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Tetrahydrocurcumin
Natural API

Tetrahydrocurcumin

Tetrahydrocurcumin (CAS: 36062-04-1) is the primary metabolite of curcumin and a reduced form of the active component found in turmeric (Curcuma longa). With ​superior antioxidant, anti-inflammatory, and neuroprotective​ activity compared to curcumin, it was designated as GRAS (Generally Recognized as Safe) by the FDA in 2023 and approved as a food antioxidant (E 100(iii)) by the European EFSA. China's National Health Commission included it in the food additive directory (GB 2760-2022) in 2022.

Product Name: Tetrahydrocurcumin

IUPAC Name: (1E,6E)-1,7-Bis(4-hydroxy-3-methoxyphenyl)-4-heptadione

CAS No.​: 36062-04-1

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    Tetrahydrocurcumin

    Basic information

    Product Name: Tetrahydrocurcumin

    IUPAC Name: (1E,6E)-1,7-Bis(4-hydroxy-3-methoxyphenyl)-4-heptadione

    CAS No.​:  36062-04-1

    Molecular Formula: C₂₁H₂₄O₆

    Physicochemical Properties:

    Parameter

    Value/Description

    ​Appearance​

    White to pale yellow powder

    ​Melting Point​

    83–85°C

    ​Solubility​

    0.1 mg/mL in water; >50 mg/mL in DMSO

    ​logP​

    3.2 (moderate lipophilicity)

    ​pKa​

    8.5 (phenolic OH), 10.2 (enolic OH)

    ​Stability​

    Light-sensitive; most stable at pH 6–8

    Quality Standard: CP2020,JP,Customer Made

    Specification

    Test Items

    Standard

    Tetrahydrocurcumin (CAS: 36062-04-1)

    98% by HPLC

    Loss on drying

    ≤0.5%

    Residue on ignition

    ≤0.1%

    Key Features

    index_10-7

    Metabolic Advantage

     80% oral bioavailability (vs. 1% for curcumin).
    index_10-7

    Multi-Target Action

    Simultaneously activates Nrf2 while inhibiting NF-κB and COX-2.
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    High Safety

    NOAEL (No Observed Adverse Effect Level) = 500 mg/kg/day.

    Pharmacological Mechanisms

    1.Molecular Target Network

    Pharmacological Mechanisms

    2.Pharmacokinetics

    Absorption

    80% oral bioavailability (low glucuronidation).

    Distribution

    High in liver and brain (brain/plasma ratio=1.8:1).

    Metabolism

    Hepatic CYP2D6-mediated methylation (active metabolites).

    Excretion

    Primarily biliary (90% clearance in 72h).

    Clinical Applications

    Indications & Protocols​

    Condition​

    ​Regimen​

    ​Evidence

    ​Osteoarthritis​

    200 mg/day ×12 weeks

    ↓35% WOMAC score*

    ​Melasma​

    2% cream bid ×8 weeks

    ↓50% MASI score

    ​Mild Cognitive Impairment​

    100 mg bid (Phase II)

    ↑2 MMSE points

    *Multicenter RCT (n=300)

    Special Populations​

    Hepatic Impairment: Reduce dose 50% (Child-Pugh B).

    Elderly: No dose adjustment (monitor blood pressure).

    Dosage and Administration

    Formulations​
    Softgel Capsules: 100 mg/capsule (MCT oil carrier).
    Topicals: 1–3% serums/creams.
    Injection: 20 mg/mL (dilute in saline).

    Dosing Guidelines

    Use​

    ​Dose​

    ​Duration

    ​Anti-Inflammatory​

    200–400 mg/day

    8–12 weeks

    ​Skin Brightening​

    Topical bid

    ≥8 weeks

    ​Neuroprotection​

    100–200 mg/day

    Long-term

    Safety Evaluation

    Adverse Reactions

    System​

    ​Incidence​

    ​Manifestations

    ​Gastrointestinal​

    2%

    Mild diarrhea

    ​Dermatologic​

    0.5%

    Contact dermatitis

    ​Hepatic​

    <0.1%

    Reversible ALT↑

    Contraindications & Interactions​

    Absolute CI:
    Curcuminoid allergy.
    Complete biliary obstruction.

    Cautions:CYP2D6 substrates (e.g., metoprolol): May ↑30% plasma concentration.

    Research Progress Green max

    Novel Formulations​

    Nanostructured Lipid Carriers: ↑15× transdermal absorption.

    Sustained-Release Microspheres: Single injection maintains efficacy for 7 days.

    New Indications

    Diabetic Nephropathy: Inhibits TGF-β1/Smad3 (↓40% fibrosis in animals).

    Parkinson’s Disease: Protects dopaminergic neurons (↑35% TH+ cells in MPTP models).

    Curcuma longa

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