Hydrastis canadensis
An American native,
goldenseal is a member of the buttercup family that once grew in great
abundance in the eastern deciduous forests of the United States. The golden part of its common name comes from the bright yellow interior of the plant’s fleshy rhizomes (underground stems). Seal
is a reference to small, circular marks on the rhizome’s twisted,
wrinkled surface that were thought to resemble the decorative seals once
used to stamp warm wax onto envelope flaps.
Native American tribes used goldenseal to produce a
beautiful golden yellow dye. They also used the herb medicinally and
introduced European settlers to its healing properties in the 1700s. A
century later, goldenseal had gained such popularity that it was
severely overharvested, an assault that continued into the 20th century,
until wild stocks were legally protected. Now cultivated, but still
scarce in the wild, goldenseal is a top-selling herbal supplement
marketed to aid digestion, to treat infection, and to boost the immune
system.
Therapeutic Uses
Digestive aid
Diarrhea
Antimicrobial
Woodland goldenseal is one of the best-known
indigenous North American plants. It was widely used by eastern tribes.
Goldenseal was an official drug in the United States almost continuously
from 1830 to 1955. During the late 19th and early 20th centuries, a number
of pharmaceutical companies, including Parke-Davis, Eli Lilly, and
Squibb, manufactured and sold goldenseal products. Today, goldenseal
remains a popular herbal remedy in the United States, particularly for
the treatment of gastrointestinal complaints.
Looking to the past can often prove useful when
researching medicinal plants. As a clear demonstration of that,
scientists at the University of Chicago recently found, in test-tube
studies, that goldenseal extracts are highly active against multiple
strains of Helicobacter pylori, a bacterium that is responsible
for the majority of peptic ulcers and gastric cancers. While there are
many compounds that contribute to the overall medicinal effects of
goldenseal, berberine, a yellow alkaloid, is the primary infection
fighter. Berberine destroys many microorganisms that cause diarrhea,
including Giardia lamblia and Entamoeba histolytica.
These organisms cause chronic diarrhea and can lead to significant
dehydration and weight loss. Goldenseal and other plants containing
berberine could play an important public health role, given that
approximately 20 percent of the world’s population is chronically
infected with Giardia and some 50 million people are infected with the amoeba E. histolytica.
Goldenseal can be found in salves and ointments
designed to help heal skin infections. Research has shown that berberine
is effective for the treatment of psoriasis and may also be useful for
minor fungal infections of the skin. While the taste of goldenseal is
quite bitter, it can be very effective as a mouthwash and can also be
used for treating canker sores and mouth ulcers.
How to Use
Tea: Due to its bitterness, goldenseal is quite unpalatable as a tea.
Capsule: Generally, 1 to 3 g per day.
Tincture: Take 2 to 4 ml, 2 to 3 times per day.
Topical: Salves and ointments are readily available. Use as directed.
Precautions
Goldenseal may stimulate uterine contractions and
is therefore generally not recommended for use during pregnancy.
Goldenseal can also interact with enzymes in the body that metabolize
certain prescription medications. People taking other medications should
check with their health-care professionals or pharmacists before taking
goldenseal.
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