- Huang chi
- Huang qi
- Milk vetch
- Radix astragali
For Patients & Caregivers
Astragalus has immunostimulant effects, but it has not been shown to treat or prevent cancer.
Scientists believe that astragalus works by stimulating several factors of the immune system. In laboratory studies, astragalus extracts increase the activity of monocytes, natural killer cells, and lymphocytes, even when their activity is suppressed by substances such as steroids. In addition, astragalus reversed immune suppression from cyclophosphamide (a commonly used chemotherapy drug) in rats.
Astragalus extracts also protected liver cells from chemical injury in animals and in laboratory studies. Studies conducted in China suggest that astragalus may protect the kidneys when used in combination with the herb Angelica sinensis. In senile rats, astragalus increased the ability of their brain cells to respond to stimuli, but it is still unknown if these effects occur in humans.
An herbal formula containing astragalus has been shown to reduce fatigue in athletes by increasing uptake and use of oxygen.
- To stimulate the immune system
Laboratory studies and some clinical trials suggest that astragalus stimulates the immune system.
- To reduce the severity of chemotherapy side effects, including immune suppression
Studies in animals show that astragalus reverses the immune suppression caused by cyclophosphamide and stimulates certain cells of the immune system. Astragalus may reduce the side effects of chemotherapy in colorectal cancer patients.
- To fight bacterial infections
There is no evidence to support this claim.
- To prevent and treat heart disease
No scientific evidence supports this use.
- To treat HIV and AIDS
Scientific evidence to support this use is lacking.
- To treat common cold
Although laboratory studies and one clinical trial suggest that astragalus stimulates certain cells of the immune system, there is no evidence from clinical trials that astragalus can treat common cold.
- To treat diabetes
This claim is not backed by scientific data.
- You are taking immunosuppressants such as tacrolimus and cyclosporine (astragalus may lessen their effects).
- You are taking Cyclophosphamide: Astragalus may decrease cyclophosphamide-induced immunosuppression.
- You are taking Aldesleukin (a drug used to treat skin and kidney cancers): When taken with astragalus there was a ten-fold increase in tumoricidal activity of aldeskeukin, with decreased side effects.
For Healthcare Professionals
Astragalus root has a long history of use in Traditional Chinese Medicine to increase metabolism, stamina, strength and vitality. Studies done in China suggest that astragalus, when used with Angelica sinensis, has reno protective effects (6). It also decreases the proteinuria associated with idiopathic membranous nephropathy (7) and exhibits natriuretic property (8). When used as injection, Astragalus benefits patients with IgA nephropathy (26). In other studies Astragalus was shown to suppress airway hyper reactivity associated with allergic asthma in vivo (9) and increase M-cholinergic receptor density in senile rats (11), which suggests that it may have a role in combating senility. Astragalus extract acts as a nerve-growth promoting factor in vitro and in vivo (17), and alleviates obstructive uropathy in mice in combination with A. sinensis and standard care (18).
A formula containing astragalus as a major ingredient has been shown to reduce fatigue in athletes (10).
Astragalus has been studied for its anticancer potential but evidence is limited. Astragalus extracts were shown to inhibit tumor growth (5), delay chemical-induced hepatocarcinogenesis in rats (4), and demonstrate antiangiogenic property (19). In vitro, animal, and anecdotal human data show that it reduces immune suppression, a side effect of chemotherapy (1) (2), and may also enhance the effects of platinum-based chemotherapy (3). However, Astragalus also has antioxidant activity (25). This may interfere with the actions of certain chemotherapy drugs.
Conclusions from a meta-analysis suggest benefits of astragalus-based treatments for hepatocellular cancers, but data need to be evaluated in larger, well designed trials (16).
Use of an injectable form of astragalus with vinorelbine and cisplatin in patients with advanced non-small cell lung cancer (NSCLC) (20) resulted in improvement in quality of life. However, it is not known whether orally administered astragalus will exert the same effects. In another study, an astragalus extract was found effective in managing cancer-related fatigue (22).
Astragalus demonstrated estrogenic effects in vitro (23). Studies are needed to determine if it affects hormone-sensitive cancers.
Astragalus works by stimulating several factors of the immune system. Its polysaccharide components potentiate immune-mediated antitumor activity of interleukin-2 in vitro (13), improve the responses of lymphocytes from normal subjects and cancer patients, enhance natural killer (NK) cell activity of normal subjects, potentiate activity of monocytes (14), and increasing phagocytosis perhaps by regulating tumor necrosis factor (TNF) production (5).
The saponins present in astragalus potentiate NK cell activity and restore steroid-inhibited NK cell activity in vitro. They also increase phagocytosis and demonstrate hepatoprotective effects on chemically-induced liver injury in vitro (6) and in vivo (4).
Studies conducted in China suggest that astragalus, when used with Angelica sinsensis, exerts reno protective effects by mediating gene expression. Astragaloside IV, a saponin, increases tissue-type plasminogen activator (t-PA) synthesis and downregulates the expression of plasminogen activator inhibitor type 1 (PAI-1) (21). In IgA nephropathy patients, Astragalus injection decreases Cosmc gene expression and increases IgA1 O-glycosylation level (26). Astragalus also increases M-cholinergic receptor density in senile rats, suggesting that astragalus may have a role in combating brain senility (11).
In another study, a formula containing astragalus reduced fatigue in athletes by increasing the uptake and utility of oxygen (10). When combined with Paeonia lactiflora, astragalus demonstrated synergistic antioxidant activity (25).
- Immunosuppressants: Theoretically, astragalus may antagonize the effects of immunosuppressants such as tacrolimus and cyclosporine.
- Aldesleukin: Concomitant treatment with astragalus resulted in 10-fold potentiation of tumoricidal activity with decreased side effects (14).
- Cyclophosphamide: Astragalus may reduce cyclophosphamide-induced immunosuppression (1).