Written by Anna Boetto.
Few herbs illustrate the meeting point between traditional Chinese medicine and modern functional medicine quite as beautifully as Astragalus.
Known in Chinese medicine or TCM as Huang Qi (黄芪), Astragalus has been prescribed for more than 2,000 years to strengthen vitality, support recovery and reinforce the body's resistance to illness. Today, it is also one of the most widely recognised herbal medicines for Astragalus immune support.
As a Chinese medicine and functional integrative medicine practitioner, I find Astragalus particularly interesting because traditional observations made centuries ago increasingly overlap with modern research into immune regulation, inflammation, oxidative stress and cellular resilience.
An Ancient Chinese Remedy
Huang Qi is the dried root of medicinal Astragalus species, traditionally Astragalus membranaceus and its closely related botanical varieties.
Its medicinal use can be traced to the ancient Chinese herbal classic the Shen Nong Ben Cao Jing (Divine Farmer's Classic of Materia Medica), compiled around the Han Dynasty. It was classified among the text's "superior" herbs – medicines considered suitable for strengthening the body and supporting long-term health.
Later Chinese physicians continued to regard Huang Qi as one of the important herbs for strengthening Qi.
Qi is sometimes translated simply as "energy", but this doesn't quite capture its meaning in Chinese medicine. It is better understood as the functional vitality that enables the body to digest food, generate energy, circulate blood and fluids, maintain tissue integrity and defend itself against illness.
The name Huang Qi itself is revealing: Huang means "yellow", referring to the characteristic yellow colour of the root, while qi denotes that it is the root of the plant which is used medicinally.
What Does Astragalus Do in Chinese Medicine?
Traditional Chinese herbal texts, including Bensky and Clavey's Chinese Herbal Medicine: Materia Medica, describe Huang Qi as sweet and slightly warm, primarily entering the Lung and Spleen systems.
Its traditional actions include:
- strengthening Spleen Qi and improving vitality
- strengthening Lung Qi and the body's defensive Wei Qi
- reducing spontaneous sweating associated with deficiency
- raising "sinking" Qi
- supporting fluid metabolism and mild oedema
- promoting tissue repair and healing.
The concept of Wei Qi is particularly interesting from an integrative perspective. In TCM, Wei Qi circulates around the body's exterior and helps protect us against external pathogens. Although it cannot simply be equated with the immune system, there are obvious parallels with modern concepts of barrier defence and immune surveillance.
This is why Huang Qi appears in the famous Chinese remedy Yu Ping Feng San, or "Jade Windscreen Powder", traditionally prescribed to strengthen people who seem particularly susceptible to recurrent respiratory infections.
Astragalus Immune Support: What Does Modern Science Say?
Modern research has identified several important groups of compounds within Astragalus, particularly polysaccharides, flavonoids and triterpenoid saponins, including the much-studied astragaloside IV.
These compounds demonstrate immunomodulatory, antioxidant and anti-inflammatory activity in experimental research. Rather than thinking of Astragalus simply as an "immune booster", immune modulation is probably the more appropriate description.
Laboratory and animal studies suggest Astragalus polysaccharides can influence macrophages, lymphocytes, cytokine signalling and other components of innate and adaptive immunity. Research has also investigated possible cardiovascular, renal, metabolic and neuroprotective effects.
There is some promising human research, including studies examining Astragalus as an adjunct in kidney disease and other chronic conditions. However, many of the broader claims surrounding Astragalus still come from laboratory, animal or relatively small clinical studies. It should therefore not be presented as a treatment or cure for these diseases.
This distinction is important in functional integrative medicine: traditional knowledge can guide us toward potentially valuable medicines, while modern research helps us understand their mechanisms, limitations and appropriate clinical application.
From Mongolia to the Materia Medica
Astragalus is a member of the legume or pea family. Medicinal Huang Qi originates particularly from northern China and Inner Mongolia, with important growing regions including Shanxi, Gansu, Heilongjiang and Inner Mongolia.
In Chinese herbal medicine there is an important concept called dao-di, referring to herbs produced in geographic regions traditionally associated with superior medicinal quality.
This turns out to have a modern scientific basis. Research has found that geography, climate, plant age, harvesting and processing can influence the concentrations of Astragalus's active constituents.
The roots are traditionally harvested in spring or autumn, cleaned, sliced and dried. Huang Qi may be used raw or processed with honey. Honey-prepared Zhi Huang Qi is traditionally considered more strongly tonifying to Qi and the Spleen.
Interestingly, increasing demand has meant that cultivated Astragalus has largely replaced wild harvesting – an important consideration for sustainability as well as medicinal quality.
How Is Astragalus Taken?
In a Chinese medicine clinic, Astragalus is rarely prescribed simply because someone wants to "boost their immunity". It is selected according to the person's overall pattern and is usually combined with other herbs to create a balanced formula.
Traditionally, dried Astragalus root is simmered in water as part of a decoction. Typical Chinese herbal doses are approximately 9–30 grams of dried root daily, although substantially larger doses have historically been used for particular clinical indications under professional supervision.
Astragalus is now also available as granules, powders, liquid extracts and capsules.
Slices of the root can even be incorporated into soups and broths – a lovely example of the blurred boundary between food and medicine that exists throughout Chinese culture.
Is Astragalus Safe for Everyone?
Astragalus generally has a good safety profile, but "natural" does not automatically mean appropriate for everyone.
Traditional Chinese medicine cautions against indiscriminate use of Huang Qi during certain acute illnesses or where the person's underlying pattern does not call for a Qi tonic.
From an integrative perspective, additional care is appropriate for people taking immunosuppressant, anticoagulant, antihypertensive or diuretic medications, and anyone undergoing cancer treatment should discuss herbal medicines with their oncology team and suitably qualified practitioner.
This is also why I prefer to think of Astragalus as a regulatory and restorative herb, rather than simply an immune stimulant.
Where Ancient Medicine Meets Modern Science
Perhaps the most fascinating thing about Astragalus is not that contemporary science has "proved" Chinese medicine. The two medical systems describe physiology through very different languages.
What is interesting is where their observations begin to converge.
Chinese physicians described Huang Qi as strengthening vitality, supporting the body's defences, improving recovery and helping weakened tissues heal. Modern researchers are now investigating the same plant through the languages of immunology, oxidative stress, inflammation, cellular signalling and tissue protection.
More than two millennia after Huang Qi first appeared in the Chinese Materia medica, this unassuming yellow root remains one of the most important tonic herbs in Chinese medicine, and one of the most intriguing examples of a traditional Chinese remedy finding a place within contemporary functional and integrative healthcare.
References
Bensky, D., Clavey, S., & Stöger, E. (2004). Chinese Herbal Medicine: Materia Medica (3rd ed.). Eastland Press.
Gong, A.G.W., et al. (2018). Evaluation of the pharmaceutical properties and value of Astragali Radix. Medicines, 5(2), 46.
Ma, X.Q., Shi, Q., Duan, J.A., Dong, T.T.X., & Tsim, K.W.K. (2002). Chemical analysis of Radix Astragali (Huangqi) in China: A comparison with its adulterants and seasonal variations. Journal of Agricultural and Food Chemistry, 50(17), 4861–4866.
Shahzad, M., Shabbir, A., Wojcikowski, K., Wohlmuth, H., & Gobe, G.C. (2016). The antioxidant effects of Radix Astragali in protecting tissues from injury and disease. Current Drug Targets, 17(12), 1331–1340.
Zhang, Y., et al. (2024). Astragali radix (Huangqi): A time-honored nourishing herbal medicine. Frontiers in Pharmacology.
Memorial Sloan Kettering Cancer Center. Astragalus – About Herbs, Botanicals & Other Products.
