Purslane (Portulaca oleracea L.) is a common edible weed that has long been used as both a wild vegetable and a traditional herb. Recently, it has gained scientific attention for its rich content of beneficial compounds, including omega-3 fatty acids (especially α-linolenic acid), flavonoids, polysaccharides, vitamins, and minerals. Studies have explored its potential roles in heart health, antioxidant defense, immune support, neuroprotection, and skin care. As interest grows, more commercial products featuring purslane extracts are appearing in the functional food and supplement markets. This article briefly reviews purslane’s botanical features, nutritional value, bioactive components, reported activities, and current uses, based on published research and traditional knowledge. It is not intended as medical advice or proof of clinical effectiveness.
Many plants once regarded simply as common weeds are now being re-evaluated for their nutritional value and functional properties. Purslane is one such example. Widely distributed across Asia, Europe, the Mediterranean region, and many other parts of the world, this humble plant has been consumed for centuries as both a vegetable and a medicinal herb. In recent years, advances in phytochemical and nutritional research have further revealed its rich composition of health-promoting compounds, leading to growing interest from researchers and the food, nutraceutical, and cosmetics industries.
The following sections introduce the botanical characteristics, nutritional composition, reported health-related properties, and current commercial applications of purslane based on available scientific literature.
An Exceptional Source of α-Linolenic Acid Among Leafy Vegetables
Purslane (Portulaca oleracea L.), also known by several traditional names in China, has been documented in classical Chinese medical literature, including Variorum of the Classic of Materia Medica (Bencao Jing Jizhu), Kaibao Materia Medica (Kaibao Bencao), and Compendium of Materia Medica (Bencao Gangmu). Its Chinese name originates from the resemblance of its leaves to horse teeth and its smooth texture, which resembles that of amaranth. Throughout history, purslane has gradually become a widely recognized medicinal and edible herb in traditional folk practice.
Botanically, purslane is a glabrous succulent herb with prostrate or ascending stems that spread across the ground. Its leaves are flat, fleshy, and thick. The plant is widely distributed throughout China, where it thrives in fertile soils and is commonly found in farmland, vegetable gardens, and roadsides at elevations below 1,300 meters. Beyond China and other parts of Asia, purslane is also widely distributed throughout the Caribbean, North America, Mexico, and Australia, and has traditionally been consumed in countries including Spain, Greece, Italy, Türkiye, and the United States.
The entire plant has traditionally been used for medicinal purposes in China, where it has been described as possessing properties that help clear heat, eliminate dampness, reduce swelling, relieve inflammation, quench thirst, and promote urination, while its seeds have traditionally been used to support eye health. The tender stems and leaves are edible and have a mildly sour taste. Despite its modest appearance, purslane contains an impressive array of nutrients, particularly its high concentration of α-linolenic acid (ALA). Studies have reported that 100 g of fresh purslane leaves contain approximately 300–400 mg of α-linolenic acid, representing the highest reported ALA content among commonly consumed leafy vegetables.
Reported Health Benefits of Purslane
Purslane contains a wide variety of bioactive constituents, including omega-3 fatty acids (such as α-linolenic acid, γ-linolenic acid, linoleic acid, and eicosapentaenoic acid), polysaccharides (purslane polysaccharides are composed of multiple monosaccharide units including arabinose, galactose, glucose, mannose, rhamnose, and xylose), flavonoids (including kaempferol, apigenin, luteolin, myricetin, and related compounds), as well as vitamins and other phytochemicals. According to published studies, these bioactive components have been associated with antibacterial activity, blood glucose regulation, immune support, antioxidant activity, and neurological health.
1. Potential Benefits for Cardiovascular Health
Studies have reported that the omega-3 fatty acid content of purslane is approximately five times higher than that of spinach. Omega-3 fatty acids are a class of polyunsaturated fatty acids that play an important role in the prevention of various cardiovascular diseases and in maintaining a healthy immune system.
Research has shown that omega-3 fatty acids may help reduce cholesterol and triglyceride levels while increasing beneficial high-density lipoprotein (HDL) cholesterol. In addition, their ability to reduce blood viscosity may contribute to improved vascular health.
2. Antibacterial and Antifungal Activity
In antibacterial studies involving traditional Chinese medicinal herbs in mice, purslane demonstrated notable antimicrobial activity. Lectins isolated from the roots of purslane have been reported to inhibit the growth of Enterococcus faecalis, Pseudomonas aeruginosa, and Staphylococcus aureus. These lectins also exhibited antifungal activity against Candida albicans, Candida parapsilosis, Candida krusei, and Candida tropicalis.
In addition, cerebrosides isolated from purslane have shown significant antibacterial activity against intestinal pathogenic bacteria. Furthermore, El-Desouky and colleagues reported that purslane extracts exhibited antifungal activity against three Aspergillus species, namely Aspergillus flavus, Aspergillus ochraceus, and Aspergillus parasiticus.
3. Anti-inflammatory and Immunomodulatory Effects
Di Cagno and colleagues reported that fermented purslane juice was effective in alleviating intestinal inflammation and epithelial damage in the Caco-2 cell line. In another study, aqueous extracts of purslane were found to reduce inflammation in streptozotocin-induced diabetic mice by preventing oxidative stress.
Additional research has demonstrated that a polysaccharide complex isolated from the aerial parts of purslane stimulated CD4+/CD25+ and CD8+/CD25+ human T cells, as well as CD14+ and CD64+ activated phagocytic cells. The polysaccharide complex also enhanced the production of interleukin-6 (IL-6) by human leukocytes and Peyer's patch lymphocytes, suggesting that purslane possesses immunomodulatory activity.
4. Neuroprotective Effects
Both in vitro and in vivo studies have suggested that treatment of PC12 cells with purslane polysaccharides can improve cell viability while reducing the production of reactive oxygen species (ROS). In addition, purslane polysaccharides have been reported to alleviate lead-induced learning and memory impairment by shortening escape latency and reducing dendritic spine loss, thereby demonstrating potential benefits for neurological disorders.
Another study found that administration of betalains extracted from purslane to mice with learning and memory impairment reduced cognitive dysfunction by increasing the levels of superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), and glutathione peroxidase (GPx) in the brain.
5. Anti-aging Potential
Purslane contains abundant phenolic compounds, flavonoids, and volatile constituents, all of which contribute to its strong antioxidant activity. The antioxidant capacity of purslane extracts has been reported to increase in a concentration-dependent manner. Compared with ascorbic acid, purslane extract demonstrated the ability to scavenge up to 93% of DPPH free radicals.
These antioxidant properties may help protect products from oxidative deterioration while reducing free radical-mediated damage to human cells, thereby contributing to healthy aging. Purslane is also rich in selenium, vitamin E, and carotenoids. Selenium is an essential trace element that has been associated with anti-aging effects and enhanced immune function. As an indispensable component of glutathione peroxidase (GSH-Px), selenium contributes to antioxidant enzyme activity and helps prevent lipid peroxidation of biological membranes.
6. Skin Health Benefits
Studies have suggested that purslane may help protect the skin against ultraviolet (UV)-induced damage while promoting wound healing.
1) Promotion of Wound Healing
Mouse studies have found that chronic wound tissues and macrophages exhibit iron deposition, and excessive iron accumulation can delay wound healing. Purslane extract has been reported to accelerate wound healing by promoting angiogenesis and inhibiting iron accumulation in mice.
2) Protection Against UV-Induced Skin Damage
In ultraviolet B (UVB)-induced cellular models, purslane extract reduced the expression levels of ICAM-1, IL-1, IL-6, and TNF-α. These findings indicate that purslane extract exhibits significant antioxidant and anti-inflammatory activities against UV-induced skin damage.
Furthermore, studies have suggested that purslane extract may protect against UV-induced skin photoaging by regulating the miR-138-5p/Sirt1 signaling axis.
3) Additional Potential Health Benefits
In addition to the biological activities described above, purslane has also demonstrated promising potential in studies investigating antidiabetic activity, insomnia, pain relief, and gastroprotective effects. Further research is needed to better understand its mechanisms of action and evaluate its clinical applications.
Applications of Purslane in Multiple Industries
Fresh purslane leaves and stems have a distinctive sour flavor. They are commonly consumed in fresh green salads and can also be pickled or cooked before eating. Today, purslane is primarily utilized in functional foods and cosmetic products.
Functional Foods
Several brands have introduced purslane extract powder products that are marketed to support the health of the skin, heart, eyes, and bones.
Other commercially available products include loose-leaf purslane preparations intended for infusion and consumption as a beverage, as well as vegan capsules formulated to provide antioxidant support for cells throughout the body.
Purslane tincture products are also available on the market. According to product claims, these formulations are intended to support digestive and endocrine system health and may help improve constipation.
Cosmetics and Personal Care
Purslane has also been widely incorporated into cosmetic and skincare formulations. Examples include skincare products formulated with purslane extracts and moisturizing nano-emulsion creams containing purslane as a functional botanical ingredient.
Conclusion
As research continues to uncover the nutritional value and pharmacological potential of purslane, increasing attention is being given to this once-overlooked edible plant. Its rich nutritional profile, diverse bioactive compounds, and broad range of reported biological activities have made it an attractive ingredient for applications in functional foods, dietary supplements, cosmetics, and other health-related products.
Although many of the reported benefits have been supported by in vitro studies, animal experiments, and an expanding body of scientific literature, additional well-designed human clinical studies are still needed to further validate its efficacy and clarify its mechanisms of action. With continued scientific investigation and product innovation, purslane is expected to demonstrate even broader application potential across multiple industries in the future.
References
- Song Jinzhi, Li Ziwei. Population Component Structure and Growth Analysis of Purslane in the Changbai Mountain Region.
- Wang Cong, Wan Yongmei, et al. Effects of Purslane on Blood Lipids, Escherichia coli, and Lactobacillus in Sanhuang Chickens.
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058561/#B27-plants-12-01246
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8741462/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10484659/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3934766/
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10421184/