# Gao Shan Oolong (Camellia sinensis 'Gao Shan')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/gao-shan-oolong
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-05
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Camellia sinensis 'Gao Shan', High Mountain Oolong, Taiwan High Mountain Oolong, Alpine Oolong, Gao Shan Cha, High Altitude Oolong, Taiwanese Mountain Oolong, Elevation Oolong

## Overview

Gao Shan Oolong is a high-altitude Taiwanese cultivar of Camellia sinensis whose partially oxidized leaves are rich in catechins, theaflavins, and EGCG, which modulate lipid [metabolism](/ingredients/condition/weight-management) and inhibit fat absorption. Its unique elevation-driven terpene and polyphenol profile differentiates it from lower-altitude oolongs, contributing to documented effects on triglyceride reduction and body weight management.

## Health Benefits

• Weight management: 64-70% of overweight subjects lost >1kg in 6 weeks (moderate evidence from uncontrolled trial, n=102) • [Cardiovascular](/ingredients/condition/heart-health) support: Reduced plasma triglycerides and cholesterol in hyperlipidemic subjects (preliminary evidence from same trial) • Dental health: Significantly reduced plaque deposition vs control in double-blind crossover trial (moderate evidence, n=35) • Metabolic enhancement: Increased energy expenditure by 10% over 120 minutes (preliminary evidence from metabolic studies) • [Anti-inflammatory](/ingredients/condition/inflammation) effects: Reduced IL-6, TNF-α, and improved gut microbiota in animal models only (preliminary evidence)

## Mechanism of Action

The catechins in Gao Shan Oolong, particularly epigallocatechin-3-gallate (EGCG), inhibit catechol-O-methyltransferase (COMT), prolonging norepinephrine signaling and upregulating [thermogenesis](/ingredients/condition/weight-management) in brown adipose tissue. Theaflavins and thearubigins inhibit pancreatic lipase activity, reducing dietary fat hydrolysis and subsequent triglyceride absorption in the small intestine. Additionally, polyphenol-driven activation of AMP-activated protein kinase (AMPK) suppresses hepatic lipogenesis and promotes fatty acid beta-oxidation, contributing to observed reductions in plasma cholesterol and triglycerides.

## Clinical Summary

The primary available evidence comes from a single uncontrolled trial (n=102) in overweight and hyperlipidemic subjects, in which 64–70% of participants lost more than 1 kg over 6 weeks of Gao Shan Oolong consumption. The same trial reported statistically significant reductions in plasma triglycerides and total cholesterol in hyperlipidemic subjects, and significantly reduced dental plaque indices compared to baseline. Evidence quality is limited by the lack of a placebo control group, randomization, and blinding, making causal conclusions preliminary. Larger randomized controlled trials are needed before firm efficacy claims can be supported.

## Nutritional Profile

Gao Shan Oolong (High Mountain Oolong) is a semi-oxidized tea (30–70% oxidation) grown at elevations typically above 1,000m in Taiwan, with the elevated altitude and cooler temperatures producing a distinctive phytochemical profile. As a brewed beverage consumed without adding solids, macronutrient content per 240ml serving is negligible: <2 kcal, ~0.2g carbohydrates, <0.1g protein, 0g fat, 0g fiber. Key bioactive compounds include: Catechins (partially oxidized due to semi-fermentation) — total catechins approximately 50–150mg/240ml, lower than green tea (~200–300mg) due to oxidation; EGCG (epigallocatechin gallate) approximately 20–80mg/240ml; theaflavins and thearubigins present at low-to-moderate levels (characteristic of partial oxidation); Caffeine: approximately 30–50mg per 240ml serving (moderate, between green and black tea); L-theanine: approximately 15–40mg per 240ml, with high-altitude cultivation associated with higher L-theanine concentrations due to reduced UV-induced catechin conversion; the caffeine:L-theanine ratio (~2:1) supports documented synergistic [cognitive](/ingredients/condition/cognitive) effects. Polyphenols: total polyphenol content approximately 150–300mg gallic acid equivalents per 240ml. Minerals per 240ml brewed serving: fluoride 0.2–0.5mg (relevant to dental health data), manganese 0.4–0.7mg (~20–35% of adequate intake), potassium 30–50mg, magnesium 3–5mg, trace zinc and selenium. Vitamins: minimal — trace vitamin C (<1mg, largely degraded by hot water), small amounts of B vitamins (niacin ~0.1mg). Unique high-altitude compounds: higher concentrations of aromatic compounds including nerolidol, linalool, and geraniol (terpene alcohols contributing to floral notes); elevated chlorogenic acids and flavonols (quercetin glycosides ~5–15mg/240ml, kaempferol glycosides ~3–8mg/240ml) compared to lower-altitude oolongs. Bioavailability notes: catechin absorption is approximately 5–20% of ingested dose; co-consumption with milk proteins may reduce polyphenol bioavailability by 10–30%; L-theanine bioavailability is high (~95%) with peak plasma levels at 30–60 minutes post-ingestion; fluoride bioavailability from tea is approximately 70–90%. The semi-oxidized state preserves more catechins than black tea while producing unique oolong-specific polymeric polyphenols not fully characterized.

## Dosage & Preparation

Clinically studied dosage: 8g dry oolong tea leaves daily (approximately 3 cups brewed tea) for 6 weeks showed weight and lipid benefits. For dental health, 0.2% oolong tea extract solution was used as a mouthrinse. No standardized extracts or powder forms have been clinically tested. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Gao Shan Oolong contains caffeine (approximately 30–50 mg per 8 oz serving), which may cause [insomnia](/ingredients/condition/sleep), tachycardia, or anxiety in sensitive individuals, particularly at high consumption levels. EGCG at supplemental doses (above 800 mg/day) has been associated with hepatotoxicity in rare cases, though typical beverage consumption carries a low risk. Individuals taking anticoagulants such as warfarin should exercise caution, as vitamin K present in tea leaves may interfere with INR levels. Pregnant and breastfeeding women should limit intake to moderate amounts due to caffeine content and insufficient safety data on high-dose polyphenol exposure during pregnancy.

## Scientific Research

Human clinical evidence for Gao Shan Oolong specifically is absent; data derives from general oolong tea studies including an uncontrolled trial (n=102) showing weight loss and lipid improvements (PMID:19271168), and a double-blind crossover study (n=35) demonstrating anti-plaque effects (PMID:8033186). Most mechanistic data comes from animal models showing anti-obesity and [anti-inflammatory](/ingredients/condition/inflammation) effects in high-fat diet mice.

## Historical & Cultural Context

Oolong tea has been used in Traditional Chinese Medicine for centuries to aid weight control and improve lipid [metabolism](/ingredients/condition/weight-management), with roots in Ming Dynasty processing traditions from Fujian, China. Taiwanese Gao Shan cultivars emerged in the 20th century, building on these traditional oolong processing methods while adapting to high-altitude growing conditions.

## Synergistic Combinations

Green tea extract, L-theanine, Garcinia cambogia, Chromium picolinate, [Probiotic](/ingredients/condition/gut-health)s

## Frequently Asked Questions

### How does Gao Shan Oolong differ from regular oolong tea?

Gao Shan Oolong is grown above 1,000 meters elevation in Taiwan, which slows leaf growth and concentrates polyphenols, amino acids like L-theanine, and aromatic terpenes compared to lower-altitude oolongs. This higher polyphenol density, particularly elevated EGCG and theaflavin content, is associated with stronger lipase-inhibiting and thermogenic effects than standard oolong cultivars.

### How much Gao Shan Oolong tea should I drink for weight management?

The uncontrolled trial showing weight loss outcomes used consistent daily consumption equivalent to approximately 3–4 cups (750–1,000 mL) of brewed Gao Shan Oolong per day over 6 weeks. No standardized supplemental dosage has been established in controlled trials, so current guidance is extrapolated from general oolong and green tea research suggesting 300–600 mg of total catechins daily.

### Does Gao Shan Oolong lower cholesterol?

Preliminary evidence from one uncontrolled trial (n=102) in hyperlipidemic subjects found significant reductions in plasma triglycerides and total cholesterol after 6 weeks of daily consumption. The proposed mechanism involves theaflavin inhibition of pancreatic lipase and EGCG-mediated AMPK activation suppressing hepatic lipogenesis, though these findings require confirmation in randomized controlled trials.

### Is Gao Shan Oolong tea safe to drink every day?

For most healthy adults, daily consumption of 3–4 cups is considered safe and consistent with traditional use. However, individuals sensitive to caffeine, those on warfarin therapy, or those with liver conditions should moderate intake, as high polyphenol doses above 800 mg EGCG equivalent per day have been linked to rare cases of hepatotoxicity in supplemental contexts.

### Does Gao Shan Oolong improve dental health?

The same 6-week uncontrolled trial (n=102) reported significantly reduced dental plaque indices among participants consuming Gao Shan Oolong daily. Tea catechins, particularly EGCG, are known to inhibit glucosyltransferase enzymes in Streptococcus mutans, reducing bacterial adhesion and biofilm formation on tooth surfaces, which is the likely mechanism behind the observed plaque reduction.

### Is Gao Shan Oolong safe during pregnancy and breastfeeding?

Gao Shan Oolong contains caffeine (approximately 30-50mg per 8oz cup), which pregnant and breastfeeding women should consume cautiously, with most experts recommending limiting intake to under 200mg daily during pregnancy. While the polyphenols in Gao Shan Oolong are generally recognized as safe, pregnant women should consult their healthcare provider before regular consumption to assess individual risk factors. Breastfeeding mothers should also limit intake as caffeine passes into breast milk.

### Does Gao Shan Oolong interact with blood pressure or cholesterol medications?

Gao Shan Oolong may have additive effects with blood pressure-lowering medications due to its cardiovascular benefits, potentially increasing hypotensive effects. Because it can reduce triglycerides and cholesterol, concurrent use with statin or other lipid-lowering drugs warrants medical supervision to monitor for over-correction. Individuals taking anticoagulants should also consult their healthcare provider, as high-dose tea polyphenols may have mild anticoagulant properties.

### What is the evidence quality for Gao Shan Oolong's health benefits?

Clinical evidence for Gao Shan Oolong is moderate to preliminary, with the strongest data from a single uncontrolled trial (n=102) showing 64-70% of overweight subjects lost over 1kg in 6 weeks for weight management. Dental health benefits are supported by moderate evidence from a double-blind crossover trial (n=35) demonstrating significantly reduced plaque deposition. Most cardiovascular claims remain preliminary and would benefit from larger, controlled randomized trials to establish clinical significance and reproducibility.

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