Astragalus membranaceus is a traditional herb with a long history of use in Traditional Chinese Medicine (TCM). The root is primarily valued as an adaptogen, which helps the body respond to stress, and for its capacity to support the immune system. Consumers can find this herb in several forms, each requiring a different method of preparation and consumption.
Available Forms and Preparation Methods
The dried, raw root slices are a traditional method of consumption, typically prepared as a decoction or tea. To create a decoction, the root slices must be simmered in water for 30 minutes to an hour to fully extract the beneficial compounds. This extended simmering time is necessary because active components, like polysaccharides, are not easily released by simple steeping.
Capsules and tablets offer the most convenient way to take the herb, requiring no preparation. This form is appealing for those who want a standardized, measured dose. The root material within these capsules is typically a finely ground powder or a concentrated extract. The powder form itself can also be purchased separately and mixed into a beverage like a smoothie or juice.
Tinctures, or liquid extracts, are a highly concentrated form of Astragalus. They are made by soaking the root in a solvent, usually alcohol or glycerin, to create a potent liquid. Tinctures are administered by placing drops directly under the tongue for rapid absorption or by mixing the liquid into water.
Establishing the Appropriate Dosage
For the raw, dried root used in decoctions, a common traditional daily dosage ranges from 9 to 30 grams. Some traditional Chinese medicine practices may use up to 60 grams per day for a short period, although lower doses are recommended for regular supplementation.
When taking encapsulated products, the dosage is expressed in milligrams. A standard daily intake for powdered root ranges from 600 milligrams to 2 grams, divided into several doses throughout the day. If the capsule contains a standardized extract, the label specifies a concentration ratio, such as 5:1, meaning the extract is five times more concentrated than the raw herb.
Liquid extracts and tinctures are measured in milliliters or drops. A recommended daily amount for a tincture or liquid extract is approximately 2 to 5 milliliters, taken up to three times per day. It is important to strictly adhere to the manufacturer’s recommendations, as potency varies significantly between brands.
Important Safety Considerations and Interactions
Astragalus is generally considered safe for most adults, but specific populations should exercise caution due to its stimulating effects on the immune system. Pregnant and nursing women are advised against using the herb due to insufficient reliable data. Individuals with autoimmune diseases, such as lupus, rheumatoid arthritis, or multiple sclerosis, should also avoid Astragalus, as its immune-enhancing properties could worsen their condition.
The herb has known or suspected interactions with pharmaceutical drugs, necessitating a conversation with a healthcare provider before starting use. Because Astragalus enhances immune system activity, it may reduce the effectiveness of immunosuppressant medications, such as those prescribed after an organ transplant. Astragalus may also interact with blood pressure medications, diuretics, and anticoagulants.
Its potential to lower blood sugar means individuals taking anti-diabetes drugs should closely monitor glucose levels to prevent hypoglycemia. Studies show Astragalus is safe for continuous use at standard doses for up to four months. However, very high doses, exceeding 28 grams per day of the raw herb, may suppress the immune system.