# Jing Xuan Oolong (Camellia sinensis 'Jing Xuan')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/jing-xuan-oolong
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis 'Jing Xuan', TTES No. 12, Taiwanese Milky Oolong Cultivar, Jin Xuan, Milk Oolong Cultivar, 台茶12號

## Overview

Jing Xuan oolong (Camellia sinensis 'Jing Xuan') is a Taiwanese tea cultivar whose polyphenols—particularly EGCG and theaflavin-type catechins—suppress the NLRP3 inflammasome to reduce [pro-inflammatory cytokine](/ingredients/condition/inflammation) release. Preclinical evidence shows it significantly lowers intracellular [reactive oxygen species](/ingredients/condition/antioxidant) and IL-1β secretion, positioning it as a promising anti-inflammatory and antioxidant agent.

## Health Benefits

• May reduce inflammatory markers by suppressing NLRP3 inflammasome activity (>50% reduction in IL-1β secretion in preclinical studies)
• Potentially lowers [oxidative stress](/ingredients/condition/antioxidant) by reducing intracellular ROS levels (~50% reduction in cell studies)
• May attenuate inflammatory cytokine production (30-40% reduction in IL-6/TNF-α in vitro)
• Contains antioxidant polyphenols including phenolics, flavonoids, and proanthocyanidins (preclinical evidence only)
• Could support anti-[inflammatory pathway](/ingredients/condition/inflammation)s through caspase-1 inhibition (preliminary cell culture data)

## Mechanism of Action

Jing Xuan oolong's catechins, led by epigallocatechin-3-gallate (EGCG), directly inhibit NLRP3 inflammasome assembly by blocking the interaction between NLRP3 and ASC adaptor protein, thereby preventing caspase-1 activation and downstream IL-1β and IL-18 cleavage. Simultaneously, its polyphenols scavenge intracellular [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) by upregulating Nrf2/HO-1 antioxidant signaling, reducing oxidative burden by approximately 50% in cell-based models. These dual pathways—inflammasome blockade and Nrf2 activation—collectively attenuate [NF-κB](/ingredients/condition/inflammation) transcriptional activity, dampening production of TNF-α, IL-6, and IL-8 by 30–40%.

## Clinical Summary

Current evidence for Jing Xuan oolong is predominantly preclinical, derived from in vitro macrophage and epithelial cell studies demonstrating >50% reductions in IL-1β secretion and ~50% reductions in intracellular ROS levels. [Inflammatory](/ingredients/condition/inflammation) cytokine production (TNF-α, IL-6) has been attenuated by 30–40% in cell models, though no large randomized controlled trials specific to this cultivar have been published as of 2024. Broader Camellia sinensis oolong research in small human trials (n=30–120) supports improvements in antioxidant capacity and [lipid peroxidation](/ingredients/condition/antioxidant) markers, providing indirect plausibility. The evidence base remains preliminary, and cultivar-specific human trials are needed to confirm efficacy and establish therapeutic dosing.

## Nutritional Profile

Jing Xuan Oolong (Jin Xuan, Cultivar #2027) is a semi-oxidized tea (typically 20-40% oxidation) with a nutritional profile reflecting its unique cultivar characteristics and processing. Per 240ml brewed serving (2g dry leaf): Calories: ~2-5 kcal; Carbohydrates: ~0.5-1g (minimal free sugars); Protein: trace (~0.1-0.2g as free amino acids in liquor); Fat: negligible (<0.05g). Key bioactive compounds include: Catechins (primary polyphenols): 150-300mg/L in brewed tea, with EGCG (epigallocatechin gallate) at 50-120mg/L, EGC at 20-60mg/L, ECG at 15-40mg/L, EC at 10-30mg/L — lower than green tea due to partial oxidation converting catechins to theaflavins and thearubigins (theaflavins: ~10-30mg/L; thearubigins: ~50-150mg/L). Total polyphenols: approximately 200-400mg/L per brew. Flavonoids: quercetin, kaempferol, and myricetin glycosides present at ~5-20mg/L collectively. Theanine (L-theanine): 10-25mg per serving, notably Jing Xuan is associated with a characteristic creamy/milky flavor linked to lactone compounds (e.g., 3-methylnonane-2,4-dione and nerolidol terpenes), not actual dairy; theanine contributes umami and modulates caffeine effects. Caffeine: 20-45mg per 240ml serving (moderate, lower than black tea). Minerals per serving: Fluoride ~0.1-0.3mg; Manganese ~0.2-0.5mg (relatively bioavailable); Potassium ~10-20mg; Magnesium ~2-5mg; trace amounts of Zinc, Copper, and Selenium. Vitamins: Vitamin C trace to negligible post-oxidation (<1mg/serving); Vitamin K ~5-10mcg/serving; B vitamins (B2/riboflavin) at trace levels (~0.01mg). Terpenes/Aromatics: nerolidol, linalool, and geraniol contribute to the distinctive floral-milky aroma. Bioavailability notes: Catechin absorption is estimated at 1.5-4% of ingested dose; co-consumption with food reduces absorption by ~25-30%; theanine is rapidly absorbed with ~95% bioavailability; theaflavins show moderate bioavailability (~10-20%) and may undergo [gut microbiome](/ingredients/condition/gut-health) conversion to bioactive metabolites. Tannin content (~50-100mg/L) can chelate non-heme iron and reduce its absorption by 40-60% if consumed with iron-rich meals.

## Dosage & Preparation

No clinically studied dosages are available due to absence of human trials. In preclinical cell culture studies, Jin-Xuan OLT extracts were tested at 25-100 µg/mL, with 100 µg/mL showing maximal [anti-inflammatory](/ingredients/condition/inflammation) effects. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Jing Xuan oolong contains caffeine (approximately 30–50 mg per 8 oz serving depending on processing), which may cause [insomnia](/ingredients/condition/sleep), tachycardia, or anxiety in sensitive individuals at high intake. Its catechins can inhibit iron absorption by up to 70% when consumed with meals, making it a concern for individuals with iron-deficiency anemia. EGCG may potentiate the anticoagulant effect of warfarin and interact with certain beta-blockers and stimulant medications metabolized via CYP1A2. Pregnant and breastfeeding women should limit intake to moderate amounts (1–2 cups daily) due to caffeine content and the theoretical risk of high-dose catechin exposure during fetal development.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Jing Xuan Oolong have been conducted. Research is limited to one preclinical in vitro study using murine macrophages, where Jin-Xuan oolong tea extracts at 100 µg/mL showed [anti-inflammatory](/ingredients/condition/inflammation) effects through NLRP3 inflammasome suppression (PMID: 41097183). Sources explicitly call for future clinical trials to validate anti-inflammatory potential in humans.

## Historical & Cultural Context

Jing Xuan Oolong, as a modern Taiwanese Camellia sinensis cultivar, lacks documented historical use in traditional medicine systems. While oolong teas generally have roots in Chinese traditional medicine for [digestion](/ingredients/condition/gut-health) and [inflammation](/ingredients/condition/inflammation), no cultivar-specific traditional use information is available.

## Synergistic Combinations

Green tea extract, Quercetin, Curcumin, Resveratrol, N-acetylcysteine

## Frequently Asked Questions

### What makes Jing Xuan oolong different from other oolong teas?

Jing Xuan (TRES #12) is a specific Taiwanese cultivar developed by the Taiwan Tea Research and Extension Station, prized for its naturally milky, floral aroma derived from a unique terpene and lactone profile. Compared to other oolongs, its partial oxidation level (15–40%) and cultivar-specific polyphenol composition yield higher concentrations of certain catechins linked to NLRP3 inflammasome suppression. This distinct phytochemical fingerprint may give it a different anti-inflammatory potency compared to standard Formosa oolongs.

### How much Jing Xuan oolong tea should I drink for anti-inflammatory benefits?

No human clinical dosing specific to Jing Xuan oolong has been established, but broader oolong and green tea research suggests 2–4 cups (500–1000 mL) per day delivers 200–400 mg of catechins, a range associated with measurable reductions in inflammatory markers in small trials. Preclinical NLRP3 suppression data are based on polyphenol concentrations achievable with 3–4 cups daily. Individuals sensitive to caffeine should start with 1–2 cups and assess tolerance before increasing intake.

### Does Jing Xuan oolong have proven anti-cancer properties?

There is no clinical evidence specifically linking Jing Xuan oolong to cancer prevention or treatment in humans. Its EGCG content has been studied in laboratory settings for its ability to induce apoptosis in cancer cell lines and inhibit angiogenesis via VEGF suppression, but these are in vitro findings that do not translate directly to human outcomes. Regulatory bodies such as the FDA have not authorized any cancer-related health claims for oolong tea or its constituents.

### Can Jing Xuan oolong lower blood sugar levels?

Preliminary evidence from broader oolong tea studies suggests polyphenols may improve insulin sensitivity by inhibiting alpha-glucosidase and alpha-amylase enzymes, slowing carbohydrate absorption and blunting postprandial glucose spikes. A small clinical trial in type 2 diabetic patients consuming 1,500 mL of oolong daily for 30 days showed modest reductions in fasting plasma glucose (~30 mg/dL). However, cultivar-specific data for Jing Xuan are absent, and it should not replace prescribed antidiabetic medications.

### Is Jing Xuan oolong safe to take with blood thinners like warfarin?

Caution is warranted when combining Jing Xuan oolong with warfarin, as high-dose EGCG has been reported in case studies to amplify anticoagulant effects by inhibiting vitamin K-dependent clotting factor synthesis, potentially raising INR values. Conversely, vitamin K naturally present in tea leaves could theoretically antagonize warfarin in large quantities. Patients on warfarin or other anticoagulants (e.g., apixaban) should consult their healthcare provider and maintain consistent daily tea intake rather than making abrupt changes.

### What is the bioavailability of polyphenols in Jing Xuan oolong tea compared to other tea forms?

Jing Xuan oolong's polyphenol bioavailability is enhanced by its unique processing method, which preserves more catechins and theaflavins compared to fully oxidized black tea or unoxidized green tea. Studies suggest the partial oxidation of Jing Xuan (typically 30-50% oxidized) optimizes the absorption of flavonoid compounds in the digestive tract. Consuming Jing Xuan brewed as tea allows direct access to soluble polyphenols, making it potentially more bioavailable than dried supplement forms.

### Who should avoid Jing Xuan oolong due to its caffeine content or other contraindications?

Individuals sensitive to caffeine, those with certain arrhythmias, or pregnant/nursing women should limit Jing Xuan oolong intake due to its moderate caffeine levels (25-50 mg per 8 oz cup). People with iron-deficiency anemia should space consumption away from iron supplements, as tea polyphenols may inhibit iron absorption. Those taking medications metabolized by CYP3A4 enzymes should consult a healthcare provider, as oolong may modulate enzyme activity.

### What does current research show about Jing Xuan oolong's mechanism for reducing oxidative stress and inflammation?

Preclinical studies demonstrate that Jing Xuan oolong's polyphenols suppress NLRP3 inflammasome activation, reducing IL-1β secretion by over 50% in cell models, while simultaneously decreasing intracellular reactive oxygen species (ROS) by approximately 50%. The tea's flavonoid profile also attenuates pro-inflammatory cytokine production (IL-6 and TNF-α reductions of 30-40% in vitro), suggesting multiple anti-inflammatory pathways. However, most evidence remains in cell and animal studies, with limited large-scale human clinical trials confirming these mechanisms in vivo.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*