# Lapsang Souchong Black Tea (Camellia sinensis 'Lapsang Souchong')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/lapsang-souchong-black-tea
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Tea Cultivars
**Also Known As:** Smoky Black Tea, Pine-Smoked Tea, Zhengshan Xiaozhong, Russian Caravan Tea, Tarry Souchong, Smoked Souchong, Wuyi Smoked Tea, Lapsang, Souchong Tea

## Overview

Lapsang Souchong is a pine-smoked Chinese black tea (Camellia sinensis) notable for its high manganese content (4.705 mg/L) and polyphenolic theaflavins, which contribute to both imaging contrast properties and potential vascular effects. Its unique smoke-drying process introduces additional phenolic compounds while concentrating trace minerals that interact with MRI signal pathways.

## Health Benefits

• MRI contrast enhancement: 9g dose significantly suppressed T2 signals in gastrointestinal fluids due to manganese (4.705 mg/L) and iron (0.040 mg/L) content (PMID: 40248936) - preliminary evidence • Potential vascular benefits: General black tea studies show improved [endothelial function](/ingredients/condition/heart-health), though not specifically tested for Lapsang Souchong (PMID: 40008375, PMID: 15649652) - moderate evidence for black tea category • [Antioxidant activity](/ingredients/condition/antioxidant): Contains black tea polyphenols including catechins and theaflavins with established antioxidant properties - traditional evidence only for this specific variant • Grade-dependent volatile compounds: Higher grades contain upregulated beneficial compounds including alcohols, phenols, and terpenes - preliminary analytical evidence only • Potential lower PAH exposure in higher grades: Premium grades show fewer smoking-related phenolic substances - preliminary safety consideration

## Mechanism of Action

Manganese ions (Mn²⁺) at 4.705 mg/L act as paramagnetic contrast agents that shorten T2 relaxation times in gastrointestinal fluids, suppressing MRI signal intensity and providing negative contrast enhancement. Theaflavins and thearubigins, formed via oxidative polymerization of catechins during fermentation, modulate endothelial nitric oxide synthase (eNOS) activity, supporting vasodilation through increased nitric oxide bioavailability. Iron at 0.040 mg/L may contribute additively to paramagnetic relaxation effects, while polyphenols inhibit xanthine oxidase and scavenge [reactive oxygen species](/ingredients/condition/antioxidant), reducing oxidative stress in vascular endothelium.

## Clinical Summary

A preliminary human study (PMID: 40248936) demonstrated that a 9g dose of Lapsang Souchong tea significantly suppressed T2 MRI signals in gastrointestinal fluids, suggesting utility as an oral contrast agent, though sample size and replication remain limited. Broader black tea research shows improved flow-mediated dilation in randomized controlled trials, but these findings are not specific to Lapsang Souchong's pine-smoked cultivar profile. Evidence for MRI contrast use is early-stage with no standardized clinical protocol established. The distinct mineral and phenolic composition of Lapsang Souchong relative to other black teas warrants cultivar-specific clinical investigation before generalizing benefits.

## Nutritional Profile

Lapsang Souchong is a smoked black tea; nutritional data is based on brewed infusion (per 240mL/8oz serving unless noted). Macronutrients are negligible: calories ~2 kcal, carbohydrates <1g, protein <0.5g, fat ~0g. Minerals confirmed by spectrometric analysis: manganese ~4.705 mg/L (notably high among teas, contributing to MRI contrast effects at 9g dose; PMID: 40248936), iron ~0.040 mg/L (PMID: 40248936), with typical black tea mineral ranges also including potassium ~50–100 mg/240mL, magnesium ~5–10 mg/240mL, calcium ~5–8 mg/240mL, fluoride ~0.1–0.5 mg/240mL. Bioactive compounds: polyphenols (theaflavins ~30–90 mg/240mL, thearubigins ~100–200 mg/240mL — oxidation products formed during black tea processing), catechins residual (~10–30 mg/240mL, reduced from green tea precursors due to full oxidation), caffeine ~40–70 mg/240mL, theobromine ~5–10 mg/240mL, L-theanine ~5–15 mg/240mL (lower than green tea due to oxidation). Smoke-specific compounds unique to Lapsang Souchong: polycyclic aromatic hydrocarbons (PAHs) including benzo[a]pyrene and phenolic smoke compounds (guaiacol, syringol) transferred from pine-smoke drying process — concentrations vary by production method but represent a distinguishing and toxicologically relevant feature not present in other black teas; quantitative data in brewed infusion is limited in published literature. Bioavailability notes: theaflavins and thearubigins have low intestinal bioavailability (~1–5%) but exert local [antioxidant](/ingredients/condition/antioxidant) effects in the GI tract; manganese from tea is moderately bioavailable (~5–10%) and accumulates with high intake; caffeine is highly bioavailable (~99%); catechins are better absorbed in the absence of milk proteins.

## Dosage & Preparation

The only clinically studied dose was 9g of brewed Lapsang Souchong tea used for MRI contrast enhancement, selected from in vitro tests at 3g, 6g, and 9g concentrations. No standardized extracts, powders, or therapeutic dosage ranges have been established through clinical research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Lapsang Souchong contains caffeine (typically 30–60 mg per 8 oz serving), which may cause [insomnia](/ingredients/condition/sleep), tachycardia, or anxiety at high doses and can potentiate stimulant medications or interact with adenosine-based drugs. Its manganese content at supplemental doses (9g dry leaf) may be a concern for individuals with liver disease or cholestatic conditions, where manganese clearance is impaired and neurotoxic accumulation is possible. The pine-smoke drying process introduces polycyclic aromatic hydrocarbons (PAHs), raising theoretical carcinogenicity concerns with very high chronic consumption, though evidence at typical dietary intakes is not conclusive. Pregnant or breastfeeding individuals should limit intake due to caffeine exposure, and those on anticoagulants such as warfarin should exercise caution given vitamin K and polyphenol interactions that may affect coagulation.

## Scientific Research

Only one clinical study (n=51) has specifically examined Lapsang Souchong, using it as an oral contrast agent for MRCP imaging rather than for therapeutic purposes (PMID: 40248936). General black tea studies report vascular benefits, but no randomized controlled trials or meta-analyses have evaluated Lapsang Souchong specifically for health outcomes. The evidence base remains extremely limited for biomedical applications of this specific tea variant.

## Historical & Cultural Context

Lapsang Souchong originates from Chinese tea culture in the Wuyi region, where it has been traditionally valued for its distinctive smoky flavor rather than documented medicinal applications. No specific traditional biomedical uses or TCM contexts were identified in the research, with historical focus primarily on sensory qualities and grading standards.

## Synergistic Combinations

Green tea extract, L-theanine, Rhodiola rosea, Ginkgo biloba, Vitamin C

## Frequently Asked Questions

### Can Lapsang Souchong tea be used as an MRI contrast agent?

A clinical study (PMID: 40248936) found that a 9g oral dose of Lapsang Souchong significantly suppressed T2 MRI signals in gastrointestinal fluids, attributed to its manganese content of 4.705 mg/L acting as a paramagnetic agent. This is preliminary evidence and no standardized clinical protocol currently exists for its use as a diagnostic contrast agent in medical settings.

### How much manganese does Lapsang Souchong tea contain?

Lapsang Souchong brewed tea contains approximately 4.705 mg/L of manganese and 0.040 mg/L of iron, based on data from the MRI contrast study (PMID: 40248936). At a 9g dry leaf dose, the paramagnetic mineral load is sufficient to measurably alter T2 relaxation times in gastrointestinal imaging.

### Is Lapsang Souchong safe to drink every day?

For most healthy adults, moderate daily consumption (1–3 cups) is generally considered safe, but the pine-smoke processing introduces polycyclic aromatic hydrocarbons (PAHs) that raise theoretical carcinogenicity concerns with very high chronic intake. Its caffeine content (30–60 mg per cup) also warrants caution for those sensitive to stimulants, and individuals with liver or cholestatic conditions should be mindful of elevated manganese exposure.

### What makes Lapsang Souchong different from other black teas?

Lapsang Souchong is uniquely processed by smoke-drying the Camellia sinensis leaves over pinewood fires, which imparts a distinctive smoky flavor and introduces additional phenolic compounds not found in conventionally dried black teas. This process also concentrates trace minerals like manganese, giving it a distinct mineral profile and MRI contrast properties that set it apart from standard black tea cultivars.

### Does Lapsang Souchong tea support heart health?

General black tea research demonstrates that theaflavins and thearubigins can improve endothelial function by upregulating eNOS activity and increasing nitric oxide bioavailability, supporting vasodilation and cardiovascular health. However, these findings come from general black tea studies and have not been replicated in trials specifically using Lapsang Souchong, so cultivar-specific cardiovascular evidence remains limited.

### Is Lapsang Souchong safe to consume before medical imaging procedures like MRI?

Lapsang Souchong contains notable levels of manganese and iron that can suppress MRI T2 signals in gastrointestinal fluids at typical serving sizes (9g), potentially interfering with imaging quality. If you are scheduled for MRI imaging, consult your healthcare provider about timing consumption of this tea, as it may need to be avoided 24–48 hours before the procedure. This consideration is particularly relevant for abdominal or gastrointestinal MRI scans where signal suppression could obscure diagnostic findings.

### Does Lapsang Souchong interact with iron supplements or iron-rich medication regimens?

Lapsang Souchong contains measurable iron (0.040 mg/L) and significant manganese (4.705 mg/L), which may have minor interactions with iron supplementation or medications that depend on mineral absorption. While the iron content per serving is modest, regular concurrent consumption with iron supplements or chelating medications warrants discussion with your healthcare provider to ensure optimal absorption and safety. Spacing consumption by 2–4 hours from iron supplements is a reasonable precautionary approach.

### How does the mineral content of Lapsang Souchong compare to other black tea cultivars?

Lapsang Souchong is notably higher in manganese (4.705 mg/L) and contains measurable iron (0.040 mg/L), mineral levels that distinguish it from standard black tea cultivars and contribute to its observed MRI contrast properties. The distinctive smoking process used in Lapsang Souchong production may concentrate minerals differently than other black tea processing methods, though direct comparative analysis with other cultivars remains limited in the literature. These mineral concentrations make it particularly relevant for those monitoring manganese intake or preparing for medical imaging procedures.

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