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| Date:
11-15-2010 | HC# 071044-412
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Re: Herbal Approaches to the Prevention and Treatment of Viral Hepatitis
Yarnell E, Abascal K. Herbal medicine for viral
hepatitis. Altern Complement Ther. June
2010;16(3)151-157. Several
strains of hepatitis viruses cause serious illness worldwide. Hepatitis virus A
(HAV) and B (HBV), now fairly well controlled in the developed world due to the
availability of vaccines, remain common in the developing world. There is no
vaccine for hepatitis virus C (HCV), although it, too, has been reduced in
developed countries by screening blood products. Intravenous (i.v.) drug users
are at risk for contracting HCV.
HAV causes
acute hepatitis. There is no effective treatment. HBV causes chronic hepatitis
treated by several drugs. All are costly, risky, and offer uncertain benefits. HCV
causes chronic hepatitis treated with injected pegylated interferon and oral
ribavirin. This treatment is expensive, often causes adverse effects, and is
often ineffective, especially against the HCV genotype most common in the US and Europe.
Andrographis
(Andrographis paniculata) leaf, from Southeast Asia, is used traditionally for liver problems.
In some studies, it has also proven beneficial in acute upper respiratory viral
infections. In one open trial and a Chinese case series, andrographis sped
symptom resolution in acute HAV. Milk thistle (Silybum marianum) seeds and silymarin, a flavonolignan complex found
in them, have shown benefits in several strains of acute hepatitis and other
viruses. An Indian formula, Liv.52, was deemed effective in acute hepatitis in
low-quality clinical trials. Despite limitations of the reports, it appears this
combination of caper bush (Capparis
spinosa), chicory (Cichorium intybus),
arjuna (Terminalia arjuna), black
nightshade (Solanum nigrum), and
other herbs is more effective than placebo. Chinese herbalists have used
yin-chen wormwood (Artemisia capillaris),
and a formula with this herb and others, Yin
Chen Hao Tang, in acute hepatitis with jaundice. Mexican white sagebrush (A. ludoviciana) can substitute for yin-chen
wormwood. Many antiviral herbs might help people recover from acute hepatitis
more quickly, such as osha (Ligusticum
porteri), lomatium (Lomatium
dissectum), or St. John’s
wort (Hypericum perforatum). A base
formula for acute HAV uses 40% dandelion (Taraxacum
officinale) root with andrographis, Mexican white sagebrush, osha, and
licorice (Glycyrrhiza glabra).
Chronic HCV
progresses slowly to cirrhosis of the liver or hepatocellular carcinoma (HCC).
One large trial has demonstrated that interferon treatment for several years
was ineffective in halting progression. Glycyrrhizin, a licorice triterpenoid
saponin, given by i.v. injection with glycine and cysteine, reduced serum
levels of alanine aminotransferase in HCV patients but did not show clear
improvement in liver histology. In Japan, the same combination, Stronger
Neominophagen C (SNMC), reduced the risk of cirrhosis and HCC. I.v. glycyrrhizin
has also been combined with ursodeoxycholic acid, ribavirin, and phlebotomy to reduce
systemic iron and oxidative load. High doses of glycyrrhizin can lead to sodium
retention and low potassium levels, in a dose-related toxic response. Oral
licorice products might benefit those who cannot tolerate or do not have access
to i.v. treatments. Many studies have shown that phlebotomy and a low-iron diet
reduce progression to HCC. Some clinical trials, most published before HBV and HCV
were clearly distinguished from each other, found that silymarin extracts could
prolong lives of patients with chronic hepatitis. A recent Cochrane
meta-analysis found that silymarin can prevent death from liver disease in
general. This benefit is not evident when only the highest quality trials are
considered. Silymarin research often involves patients with many different
liver problems. Thus, its specific effects in hepatitis remain unclear.
Many herbs
deserve more study in relation to HCV. Among immunomodulators, schisandra (Schisandra chinensis) and astragalus (Astragalus membranaceus) are
traditionally considered liver supportive. Hepatoprotective herbs include
burdock (Arctium lappa). Turmeric (Curcuma longa) has a strong history as a
liver protective, is anti-inflammatory, and guards against iron overload.
Chronic HBV
is more likely than HCV to progress to cirrhosis and HCC. Long-term drug
therapy often creates viral resistance. A traditional Eastern formula (in
Chinese, Xiao Chai Hu Tang; in Japanese
shosaiko-to), Minor Bupleurum
Decoction, combines bupleurum (Bupleurum
falcatum), peony (Paeonia lactiflora),
pinellia (Pinellia ternata), cassia (Cinnamomum aromaticum syn. C. cassia), ginger (Zingiber officinale), jujube (Ziziphus jujuba
var. spinosa) and other herbs. Used
prior to 220 B.C.E., this formula is very useful in epilepsy. Trials have
demonstrated its ability to reduce serum transaminase levels and HBe antigen
levels in HBV patients, and to prevent HCC. Patients without hepatitis surface
antigen (HBs) had the best results. An extract of Chinese salvia (Salvia miltiorrhiza) inhibits HBV in
vitro and is reported to reduce liver fibrosis caused by chronic HBV. A Chinese
salvia compound, salvianolic acid B, also reduces fibrosis. One trial found
that Chinese salvia combined with the anti-HBV drug lamivudine was more
effective than either agent alone. A modern Chinese formula, Fuzheng Huayu, in several clinical
trials, reversed fibrosis and inflammation in HCV. Ingredients include Chinese
salvia, gynostemma (Gynostemma
pentaphyllum), a fermented mycelium powder, and other herbs. Milk thistle
has also been studied in HBV and may reduce mortality. As in HCV, glycyrrhizin
and SNMC injections can be helpful in HBV. Finally, seeds of ginkgo (Ginkgo biloba) have been used in a
Chinese open trial to prevent cirrhosis in HBV, but results, published only in
Chinese, were unavailable to the authors.
—Mariann Garner-Wizard
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