# Citrus × sinensis (Blood Orange)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/citrus-sinensis
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-04
**Evidence Score:** 2 / 10
**Category:** Fruit
**Also Known As:** Blood orange, Red orange, Sicilian blood orange, Arancia rossa, Orange sanguine, Naranja sanguina, Moro orange, Tarocco orange, Sanguinello orange

## Overview

Blood orange (Citrus × sinensis) is distinguished by its high concentration of anthocyanins, particularly cyanidin-3-glucoside, which drives its antioxidant activity through [free radical scaveng](/ingredients/condition/antioxidant)ing and modulation of oxidative stress pathways. It also contains polymethoxylated flavones and vitamin C, collectively contributing to its phenolic profile and biological activity observed in laboratory studies.

## Health Benefits

• Contains anthocyanins (cyanidin-3-glucoside) that provide antioxidant activity - evidence from in vitro studies only
• Rich in polymethoxylated flavones showing [free radical scaveng](/ingredients/condition/antioxidant)ing activity (IC50 2.07-92 µM) - preliminary laboratory evidence
• Provides vitamin C and phenolic compounds (441-527 mg/L gallic acid equivalents) - compositional data only, no clinical outcomes
• Contains volatile compounds like limonene (63-90% of aroma profile) - chemical analysis only, no health effects studied
• Source of carotenoids and essential fatty acids including linoleic acid (23-32%) - compositional data without clinical validation

## Mechanism of Action

Cyanidin-3-glucoside, the primary anthocyanin in blood orange, scavenges [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) by donating hydrogen atoms and chelating transition metals, inhibiting lipid peroxidation chain reactions. Polymethoxylated flavones such as nobiletin and tangeretin modulate NF-κB signaling pathways and inhibit pro-[inflammatory](/ingredients/condition/inflammation) cyclooxygenase (COX) enzymes in vitro, with IC50 values ranging from 2.07 to 92 µM depending on the specific compound and assay. Vitamin C (ascorbic acid) regenerates oxidized forms of vitamin E and directly neutralizes superoxide and hydroxyl radicals, complementing the flavonoid-mediated antioxidant activity.

## Clinical Summary

The majority of evidence supporting blood orange's bioactivity derives from in vitro studies measuring [free radical scaveng](/ingredients/condition/antioxidant)ing capacity (DPPH and FRAP assays) and cell-based oxidative stress models, rather than randomized controlled trials. Limited human studies have examined blood orange juice consumption, with one small pilot study suggesting modest reductions in markers of oxidative stress, though sample sizes were insufficient to draw firm conclusions. Phenolic compound concentrations of 441–527 mg/L have been documented in blood orange juice, providing a quantifiable phytochemical baseline, but clinical dose-response data in humans remains scarce. Overall, the evidence base is preliminary, and no blood orange supplement has received regulatory approval for specific health claims.

## Nutritional Profile

Per 100 g fresh fruit: Energy ~50-55 kcal; Water ~86-87 g; Carbohydrates ~11-12 g (sugars ~8-9 g, primarily sucrose, glucose, fructose); Dietary fiber ~2.0-2.4 g (both soluble pectin and insoluble fractions); Protein ~0.9-1.0 g; Fat ~0.1-0.2 g. VITAMINS: Vitamin C (ascorbic acid) ~50-60 mg (higher than common sweet oranges in some cultivars, bioavailability high at ~70-90% absorption); Folate (B9) ~30 µg; Thiamine (B1) ~0.09 mg; Vitamin A (as β-carotene) ~70-100 µg RAE; Vitamin B6 ~0.06 mg. MINERALS: Potassium ~180-200 mg; Calcium ~40-43 mg (relatively low bioavailability ~30-40% due to competing organic acids); Magnesium ~10-12 mg; Phosphorus ~17-20 mg; Iron ~0.3 mg (non-heme, bioavailability enhanced by co-present vitamin C). BIOACTIVE COMPOUNDS — ANTHOCYANINS (distinguishing feature from common oranges): Cyanidin-3-glucoside (primary, ~30-190 mg/L in juice depending on cultivar and cold exposure), cyanidin-3,6''-malonylglucoside, cyanidin-3-(6''-dioxalylglucoside), delphinidin-3-glucoside (trace); anthocyanin accumulation is cold-dependent and varies widely by cultivar (Moro > Tarocco > Sanguinello). FLAVONOIDS: Hesperidin ~20-45 mg/100 mL juice (primary flavanone glycoside, bioavailability limited by colonic microbiota-dependent deglycosylation); Narirutin ~3-8 mg/100 mL; Polymethoxylated flavones (PMFs) including sinensetin, nobiletin (~0.5-2 mg/100 mL), tangeretin — these are more lipophilic and show moderate oral bioavailability. HYDROXYCINNAMIC ACIDS: Ferulic acid, caffeic acid, sinapic acid, p-coumaric acid (collectively ~5-20 mg/100 mL juice); chlorogenic acid present in small quantities. Total phenolic content ~441-527 mg/L gallic acid equivalents in juice. CAROTENOIDS: β-cryptoxanthin, violaxanthin, β-carotene (total ~0.5-1.5 mg/100 g pulp, lower than in some cultivars due to anthocyanin-dominant pigmentation); bioavailability enhanced by co-consumed dietary fat. VOLATILE COMPOUNDS: Limonene (dominant, ~85-95% of essential oil fraction), linalool, myrcene, α-pinene, decanal, octanal contributing to aroma and potential minor bioactivity. ORGANIC ACIDS: Citric acid ~0.8-1.2 g/100 mL (predominant), malic acid ~0.1-0.3 g/100 mL; these enhance mineral (especially iron) bioavailability and modulate glycemic response. PECTIN: ~0.5-1.0 g/100 g in pulp (soluble fiber fraction); known to reduce rate of glucose absorption and bind bile acids. BIOAVAILABILITY NOTES: Anthocyanins have notably low systemic bioavailability (~1-2% absorbed intact), though colonic metabolites (protocatechuic acid, phloroglucinaldehyde) may contribute to biological effects; hesperidin requires microbial conversion to hesperetin for absorption (Tmax ~5-7 h); vitamin C bioavailability is high but degrades rapidly with heat and storage; juice processing reduces anthocyanin content by 20-40% compared to fresh consumption.

## Dosage & Preparation

No clinically studied dosage ranges have been established for blood orange extracts, powders, or standardized forms due to the absence of human trials. Studies mention compositional analyses but provide no therapeutic dosing recommendations or standardization protocols. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Blood orange consumed as food or juice is generally recognized as safe (GRAS) for most adults, though individuals with citrus allergies should avoid it due to cross-reactive proteins including lipid transfer proteins (LTPs). Like other citrus fruits, blood orange contains furanocoumarins at lower levels than grapefruit, but high-dose concentrated extracts may theoretically inhibit CYP3A4 enzymes, potentially interacting with drugs such as statins, calcium channel blockers, and immunosuppressants. Vitamin C content can enhance non-heme iron absorption, which is a consideration for individuals with hemochromatosis. Blood orange is considered safe during pregnancy when consumed in normal dietary amounts, but high-dose anthocyanin or flavone supplements have not been evaluated in pregnant or breastfeeding populations.

## Scientific Research

The research dossier reveals no human clinical trials, RCTs, or meta-analyses have been conducted on blood orange extracts or isolated compounds for biomedical applications. Available data focuses solely on chemical composition analyses and in vitro [antioxidant activity](/ingredients/condition/antioxidant) assessments, with one referenced analysis (PMID: 16254888) characterizing anthocyanins in blood orange juice but reporting no clinical outcomes.

## Historical & Cultural Context

No specific historical or traditional medicinal uses for blood orange are documented in the available research. While general citrus fruits are noted for nutritional value including vitamin C and potassium content, blood orange lacks documented use in traditional medicine systems such as Ayurveda or Traditional Chinese Medicine.

## Synergistic Combinations

Vitamin C, citrus bioflavonoids, quercetin, grape seed extract, green tea polyphenols

## Frequently Asked Questions

### What makes blood oranges different from regular oranges nutritionally?

Blood oranges uniquely accumulate anthocyanins, especially cyanidin-3-glucoside, which are absent or minimal in standard navel or Valencia oranges; this pigment develops in response to cold night temperatures during ripening. Blood oranges also tend to have higher concentrations of polymethoxylated flavones such as nobiletin and tangeretin, and their total phenolic content (441–527 mg/L in juice) can exceed that of common orange varieties.

### Can blood orange extract interact with medications?

Concentrated blood orange extracts may inhibit CYP3A4, the liver enzyme responsible for metabolizing many common drugs including atorvastatin, amlodipine, and cyclosporine, potentially raising their plasma levels and risk of side effects. While grapefruit's furanocoumarin-mediated CYP3A4 inhibition is well-documented, blood orange's risk is considered lower but not fully characterized for high-dose supplements. Individuals on prescription medications should consult a healthcare provider before using blood orange supplements beyond normal dietary intake.

### What is the antioxidant potency of blood orange compared to other fruits?

Blood orange exhibits DPPH free radical scavenging IC50 values of approximately 2.07–92 µM for its polymethoxylated flavone fractions in vitro, which is competitive with many well-studied fruits, though direct head-to-head clinical comparisons are limited. Cyanidin-3-glucoside contributes significantly to ORAC and FRAP scores, and total phenolic concentrations of 441–527 mg/L in juice reflect a robust polyphenol matrix. However, in vitro antioxidant assays do not reliably predict in vivo bioavailability or clinical outcomes.

### How much vitamin C does a blood orange contain?

A medium blood orange (approximately 130–150 g) typically provides 60–80 mg of vitamin C, covering roughly 67–89% of the adult recommended daily intake of 90 mg (RDI for men) per the NIH dietary guidelines. Vitamin C in blood oranges exists alongside ascorbic acid-regenerating flavonoids, which may enhance its net antioxidant effect in the body. Exact content varies by cultivar, growing region, and ripeness at harvest.

### Is there clinical evidence that blood orange supplements reduce inflammation?

Direct clinical evidence for blood orange supplements reducing inflammation in humans is currently limited to small pilot studies and anecdotal reports, without large-scale randomized controlled trials confirming efficacy. In vitro studies demonstrate that nobiletin and tangeretin inhibit COX enzymes and suppress NF-κB-mediated cytokine release (including IL-6 and TNF-α) at micromolar concentrations, but bioavailability of these compounds after oral ingestion in humans requires further study. Until adequately powered clinical trials are completed, anti-inflammatory claims for blood orange supplements should be considered preliminary.

### What is the difference between blood orange extract and whole blood orange fruit for supplement purposes?

Blood orange extracts concentrate anthocyanins and polymethoxylated flavones, achieving higher phytochemical levels per dose than whole fruit, but most evidence for these compounds comes from laboratory studies rather than human trials. Whole blood oranges provide the complete nutrient matrix including vitamin C, fiber, and polyphenols in their natural ratios, though you would need to consume multiple fruits to match extract concentrations. Extract forms offer convenience and standardized dosing, while whole fruit provides broader nutritional benefits with established dietary safety. The choice depends on whether you prioritize concentrated active compounds versus comprehensive food-based nutrition.

### Is blood orange safe for children and pregnant women?

Whole blood oranges are safe for children and pregnant women as part of normal diet, providing essential vitamin C and nutrients; however, concentrated blood orange supplements lack sufficient human safety data in these populations and should not be used without medical guidance. The anthocyanins and other phytochemicals in blood orange extracts have only been studied in laboratory and animal models, not in pregnant or pediatric human subjects. Food-based blood orange consumption is nutritionally beneficial and well-tolerated, but supplement supplementation requires consultation with a healthcare provider for these vulnerable groups. Vitamin C from blood orange is particularly important during pregnancy for fetal development when obtained from whole food sources.

### Can I get sufficient blood orange phytochemicals from eating the fruit instead of taking a supplement?

One medium blood orange provides approximately 70 mg of vitamin C and measurable levels of anthocyanins and polymethoxylated flavones, but the specific bioactive concentrations that show laboratory activity (like the 2.07-92 µM range tested in vitro) would require consuming multiple oranges daily. Current evidence for blood orange's antioxidant benefits is limited to laboratory studies and compositional analysis; no human clinical trials have established optimal dietary amounts needed for health effects. Eating 1-2 blood oranges daily contributes meaningfully to overall antioxidant intake and provides additional fiber, minerals, and nutrients not found in extracts. If targeting specific laboratory-studied compounds, extracts offer higher concentration, but whole fruit consumption aligns with established dietary recommendations and has well-documented safety.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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