Common nameFleur-de-Lis
Botanical name
Botanical name
Iris versicolor
Parts used and where grown
The rhizome, or underground stem, of the blue flag (indicating its showy blue flowers) is used medicinally. Blue flag and closely related species (particularly Iris missouriensis, western blue flag) grow across North America.
Blue flag has been used in connection with the following conditions (refer to the individual health concern for complete information):
Science Ratings - Health Concerns
* - Impetigo (topical)
*** - Reliable and relatively consistent scientific data showing a substantial health benefit.
Parts used and where grown
The rhizome, or underground stem, of the blue flag (indicating its showy blue flowers) is used medicinally. Blue flag and closely related species (particularly Iris missouriensis, western blue flag) grow across North America.
Blue flag has been used in connection with the following conditions (refer to the individual health concern for complete information):
Science Ratings - Health Concerns
* - Impetigo (topical)
*** - Reliable and relatively consistent scientific data showing a substantial health benefit.
** - Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
* - For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support and/or minimal health benefit.
Historical or traditional use (may or may not be supported by scientific studies)
Based on Native American traditions, Eclectic physicians (19th century doctors who relied on herbs) and herbalists used blue flag for a number of conditions. Of note was its use as a nonspecific immune enhancer, as a laxative, and to detoxify the intestinal tract.1 Topical application of fresh, sliced rhizomes to the sores of impetigo (a common bacterial skin infection in children) has been recommended by herbalists.2 Traditional herbalists have used blue flag to treat poor digestion characterized by fat malabsorption.
Active constituents
The resinous fraction of blue flag contains numerous phenolic glycosides. Traditional herbal texts suggest these constituents stimulate the parasympathetic nervous system, leading to production of bile, saliva, and sweat.3 However, modern clinical trials have not confirmed these effects for blue flag.
How much is usually taken?
Herbalists sometimes recommend up to 10 drops of tincture of the dried rhizome be taken three times per day.4 The tea form is unlikely to be effective, since the active compounds in blue flag are not water soluble.
Are there any side effects or interactions?
Blue flag can cause nausea, vomiting, and loose stools if too much is taken.5 People should not exceed the recommended amount given above. Fresh rhizome should only be applied topically and never taken internally, since it can irritate the mouth6 and is much more likely to cause nausea and diarrhea. Blue flag should only be taken on the advice of a physician or herbalist trained in its use. Blue flag is unsafe for use during pregnancy or breast-feeding. People should not give blue flag to children.
At the time of writing, there were no well-known drug interactions with blue flag.
Source: www.cncahealth.com
Historical or traditional use (may or may not be supported by scientific studies)
Based on Native American traditions, Eclectic physicians (19th century doctors who relied on herbs) and herbalists used blue flag for a number of conditions. Of note was its use as a nonspecific immune enhancer, as a laxative, and to detoxify the intestinal tract.1 Topical application of fresh, sliced rhizomes to the sores of impetigo (a common bacterial skin infection in children) has been recommended by herbalists.2 Traditional herbalists have used blue flag to treat poor digestion characterized by fat malabsorption.
Active constituents
The resinous fraction of blue flag contains numerous phenolic glycosides. Traditional herbal texts suggest these constituents stimulate the parasympathetic nervous system, leading to production of bile, saliva, and sweat.3 However, modern clinical trials have not confirmed these effects for blue flag.
How much is usually taken?
Herbalists sometimes recommend up to 10 drops of tincture of the dried rhizome be taken three times per day.4 The tea form is unlikely to be effective, since the active compounds in blue flag are not water soluble.
Are there any side effects or interactions?
Blue flag can cause nausea, vomiting, and loose stools if too much is taken.5 People should not exceed the recommended amount given above. Fresh rhizome should only be applied topically and never taken internally, since it can irritate the mouth6 and is much more likely to cause nausea and diarrhea. Blue flag should only be taken on the advice of a physician or herbalist trained in its use. Blue flag is unsafe for use during pregnancy or breast-feeding. People should not give blue flag to children.
At the time of writing, there were no well-known drug interactions with blue flag.
Source: www.cncahealth.com