Atractylenolide

Atractylenolide is a sesquiterpene lactone extracted primarily from Atractylodes macrocephala, a root used extensively in Traditional Chinese Medicine. Its primary bioactive mechanism involves modulation of NF-κB signaling and inhibition of pro-inflammatory cytokines, underpinning its anti-inflammatory and gastroprotective effects.

Origin & History

Atractylenolide is a group of sesquiterpene lactones isolated from the rhizomes of Atractylodes macrocephala, commonly known as white atractylodes or Baizhu in traditional Chinese medicine. These compounds are extracted using methods like ultra-performance liquid chromatography and mass spectrometry.

Historical & Cultural Context

Atractylenolides have been key components in Traditional Chinese Medicine for centuries, used for digestive ailments, edema, and spleen deficiency. The traditional applications highlight its roles in immune and gastrointestinal health, although precise durations are not quantified.

Health Benefits

• Traditionally used to treat digestive issues, though specific human studies are lacking.
• Believed to support immune system health based on historical use.
• Used in traditional medicine for managing edema.
• Suggested to aid in spleen deficiency treatments in TCM.
• Historically linked to gastrointestinal benefits.

How It Works

Atractylenolide I, II, and III inhibit NF-κB activation by suppressing IκB kinase (IKK) phosphorylation, thereby reducing downstream production of TNF-α, IL-6, and IL-1β. Atractylenolide I also activates the Nrf2/HO-1 antioxidant pathway, enhancing cellular resistance to oxidative stress. Additionally, it has been shown to modulate motilin and substance P receptor activity in the gastrointestinal tract, which may explain its prokinetic and antispasmodic effects observed in preclinical models.

Scientific Research

There are no known human clinical trials, randomized controlled trials, or meta-analyses specifically for atractylenolide. The research largely focuses on phytochemical identification and preclinical effects of Atractylodes macrocephala extracts.

Clinical Summary

The majority of evidence supporting atractylenolide comes from in vitro cell studies and rodent models, with limited controlled human trials. Animal studies using doses of approximately 10–40 mg/kg have demonstrated reduced colonic inflammation markers and improved gastric emptying rates in chemotherapy-induced dysmotility models. A small number of TCM combination formula trials involving Atractylodes macrocephala extract suggest improvements in functional dyspepsia symptoms, but isolating atractylenolide's specific contribution is not possible from these designs. Overall, the human clinical evidence base is preliminary, and larger randomized controlled trials are needed to establish efficacy and optimal dosing.

Nutritional Profile

Atractylenolide is a bioactive sesquiterpene lactone compound, not a nutritional ingredient in the conventional sense, and therefore does not contribute macronutrients (proteins, fats, carbohydrates), dietary fiber, vitamins, or minerals. It exists as a pure phytochemical isolate primarily extracted from the rhizome of Atractylodes macrocephala (Baizhu) and related Atractylodes species. Three primary structural isomers are recognized: Atractylenolide I (molecular formula C15H18O2, MW 230.30 g/mol), Atractylenolide II (C15H20O2, MW 232.32 g/mol), and Atractylenolide III (C15H20O3, MW 248.32 g/mol). In the source herb Atractylodes macrocephala, total atractylenolide concentrations typically range from 0.01% to 0.1% dry weight of the rhizome. As a lipophilic sesquiterpene lactone, it demonstrates moderate to good bioavailability through lipid-mediated absorption pathways. It is not water-soluble, limiting absorption from aqueous preparations. Bioavailability is enhanced when consumed with dietary fats or formulated in lipid-based carriers. Detected biological activity occurs at concentrations in the microgram-per-milliliter range in in vitro studies (IC50 values reported between 10–50 µg/mL for various cellular assays). No caloric value is assigned as it is consumed in trace pharmacological quantities rather than nutritional amounts.

Preparation & Dosage

No clinically studied dosage ranges are available for atractylenolide in human trials. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Ginger, licorice root, ginseng, astragalus, reishi mushroom

Safety & Interactions

Atractylenolide as an isolated compound lacks comprehensive human safety data, though Atractylodes macrocephala root preparations have a long history of use with a generally favorable tolerability profile. High doses in animal models have shown mild hepatotoxic signals, suggesting caution at supratherapeutic levels. Due to its NF-κB inhibitory activity, it may theoretically potentiate the effects of immunosuppressant drugs such as corticosteroids or calcineurin inhibitors, warranting caution in transplant patients. Pregnant or breastfeeding individuals should avoid supplementation due to insufficient safety data, and individuals on anticoagulant therapy should consult a physician given preliminary platelet-modulating findings in vitro.