# Sri Lankan Black Turmeric (Curcuma caesia 'Sri Lankan')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/sri-lankan-black-turmeric
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Curcuma caesia, Black Turmeric, Kali Haldi, Black Zedoary, Purple Turmeric, Curcuma caesia 'Sri Lankan', Sri Lankan Curcuma caesia, Ceylon Black Turmeric, Dark Turmeric, Curcuma caesia roxb

## Overview

Sri Lankan Black Turmeric (Curcuma caesia 'Sri Lankan') is a rare turmeric variant whose chloroform extracts contain exceptionally high total phenolic content (56.64–109.41 mg GAE/g) and essential oils rich in ar-turmerone (12.3%) and ar-curcumene (6.8%). These bioactive compounds drive its antioxidant activity via [free radical scaveng](/ingredients/condition/antioxidant)ing and may modulate [inflammatory pathway](/ingredients/condition/inflammation)s through terpenoid-mediated enzyme inhibition.

## Health Benefits

• Antioxidant support: Chloroform extracts demonstrated high total phenolic content (56.64-109.41 mg GAE/g extract) with effective [free radical scaveng](/ingredients/condition/antioxidant)ing in DPPH assays (Evidence: In-vitro studies only)
• [Anti-inflammatory](/ingredients/condition/inflammation) potential: Essential oils contain ar-turmerone (12.3%) and ar-curcumene (6.8-14.8%) which contribute to anti-inflammatory properties (Evidence: Phytochemical analysis, no clinical trials)
• [Antimicrobial](/ingredients/condition/immune-support) activity: Essential oil compounds including camphor (15.2-28.3%) and 1,8-cineole (27.0-30.1%) show antibacterial and antifungal properties (Evidence: In-vitro studies)
• Respiratory support: Traditional use for anti-asthmatic effects and smooth [muscle relaxation](/ingredients/condition/sleep) (Evidence: Traditional use only, no clinical validation)
• Polyphenolic benefits: Contains curcuminoids that function as electron-donating and reducing agents in antioxidant pathways (Evidence: Chemical characterization studies)

## Mechanism of Action

The chloroform-soluble phenolic compounds in Curcuma caesia 'Sri Lankan' donate hydrogen atoms to neutralize free radicals, as measured by DPPH assay IC50 values, reducing [oxidative stress](/ingredients/condition/antioxidant) at the cellular level. Ar-turmerone (12.3% of essential oil) inhibits arachidonic acid [metabolism](/ingredients/condition/weight-management) by suppressing cyclooxygenase (COX) enzyme activity, potentially reducing prostaglandin synthesis. Ar-curcumene (6.8% of essential oil) may further modulate NF-κB signaling, a master regulator of [pro-inflammatory cytokine](/ingredients/condition/inflammation) transcription, though direct receptor-binding data for this specific cultivar remain limited.

## Clinical Summary

Current evidence for Sri Lankan Black Turmeric is restricted entirely to in-vitro laboratory studies; no human clinical trials or animal pharmacokinetic studies specific to the 'Sri Lankan' cultivar have been published. Chloroform extracts demonstrated total phenolic content ranging from 56.64 to 109.41 mg gallic acid equivalents per gram of extract, placing it among the higher-phenolic turmeric variants tested under equivalent conditions. DPPH radical scavenging assays confirmed [antioxidant activity](/ingredients/condition/antioxidant), though effective concentrations and dose-response curves have not been translated into human-relevant bioavailability data. Consumers should treat all purported health benefits as preliminary and hypothesis-generating until controlled human trials are conducted.

## Nutritional Profile

Sri Lankan Black Turmeric (Curcuma caesia 'Sri Lankan') is a rhizomatous spice with a distinct phytochemical profile that differs notably from common turmeric (C. longa). Macronutrient data specific to this cultivar is limited, but rhizome-based turmeric species typically contain approximately 60-70% carbohydrates, 6-8% protein, and 5-10% fat on a dry weight basis, with dietary fiber contributing 2-7% of fresh weight. Moisture content in fresh rhizomes is approximately 80-85%.

Key bioactive compounds: Curcuminoids are present but at lower concentrations than C. longa, with curcumin content estimated at 0.5-2.0% dry weight in C. caesia variants; the Sri Lankan cultivar's exact curcuminoid profile requires further quantification. Essential oil content is notably high (2.0-4.5% of dry rhizome weight), with the primary volatile constituents identified as camphor (a dominant component in many C. caesia accessions, 20-40%), ar-turmerone (12.3%), ar-curcumene (6.8-14.8%), and eucalyptol/1,8-cineole (variable, ~5-10%). Total phenolic content in chloroform extracts has been quantified at 56.64-109.41 mg GAE/g extract, indicating a rich polyphenolic matrix beyond curcuminoids alone.

Micronutrients: As with related Curcuma species, rhizomes likely provide moderate potassium (~2000 mg/100g dry weight), manganese (~10-20 mg/100g dry weight), and iron (~40-50 mg/100g dry weight), though Sri Lankan cultivar-specific mineral analysis is not yet published. Magnesium, phosphorus, and zinc are present in trace-to-moderate amounts consistent with the genus.

Bioavailability notes: Curcuminoids in this species, as with C. longa, have inherently low oral bioavailability (<1% absorption without enhancers) due to poor water solubility, rapid [metabolism](/ingredients/condition/weight-management), and systemic elimination. Co-administration with piperine or lipid-based carriers is expected to enhance absorption similarly to other Curcuma species. The essential oil components (camphor, ar-turmerone) are lipophilic and absorbed readily through gastrointestinal membranes, though rapid hepatic metabolism limits systemic exposure. Phenolic compounds in the chloroform-extractable fraction suggest the presence of lipophilic [antioxidant](/ingredients/condition/antioxidant)s with moderate bioavailability. No cultivar-specific human pharmacokinetic data is currently available.

## Dosage & Preparation

No clinically studied dosage ranges are available for Curcuma caesia in human subjects. While various extract fractions have been characterized for their chemical composition and in vitro activity, specific dosing protocols or standardization levels have not been established through clinical research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

No formal safety studies, toxicology reports, or adverse event data specific to Curcuma caesia 'Sri Lankan' have been published in peer-reviewed literature, making it impossible to establish a confirmed safe dosage range. As with other Curcuma species, theoretical concerns include potentiation of anticoagulant medications (warfarin, aspirin) due to platelet aggregation inhibition by curcuminoid-related compounds. Individuals with gallbladder disease or bile duct obstruction should exercise caution, as curcuminoids generally stimulate bile production. Pregnant or breastfeeding women should avoid supplementation given the absence of reproductive safety data for this specific cultivar.

## Scientific Research

The available research consists primarily of phytochemical characterization studies and in vitro research demonstrating [antioxidant](/ingredients/condition/antioxidant), [antimicrobial](/ingredients/condition/immune-support), and [anti-inflammatory](/ingredients/condition/inflammation) properties. No human clinical trials, randomized controlled trials (RCTs), or meta-analyses with PubMed identifiers were found in the provided literature for Curcuma caesia.

## Historical & Cultural Context

Curcuma caesia has been used in traditional medicine systems, particularly in India, for smooth [muscle relaxation](/ingredients/condition/sleep), antifungal treatment, anti-asthmatic effects, and [antioxidant](/ingredients/condition/antioxidant) purposes. The aromatic rhizomes and leaves have been employed in traditional practice due to their essential oil content, though specific historical duration and detailed traditional medical system context require further documentation.

## Synergistic Combinations

Regular turmeric, black pepper (piperine), ginger, boswellia, quercetin

## Frequently Asked Questions

### What makes Sri Lankan Black Turmeric different from regular turmeric?

Sri Lankan Black Turmeric (Curcuma caesia 'Sri Lankan') is distinguished by its dark-pigmented rhizome and a unique essential oil profile dominated by ar-turmerone (12.3%) and ar-curcumene (6.8%), compounds found in lower concentrations in common Curcuma longa. Its chloroform extracts also show total phenolic content up to 109.41 mg GAE/g, which tends to exceed standard turmeric preparations tested under the same methodology. These chemical differences suggest a distinct bioactivity profile, though direct comparative clinical studies do not yet exist.

### What is ar-turmerone and why does it matter in Sri Lankan Black Turmeric?

Ar-turmerone is a sesquiterpene ketone comprising approximately 12.3% of the essential oil in Sri Lankan Black Turmeric and is considered one of its primary bioactive compounds. Research on ar-turmerone across Curcuma species indicates it may inhibit COX enzymes involved in prostaglandin synthesis and has shown neural stem cell stimulation activity in separate Curcuma longa studies. Its relatively high concentration in this cultivar positions it as a key driver of the anti-inflammatory and antioxidant properties observed in early in-vitro testing.

### Is Sri Lankan Black Turmeric safe to take as a supplement?

There are currently no published human safety studies, clinical dose-escalation trials, or formal toxicology reports specific to the Curcuma caesia 'Sri Lankan' cultivar. Based on the broader Curcuma genus, potential concerns include gastrointestinal discomfort at high doses, increased bleeding risk when combined with anticoagulants like warfarin or NSAIDs, and possible gallbladder stimulation. Until dedicated safety data are available, individuals with chronic conditions or those taking prescription medications should consult a healthcare provider before use.

### How was the antioxidant activity of Sri Lankan Black Turmeric measured?

Antioxidant activity was evaluated using the DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assay, a standard in-vitro colorimetric method that measures how effectively an extract neutralizes synthetic radicals. Chloroform extracts of the Sri Lankan cultivar showed total phenolic content between 56.64 and 109.41 mg gallic acid equivalents per gram of extract, with scavenging efficiency correlating with phenolic concentration. It is important to note that DPPH results do not directly predict antioxidant effects in the human body due to differences in bioavailability, metabolism, and cellular environment.

### Can Sri Lankan Black Turmeric be used during pregnancy?

Sri Lankan Black Turmeric should be avoided during pregnancy due to a complete absence of reproductive toxicology or gestational safety data for this specific cultivar. Curcuma caesia in traditional medicine has occasionally been associated with uterotonic properties in related species, raising theoretical concerns about stimulating uterine contractions. Without controlled safety studies, the precautionary principle applies, and pregnant or breastfeeding individuals should refrain from supplementation and consult their obstetrician before using any Curcuma caesia product.

### What is the difference between Sri Lankan Black Turmeric and Indian Black Turmeric varieties?

Sri Lankan Black Turmeric (Curcuma caesia 'Sri Lankan') is a specific cultivar variant known for higher ar-turmerone content (12.3%) compared to other black turmeric strains, which contributes to its distinctive anti-inflammatory profile. The Sri Lankan variety demonstrates particularly high total phenolic content (56.64-109.41 mg GAE/g extract) in chloroform extracts, suggesting regional cultivation and processing differences may enhance phytochemical concentration. This cultivar specificity makes it distinct from black turmeric grown in India or other regions with potentially different chemical compositions.

### How much Sri Lankan Black Turmeric should I take daily as a supplement?

While Sri Lankan Black Turmeric shows promising antioxidant and anti-inflammatory activity in laboratory studies, clinical dosage recommendations have not been established through human trials. The available research is based on in-vitro studies and phytochemical analysis rather than clinical dosing protocols, making it difficult to recommend a specific daily amount. Consult with a healthcare provider for personalized dosing guidance, as they can assess your individual health needs and potential interactions with other supplements or medications.

### What does the clinical research evidence show for Sri Lankan Black Turmeric's effectiveness?

Current evidence for Sri Lankan Black Turmeric is primarily limited to in-vitro laboratory studies demonstrating high antioxidant activity through DPPH free radical scavenging assays and phytochemical analysis showing ar-turmerone (12.3%) and ar-curcumene (6.8-14.8%) content. No human clinical trials have been published that directly measure health outcomes from Sri Lankan Black Turmeric supplementation, meaning benefits are theoretically supported but not yet proven in people. Further clinical research is needed before making definitive claims about its efficacy for specific health conditions.

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