoxanthin, capsanthin epoxide, zeaxanthin, and β-carotene; capsanthin and capsorubin are the characteristic carotenoids in paprika.

The red pepper is unique for its high xanthophyll content and composition, showing the most diverse carotenoid profile, consisting mainly of the yellow carotenoids β-carotene, violaxanthin, antheraxanthin, zeaxanthin, and the characteristic intense red ketocarotenoids capsanthin, capsorubin, and capsanthin-5,6-epoxide. These carotenoids are present at diverse profiles and varying levels, biosynthetically connected to the fruit maturity stages.

Esterification and Occurrence in Plant Tissues

Esterification of xanthophylls with fatty acids is a process that is contemporary with and directly linked to the transformation of chloroplast (present in the green fruit) into chromoplast (present in the red fruit). Capsanthin occurs in the un-esterified form, as monoester and as diester. Capsanthin esterified with lauric, palmitic, and myristic acids represented the predominant compounds in red pepper extracts. The most complex carotenoid profile is observed at the intermediate ripening stage, in which pepper may consist of up to sixty-four different free, partially and fully esterified carotenoids.

Biosynthesis

Capsanthin is an end product of the carotenoid biosynthesis pathway in pepper. A structurally related CrtL-type enzyme of cyclic xanthophyll biosynthesis, capsanthin/capsorubin synthase, has been identified in red pepper. The enzyme catalyses the conversion of antheraxanthin and violaxanthin into capsanthin and capsorubin respectively during chromoplast differentiation, the process that accompanies fruit ripening and colour change from green to red.

Commercial Forms and Preparations

Paprika extract is a concentrated oleoresin obtained by solvent extraction of dried red peppers (Capsicum annuum). The extract primarily contains the carotenoids capsanthin and capsorubin, responsible for the vivid orange-red hue. The manufacturing process involves extraction with food-grade solvents such as hexane or ethanol, followed by purification and standardization to ensure consistent pigment content. Once produced, the oleoresin may be dispersed in vegetable oil or emulsified in water for use in different food systems.

The composition of paprika extracts manufactured by different methods has been studied. Paprika extract produced with organic solvents may contain high levels of unsaturated fatty acids; in addition to fatty acids they also contain high quantities of tocopherols (0.9–1%). The main pigments of the extracts were identified as esters of lauric, myristic, and palmitic acid. Capsanthin is also available in purified or enriched form for use in scientific and nutraceutical contexts. Researchers have obtained above 50% capsanthin in capsanthin-enriched extract and extended the room-temperature stability of capsanthin-enriched pellets for more than one year.

Paprika oleoresin is an oil-derived product from red pepper with many carotenoids used for the colouration of sauces, soaps, and cosmetics. In supplemental contexts, capsanthin is delivered primarily as standardised paprika oleoresin capsules, oil suspensions, or as a constituent of paprika powder.

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2. Traditional and Historical Use

Pre-Columbian Americas

Capsicum annuum is an annual or perennial shrub first cultivated between 5200 and 3400 BC by the native Americans. Paprika, like all Capsicum varieties and their derivatives, is descended from wild ancestors from the Amazon River, cultivated in ancient times in South, Central, and North America, particularly in central Mexico. Peppers were being gathered and eaten in Mexico circa 7000 BC and were cultivated before 3500 BC.

Medicinal use of Capsicum has a long history, dating back to the Mayas who used them to treat asthma, coughs, and sore throats. The Aztecs used chile pungency to relieve toothaches. While these traditional uses are primarily attributed to the capsaicinoids, the whole red pepper fruit — which is rich in capsanthin — was also valued as a food colourant, flavouring, and nutritive ingredient across Mesoamerican cultures.

European Introduction and Spread

The peppers were introduced to Europe via Spain and Portugal in the 16th century. The Spaniards and Portuguese also took them to India and south-east Asia, and they were quickly taken up and grown in the Middle East, the Balkans, and Europe — to Italy by 1526, Germany by 1543, and known in Hungary by 1569. The Spanish conquistadors brought peppers back to Europe together with cocoa, potatoes, sweet potatoes, tobacco, maize, beans, and turkeys; they also brought them to the Spanish Philippines colonies, whence the plant spread to Asia; the Portuguese brought them to their African and Asiatic possessions, including India.

The ground and dried red pepper came to form the foundation of paprika, the spice central to Hungarian and Iberian culinary traditions. Red bell pepper (Capsicum annuum L.) has a long history of use as a vegetable, food colour, hot flavouring agent, and in traditional medicines. Capsanthin, as the dominant pigment responsible for paprika's characteristic deep red hue, was therefore ingested across multiple cultures and historical periods, even if it was not isolated or identified as a distinct compound until the modern era.

Due to its unique flavour, colour, and aroma, Capsicum annuum has been used in most food products; its vibrant colour is due to a combination of esters of capsorubin, capsanthin, cryptoxanthin, zeaxanthin, and other carotenoids. The isolation and structural elucidation of capsanthin as an individual carotenoid compound belongs to the 20th century, when carotenoid chemistry advanced sufficiently to separate and characterise the pigments of paprika by chromatographic and spectroscopic methods.

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3. Key Constituents and Chemical Context within Capsicum

Capsanthin is the principal pigment of red paprika and is typically accompanied by several other biologically active carotenoids. Paprika Capsicum annuum L. (Solanaceae) contains various carotenoids such as capsanthin, capsorubin, cryptocapsin, cucurbitaxanthin A, β-cryptoxanthin, capsanthin epoxide, zeaxanthin, and β-carotene. The co-occurring fatty acids and tocopherols in the oleoresin matrix may influence the bioavailability and stability of capsanthin in formulated products. The composition of the colorant E160c also includes certain fatty acids — oleic, linolenic, stearic, palmitic, and myristic.

Carotenoids enhance the value of pepper from a nutritional standpoint, despite being commonly prized for the pharmacologically active pungent capsaicinoids. Chili pepper is a good source of several vitamins like vitamin E, vitamin C, vitamin A, and vitamin B complex and minerals such as thiamine, folate, molybdenum, manganese, potassium, and calcium, as well as polyphenols. Capsanthin itself, as a tetraterpenoid xanthophyll, does not possess provitamin A activity (it is not converted to retinol in the body), distinguishing it metabolically from β-carotene.

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4. Mechanisms of Action

Antioxidant Activity

Capsanthin is a lipophilic red pigment belonging to the xanthophyll class of carotenoids; among other carotenoids, capsanthin is one of the most powerful antioxidants, able to scavenge radicals due to its structural characteristics. The characteristic chemical structure — a keto group in conjunction with a long chain of 11 conjugated dienes — is responsible for its strong radical scavenging and singlet oxygen quenching ability. Capsanthin and capsorubin function as antioxidants by scavenging free radicals and protecting lipids from peroxidation.

Capsanthin reduces hydrogen peroxide-induced production of reactive oxygen species (ROS) and phosphorylation of ERK and p38, and prevents hydrogen peroxide-induced inhibition of gap junction intercellular communication in WB-F344 rat liver epithelial cells. In neuronal models, capsanthin's unique physicochemical features suggest it could interrupt several nodes of the excitotoxic cascade by reinforcing endogenous antioxidant defenses (e.g., modulating SOD, CAT, GPx activity, and total antioxidant capacity) and nudging cytokine balance toward an anti-inflammatory profile.

Anti-inflammatory Activity

Capsanthin reduces ear edema in a mouse model of inflammation induced by phorbol 12-myristate 13-acetate (TPA). In atherosclerotic mouse models, capsanthin significantly reduced the levels of proinflammatory cytokines, such as TNF-α, interleukin-6, and monocyte chemoattractant protein-1, in the plasma of atherosclerotic mice; collectively, dietary capsanthin plays a protective role against atherosclerosis in hyperlipidemic mice, an effect attributable to its anti-inflammatory properties.

Lipid Metabolism and HDL-Cholesterol Modulation

The effects of dietary capsanthin on lipid metabolism were examined in young male Wistar rats fed diets containing paprika powder, paprika organic solvent extract, residue of paprika extract, and purified capsanthin. Administration of purified capsanthin for 2 weeks resulted in a significant increase in plasma HDL-cholesterol (P < 0.05) without detectable differences in plasma total cholesterol and TAG concentrations. Quantitative analyses of hepatic mRNA levels revealed that capsanthin administration resulted in up-regulation of mRNA for apoA5 and lecithin cholesterol acyltransferase (LCAT), without significant differences in other mRNA levels related to HDL-cholesterol metabolism; these results suggest that capsanthin had an HDL-cholesterol-raising effect on plasma, and the potential to increase cholesterol efflux to HDL particles by increasing apoA5 levels and/or enhancement of LCAT activity.

Antitumour Mechanisms

In human triple-negative breast cancer (TNBC) cells, capsanthin inhibited cell proliferation and delayed cell-cycle progression at the G1/S stage; cyclin A expression was suppressed, p21 expression was upregulated, and capsanthin inhibited EZH2 expression — an epigenetic regulator that binds to the p21 promoter in TNBC cells. In animal studies, capsanthin (0.2 mg/animal) reduced the number of colonic aberrant crypt foci and preneoplastic lesions in a rat model of N-methylnitrosourea-induced colon carcinogenesis.

Gut Microbiota Modulation

In murine obesity models, 16S rRNA gene sequencing of the cecal microbiota suggested that capsanthin increased the abundance of Bacteroidetes, Bifidobacterium, and Akkermansia, decreased the abundance of Ruminococcus, and reduced the ratio of Firmicutes/Bacteroidetes. These microbiome shifts are associated with improved metabolic health in rodent studies, though their translation to humans has not been directly established.

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5. Scientific Evidence by Health Area

5.1 Antioxidant Status and Oxidative Stress

Capsanthin and capsorubin show strong antioxidative effects. Dietary paprika carotenoids are absorbed in blood and detected in erythrocytes. Dietary capsanthin was absorbed into the body and distributed to plasma lipoproteins; xanthophylls, including capsanthin, are distributed to HDL in larger amounts than to LDL. The evidence for antioxidant activity is primarily drawn from in vitro studies and from animal feeding studies. Direct human clinical trials isolating the antioxidant effects of capsanthin specifically (as opposed to broader paprika or carotenoid supplementation) remain limited.

5.2 Cardiovascular Health and Lipid Metabolism

Animal evidence: Administration of purified capsanthin for 2 weeks in rats resulted in a significant increase in plasma HDL-cholesterol (P < 0.05); a statistically significant correlation (r = 0.567; P < 0.001) was found between dietary capsanthin concentrations and plasma HDL-cholesterol concentrations, and animals receiving two different capsanthin concentrations exhibited dose-dependent increases in plasma HDL-cholesterol (r = 0.597; P < 0.005).

Atherosclerosis model evidence: Dietary capsanthin plays a protective role against atherosclerosis in hyperlipidemic mice; this protective effect could be attributed to the anti-inflammatory properties of capsanthin.

Human-level evidence (broader Capsicum context): A meta-analysis of randomised controlled trials (RCTs) of capsaicin, capsinoids, and pepper-based interventions in overweight and obese humans found that significant reductions in triglycerides (WMD: −14.29 mg/dL; 95% CI: −27.01 to −1.58; p = 0.028) and total cholesterol (WMD: −9.97 mg/dL; 95% CI: −17.41 to −2.52; p = 0.009) were observed. However, no significant effects were observed on LDL cholesterol or HDL cholesterol levels. Importantly, this meta-analysis examined capsaicin and pepper-based interventions broadly; the evidence does not isolate the specific contribution of capsanthin.

Evidence strength for cardiovascular effects: Promising at animal and in vitro level; human evidence remains indirect, with capsanthin not yet evaluated in dedicated cardiovascular RCTs in isolation.

5.3 Obesity and Body Composition

Animal evidence: The anti-obesity effects and mechanism of capsanthin (CAP) were investigated in high-fat diet-induced obese C57BL/6J mice; compared with untreated mice on a high-fat diet for 12 weeks, CAP at 200 mg kg⁻¹ reduced body weight by 27.5%, significantly reversed glucose tolerance, effectively decreased serum triglycerides, total cholesterol, LDL cholesterol, and trimethylamine N-oxide levels, and markedly increased microbial diversity.

The serum glucose, total cholesterol, LDL and HDL triglyceride contents were lower in the groups treated with capsanthin-enriched pellets and capsaicin pellets than in the control group fed high-fat diet, whereas the obesity marker adiponectin was significantly higher in the groups fed capsanthin-enriched pellets and capsaicin pellets. The groups receiving capsanthin-enriched pellets and capsaicin pellets had significantly reduced concentrations of leptin, free fatty acids, and insulin. There was no change in liver mass in all groups, but there was a significant reduction in adipose tissues (inguinal and epididymal white) in all the mice receiving capsanthin-enriched pellets and capsaicin pellets compared to the HFD group.

Human evidence: The effect of red paprika capsanthin on obesity in both animal and human models has been reported. However, high-quality, isolated human RCTs specifically evaluating supplemental capsanthin for weight management are not yet available in the published literature. These carotenoids show preventive effects of obesity-related diseases, though this statement, as published in the review literature, is primarily supported by preclinical data.

Evidence strength: Preclinical evidence is consistent and mechanistically plausible; human-specific RCT evidence for capsanthin as an isolated agent is currently lacking.

5.4 Anticancer and Chemopreventive Activity

In vitro and animal evidence: Capsanthin is a naturally occurring red pepper carotenoid with possible antitumour activity. In triple-negative breast cancer (TNBC) cells, capsanthin delayed cell-cycle progression at the G1/S stage, suppressed cyclin A expression, and upregulated p21 expression. Capsanthin was found to have synthetic (synergistic) effects when combined with erlotinib (Tarceva); in animal experiments, capsanthin-induced inhibition of TNBC cell proliferation decreased the incidence of initiation and growth of TNBC cell–derived tumours in mice.

Capsanthin at 0.2 mg/animal reduced the number of colonic aberrant crypt foci and preneoplastic lesions in a rat model of N-methylnitrosourea-induced colon carcinogenesis. Chemopreventive, antitumour, skin photo-protective, anti-inflammatory, and antidiabetic activities demonstrated by capsanthin are a consequence of its potent antioxidant action.

Evidence strength: All anticancer evidence for capsanthin specifically is in vitro or from animal models. No human clinical trials on capsanthin's anticancer effects have been published. Results are preliminary and should be interpreted accordingly.

5.5 Neuroprotection

Building upon capsanthin's established anti-inflammatory and antioxidant capabilities, researchers have hypothesised that it exerts neuroprotective effects, particularly against glutamate-mediated excitotoxicity. Capsanthin's unique physicochemical features suggest it could interrupt several nodes of the excitotoxic cascade by reinforcing endogenous antioxidant defenses (e.g., modulating SOD, CAT, GPx activity, and total antioxidant capacity) and nudging cytokine balance toward an anti-inflammatory profile, potentially protecting neurons from glutamate-initiated damage and limiting the progression toward apoptosis. Despite this background, mechanistic evidence for capsanthin in neuronal excitotoxic stress remains limited.

A 2025 study published in Nutrients (Pap et al., University of Pécs) examined whether capsanthin protects RA-differentiated SH-SY5Y neuron-like cells against glutamate-induced stress. Neuronal dysfunction was induced by glutamate exposure, and capsanthin treatment was evaluated using cell viability, reactive oxygen species (ROS) production, antioxidant defense markers, inflammatory cytokines, mitochondrial energy status, and apoptosis-related endpoints.

Evidence strength: Purely in vitro at this stage. No animal or human studies on neuroprotective effects of capsanthin have been reported as of the literature available.

5.6 Skin Photoprotection

Researchers compared the DNA-protection and antioxidant effects of capsanthin and capsorubin exclusively synthesised in red pepper to the xanthophyll lutein. Preincubation of human dermal fibroblasts (hdf) with capsanthin and capsorubin significantly counteracted UVB-induced cytotoxicity at doses between 0 and 300 mJ cm⁻². Pretreatment of hdf with capsanthin, capsorubin, or lutein (1 μM) significantly decreased the formation of DNA strand breaks following irradiation with UVB light. All carotenoids studied decreased caspase-3 cleavage (a marker for UVB-induced apoptosis). These findings indicate that capsanthin and capsorubin exhibit similar properties to lutein and could be used as a dietary supplement to improve natural photoprotection.

Evidence strength: Cell-culture (in vitro) evidence only in human dermal fibroblasts. No clinical trials examining dietary or topical capsanthin for photoprotection in living human subjects have been published.

5.7 Athletic Endurance and Exercise Performance

Capsanthin-containing paprika carotenoids have been reported to contribute to upregulating endurance performance of athletes by reducing oxygen consumption (VO₂) and the heart rate. This claim, referenced in a Springer review chapter on biological activities of paprika carotenoids, appears to derive from studies of dietary paprika supplementation in athletes rather than from purified capsanthin trials.

Evidence strength: Very limited; the relevant data from dietary paprika supplementation are not yet replicated in controlled trials of isolated capsanthin.

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6. Body Systems and Health Areas of Association

• Cardiovascular system: HDL-cholesterol modulation; antiatherosclerotic and anti-inflammatory effects in vascular tissue (animal data).
• Metabolic system / adipose tissue: Anti-obesity, anti-adipogenic, and antihyperlipidaemic activities in animal models; gut microbiota modulation.
• Oncology / chemopreventive: Cell-cycle arrest, apoptosis induction, and epigenetic modulation in cancer cell lines; reduction of preneoplastic lesions in rodent models.
• Central nervous system: In vitro evidence for neuroprotection against oxidative and excitotoxic stress.
• Skin / integument: Protection of dermal fibroblasts against UVB-induced DNA strand breaks in vitro.
• Immune system: Modulation of proinflammatory cytokines (TNF-α, IL-6, MCP-1) in animal inflammation models.

Chemopreventive, antitumour, skin photo-protective, anti-inflammatory, and antidiabetic activities demonstrated by capsanthin are a consequence of its potent antioxidant action. Anti-obesity, anti-adipogenic, and antihyperlipidaemic activities are some of the more important features of capsanthin.

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7. Dosage Forms and Reported Dosages

Capsanthin is encountered in the scientific literature in the following dose contexts:

• Animal (rat) dietary studies — HDL-cholesterol: Young male Wistar rats were fed diets containing paprika powder, paprika organic solvent extract, residue of paprika extract, and purified capsanthin. Administration of purified capsanthin for 2 weeks resulted in a significant increase in plasma HDL-cholesterol.
• Animal (mouse) obesity model — body weight / metabolic parameters: Capsanthin (CAP) at 200 mg kg⁻¹ in high-fat diet-fed mice for 12 weeks reduced body weight by 27.5%.
• Animal (rat) colon carcinogenesis model: Capsanthin at 0.2 mg/animal reduced the number of colonic aberrant crypt foci and preneoplastic lesions in a rat model.
• In vitro photoprotection: Pretreatment of human dermal fibroblasts with capsanthin at 1 μM significantly decreased the formation of DNA strand breaks following UVB irradiation.
• Regulatory reference — food coloring: The maximum allowable dose of E160c has been set at 24 mg/kg body weight/day by regulatory guidance.

No standardised human supplemental dosage for capsanthin has been established. Published human clinical trials specifically evaluating capsanthin as an isolated compound have not been identified in the accessible literature; dosages reported above are exclusively from preclinical (animal and cell culture) research contexts.

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8. Safety, Toxicology, and Regulatory Status

Regulatory Status

Paprika extract (E 160c) is a natural dye allowed as a food additive in the EU. Both the European Food Safety Authority (EFSA) and the U.S. Food and Drug Administration (FDA) consider paprika extracts to be safe when used within recommended concentrations. EFSA's most recent re-evaluation opinion (EFSA Journal 2015;13(12):4318) reaffirmed its safety, noting that no genotoxic, reproductive, or carcinogenic effects were observed even at doses well above estimated daily intakes. EFSA and JECFA (Joint FAO/WHO Expert Committee on Food Additives) have both reviewed toxicological data showing no adverse effects even at high intake levels.

Bioavailability

Paprika extract (E 160c) is a natural dye allowed as a food additive in the EU; the bioavailability of capsanthin and capsorubin from paprika extract is very low. The absorption and bioavailability of carotenoids strongly depend on the matrix in which they are administered and may differ between unsaponified and saponified preparations, and will be influenced by the presence of solubilisers in the additive. Humans may have the potential metabolic activity for the oxidation of secondary hydroxyl groups in various xanthophylls — specifically, the formation of capsanthon from capsanthin by oxidation of the 3′-hydroxyl group to the 3′-keto group. The bioavailability of the pepper-specific carotenoids capsanthin and capsorubin from paprika oleoresin was found to be very low.

Toxicological Data

Toxicological data were limited to a 13-week oral toxicity study and one chronic toxicity and carcinogenicity study on a specified paprika extract (DN-933), representative of commercially produced paprika extracts used as food colour. In the official EFSA scientific evaluation of additive E160c, no serious toxic effects were reported even at high intake levels; however, exceeding the safe intake level (NOAEL) was associated with minor histopathological changes in tissues.

The oral LD₅₀ of capsanthin in mice is greater than 1.7 g/kg. As a compound extracted from red pepper, it carries a high inherent safety profile at food-relevant doses.

Genotoxicity and Carcinogenicity

Studies have shown no evidence that E160c has genotoxic properties. EFSA's 2015 re-evaluation, based on GLP-compliant genotoxicity assessments, concluded the absence of genotoxic concern for paprika extract at relevant intake levels.

Stability Considerations

Capsanthin shows good emulsification and dispersion properties, heat resistance, and acid resistance, but relatively poor light resistance; it is stable to metal ions and has strong colouring power. At the end of the extraction process, solvents are evaporated, which can cause heat degradation of carotenoids. The lipophilic nature of capsanthin means that formulation with fats or oils enhances both stability and bioavailability in food applications.

Notable Limitations and Research Gaps

Capsanthin has not been studied as extensively as other carotenoids, such as beta-carotene, lutein, lycopene, astaxanthin, and zeaxanthin. Since the health benefits of capsanthin were only discovered recently, it is necessary to investigate its effects on various diseases. The predominance of preclinical data (animal and in vitro), the low oral bioavailability of capsanthin from standard dietary sources, and the absence of dedicated human RCTs mean that definitive clinical recommendations cannot currently be made. Studies using enriched or saponified forms aim to address the bioavailability limitation, but this research is at an early stage.

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