Albizia, often called the “happiness tree” or silk tree, is a plant used primarily to ease anxiety, improve mood, and promote sleep. In Traditional Chinese Medicine, both the bark and flowers of Albizia julibrissin have been prescribed for thousands of years to calm the mind and relieve emotional distress. Today, it appears most commonly in herbal supplements marketed for stress relief and sleep support.
A Long History as a Mood Remedy
Albizia holds a notable place in Traditional Chinese Medicine, where it’s known as “He Huan” (meaning “collective happiness”). The bark, called He Huan Pi, and the flowers have been used for centuries to treat anxiety, melancholy, insomnia, and forgetfulness. Classical texts describe the plant as one that soothes the internal organs, harmonizes the mind, and “makes people happy and worry-free.”
Beyond emotional uses, practitioners also applied albizia bark to physical conditions: bruises, fractures, swelling, and wound healing. The flowers had a slightly different emphasis, traditionally prescribed for feelings of unease, chest tightness, insomnia, and poor memory. This distinction between bark and flower still shows up in modern herbal formulas, where each part of the plant may be used for overlapping but not identical purposes.
How Albizia Affects the Brain
Animal research offers some clues about why albizia has been valued as a mood remedy for so long. In mouse studies, an extract of albizia bark reduced behaviors associated with depression in a dose-dependent way, meaning higher doses produced stronger effects. When researchers blocked a specific type of serotonin receptor (the 5-HT1A receptor), the antidepressant effect disappeared. Blocking other serotonin receptor types had no effect. This suggests albizia’s mood benefits work through the same serotonin pathway targeted by some conventional antidepressants.
It’s worth noting that these findings come from animal models, not human clinical trials. The serotonin connection is promising and helps explain the traditional use, but it doesn’t yet confirm that the same mechanism plays out identically in people.
Sleep and Sedative Effects
The flowers of albizia have been used as a sedative in East Asian medicine for generations, prescribed for insomnia and restlessness. Researchers isolated two specific plant compounds from the flowers, quercitrin and isoquercitrin, both belonging to a class of molecules called flavonol glycosides. In mice, both compounds extended sleep duration in a dose-dependent manner, with quercitrin showing stronger effects than isoquercitrin. Neither compound caused lethal effects or noticeable behavioral changes at the doses tested.
These findings support the traditional use of albizia flowers as a gentle sleep aid, though human sleep studies with measured outcomes like time to fall asleep or total sleep duration have not been published.
Anti-Inflammatory Properties
More recent research has explored albizia’s potential for reducing inflammation, particularly in skin conditions. In an animal model of atopic dermatitis (a type of eczema), an albizia extract reduced several key markers of inflammation in skin cells. It lowered levels of multiple inflammatory signaling molecules that drive redness, swelling, and immune cell recruitment. The extract also decreased the number of immune cells accumulating in affected skin, including eosinophils and mast cells, both of which play central roles in allergic skin reactions.
Higher doses of the extract produced stronger effects and reduced activity in a specific inflammatory signaling pathway involved in chronic skin inflammation. While these results are from lab and animal models rather than human trials, they align with the traditional use of albizia bark for swelling and sores.
Forms and Dosing
Albizia supplements are sold as bark powder, bark extract capsules, tinctures, and dried flowers for tea. Some products combine albizia with other calming herbs like passionflower or ashwagandha. In newer formulations, albizia flower essential oil has been combined with other plant oils for use in aromatherapy preparations targeting anxiety and low mood.
There is currently no standardized dosage backed by clinical research. Traditional preparations typically involved decoctions (simmered teas) of the bark or flowers, but modern capsules and extracts vary widely in concentration. If you’re choosing a supplement, look for products that specify the plant part used (bark or flower) and the extraction ratio, since these affect potency.
Which Species Matters
The genus Albizia includes many species, and not all are used interchangeably. Albizia julibrissin is the species with the longest and most documented history in Traditional Chinese Medicine, valued primarily for sleep, mood, and inflammation. Albizia lebbeck, sometimes called “woman’s tongue tree,” appears in other traditional medicine systems, particularly in South Asia, with somewhat different applications. When purchasing supplements, confirm that the product contains Albizia julibrissin specifically, as this is the species behind most of the available research.
Safety and Drug Interactions
Published research on albizia’s side effects is limited, which cuts both ways: no major adverse reactions have been documented, but the absence of data doesn’t guarantee safety. No reliable information exists on the safety of albizia during pregnancy or breastfeeding.
Because albizia appears to influence serotonin activity, caution is warranted if you’re taking antidepressant medications, particularly SSRIs or other drugs that affect serotonin levels. Combining serotonin-active substances can, in theory, increase the risk of excessive serotonin activity. Similarly, because of its sedative properties, taking albizia alongside sleep medications or anti-anxiety drugs could amplify drowsiness. Information on specific drug-herb interactions remains sparse, so transparency with your healthcare provider about supplement use is practical, not optional.