What Is (R)-5-hydroxy-2-decenoic acid lactone

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Last updated: April 10, 2026

Quick Answer: 10-Hydroxy-2-decenoic acid (10-HDA), also called Queen bee acid, is a unique unsaturated fatty acid found exclusively in royal jelly with the molecular formula C10H18O3. This medium-chain carboxylic acid comprises 1.4-2.4% of royal jelly's total composition and has been shown to possess antimicrobial, antioxidant, anti-inflammatory, and immunomodulatory properties that extend lifespan and support cellular health. It is the only known natural source of this compound, making it biologically significant since its discovery in 1957.

Key Facts

10-HDA comprises 1.4-2.4% of royal jelly composition and is the only natural source of this fatty acid
Chemical formula is C10H18O3 with an α,β-unsaturated medium-chain structure and terminal hydroxyl group
Identified and characterized in 1957 in the journal Science as a previously unknown antibiotic compound
Extends lifespan in Caenorhabditis elegans model organisms through dietary restriction and mTOR signaling pathways
Demonstrates potent antimicrobial, anti-tumor, anti-inflammatory, neurogenic, and immunomodulatory biological activities

Overview

10-Hydroxy-2-decenoic acid (10-HDA), commonly known as Queen bee acid, is a distinctive unsaturated medium-chain fatty acid with the molecular formula C10H18O3. This compound is produced exclusively by honeybees as a secretion from their hypopharyngeal and mandibular glands, making it the primary active component of royal jelly. The structure of 10-HDA consists of a ten-carbon saturated chain with a carboxylic acid group at one terminus and a hydroxyl (-OH) group at the tenth carbon position, connected by a double bond between carbons 2 and 3, making it an α,β-unsaturated fatty acid.

Royal jelly, the nutrient-rich secretion fed to all honeybee larvae and exclusively to adult queen bees throughout their lives, contains 10-HDA at concentrations ranging from 1.4 to 2.4 percent by weight. 10-HDA is the defining characteristic of royal jelly composition, distinguishing it chemically from all other bee products and natural sources worldwide. The discovery of 10-HDA in 1957 represented a major advancement in apicultural biochemistry, as this compound had never been found in any other natural material, making royal jelly the singular natural source of this bioactive molecule. Since its initial characterization, 10-HDA has become the subject of extensive scientific investigation into its diverse biological activities and therapeutic potential.

How It Works

10-HDA exerts its biological effects through multiple cellular and molecular mechanisms:

Antimicrobial Action: 10-HDA disrupts bacterial cell membranes and inhibits the growth of pathogenic microorganisms, making it an effective natural antimicrobial agent that helps preserve royal jelly and protects developing bees from infection.
Antioxidant Protection: The compound scavenges free radicals and reactive oxygen species (ROS) in cells, reducing oxidative stress and protecting cellular components from damage caused by normal metabolic processes and environmental exposure.
Immune System Modulation: 10-HDA activates and regulates innate immune responses through multiple pathways, including toll-like receptor signaling and cytokine production, enhancing the body's natural defense mechanisms against pathogens.
Mitochondrial Function Enhancement: Research demonstrates that 10-HDA improves mitochondrial respiratory chain efficiency and optimizes energy production at the cellular level, supporting overall metabolic health and longevity pathways.
Cell Signaling Pathways: 10-HDA activates PPARα (peroxisome proliferator-activated receptor alpha) signaling and modulates mTOR (mechanistic target of rapamycin) pathways, which regulate cell growth, autophagy, and lifespan extension mechanisms similar to dietary restriction.

Key Comparisons

Characteristic	10-Hydroxy-2-decenoic Acid	Trans-2-Decenoic Acid	Other Fatty Acids
Natural Source	Royal jelly only (1.4-2.4%)	Precursor in various sources	Wide distribution in nature
Molecular Formula	C10H18O3	C10H18O2	Varies by compound
Biological Activity	Antimicrobial, antioxidant, immunomodulatory, anti-aging	Limited known bioactivity	Variable by type
Hydroxyl Group Position	Terminal (position 10)	None (carboxylic acid only)	Position varies
Stability	Relatively stable in royal jelly matrix	Oxidizes to form 10-HDA	Variable stability

Why It Matters

Longevity Research: Studies in Caenorhabditis elegans demonstrate that 10-HDA extends lifespan through mTOR signaling and dietary restriction mimicry, providing insights into aging mechanisms applicable to human health optimization.
Cosmetic and Skin Health Applications: 10-HDA promotes filaggrin production and amino acid synthesis in human epidermis models, supporting skin barrier function, hydration, and cornified envelope formation for improved dermatological health.
Anti-tumor Potential: Research indicates 10-HDA possesses anti-tumor and VEGF-inhibiting properties, making it a candidate compound for cancer research and preventive health applications.
Neurological Support: 10-HDA promotes neurogenesis of neural stem and progenitor cells in vitro, suggesting potential applications in neurological health, brain development, and neurodegenerative disease prevention.
Inflammatory Response Regulation: The compound modulates inflammatory pathways and reduces pro-inflammatory cytokine production, offering therapeutic potential for inflammatory and autoimmune conditions.

The significance of 10-hydroxy-2-decenoic acid extends beyond its chemical novelty to its practical applications in pharmaceuticals, cosmeceuticals, nutritional supplements, and functional foods. As the defining bioactive compound of royal jelly, 10-HDA represents a bridge between traditional apicultural knowledge and modern biochemical science, validating the historical use of royal jelly in traditional medicine while opening new avenues for therapeutic development. The exclusivity of 10-HDA to royal jelly makes this bee product scientifically unique, and ongoing research continues to uncover new mechanisms of action and therapeutic applications for this remarkable natural compound.