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American ginseng

     

American ginseng

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American ginseng
Panax quinquefolius00.jpg
Panax quinquefolius[1]
Conservation status

Vulnerable (NatureServe)[2]
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Asterids
Order:Apiales
Family:Araliaceae
Subfamily:Aralioideae
Genus:Panax
Species:P. quinquefolius
Binomial name
Panax quinquefolius
L.

American ginseng (Panax quinquefoliusPanacis quinquefolis) is a herbaceous perennial plant in the ivy family, commonly used as Chinese or traditional medicine. It is native to eastern North America, though it is also cultivated in China.[3][4]

As of 2018, there is little to no evidence that ginseng is effective against the common cold.[5]

The plant's root and leaves were traditionally used for medicinal purposes by Native Americans. Since the 18th century, the roots have been collected by "sang hunters" and sold to Chinese or Hong Kong traders, who often pay high prices for particularly old wild roots.[6] It is also known by its Chinese name huaqishen (simplified Chinese: 花旗参; traditional Chinese: 花旗參; pinyinhuāqíshēnCantonese Yalefākèihsām; literally: "Flower Flag ginseng") or xiyangshen (simplified Chinese: 西洋参; traditional Chinese: 西洋參; pinyin: xīyángshēn; Cantonese Yale: sāiyèuhngsām; literally: "west ocean ginseng").

Contents

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Description[edit]

The aromatic root of American ginseng (Panax quinquefolius) resembles a small parsnip that forks as it matures. The plant grows 6" to 18" tall, usually bearing three leaves, each with three to five leaflets, 2" to 5" long.

Traditional medicine[edit]

There is no evidence that American ginseng is effective in those infected with the common cold.[5] When used preventively it makes no difference on the rate of infections.[7] It also appears to have no effect on how severe the infections are.[7] There is tentative evidence that it may lessen the length of sickness when used preventively.[7]

Ginsenosidesphytochemicals of the Panax species, are being studied for potential biological properties.[8]

Adverse effects[edit]

Individuals requiring anticoagulant therapy such as warfarin should avoid use of ginseng.[5] It is not recommended for individuals with impaired liver or renal function, or during pregnancy or breastfeeding.[5] Other adverse effects include: headaches, anxiety, trouble sleeping and an upset stomach.[5]

Recent studies have shown that through the many cultivated procedures that American ginseng is grown, fungal molds, pesticides, and various metals and residues have contaminated the crop. Though these contaminating effects are not considerably substantial, they do pose health concerns that could lead to neurological problems, intoxication, cardiovascular disease and cancer.[9]

Production[edit]

American ginseng was formerly particularly widespread in the Appalachian and Ozark regions (and adjacent forested regions such as PennsylvaniaNew York and Ontario), due to its popularity and unique habitat requirements, the wild plant has been overharvested, as well as lost through destruction of its habitat, and is thus rare in most parts of the United States and Canada.[10] Ginseng is also negatively affected by deer browsing, urbanization, and habitat fragmentation.[11] It can also be grown commercially, under artificial shade, woods cultivated, or wild-simulated methods and is usually harvested after three to four years depending on cultivation technique; the wild-simulated method often requires up to 10 years before harvest.

Ontario, Canada is the world's largest producer of North American ginseng.[12] Marathon County, Wisconsin, accounts for about 95% of production in the United States.[13]

Most American ginseng is produced in the Canadian provinces of Ontario and British Columbia and the American state of Wisconsin.[14]

Woods-grown American ginseng programs in Vermont, Maine, Tennessee, Virginia, North Carolina, Colorado, West Virginia, and Kentucky,[15] have been encouraging the planting of ginseng both to restore natural habitats and to remove pressure from any remaining wild ginseng.

Consumption[edit]

Since the 18th century, American ginseng (P. quinquefolius) has been primarily exported to Asia, where it is highly valued for perceived superior quality and sweet taste.[16]

Chemical components[edit]

Chemical structure of protopanaxadiol

Like Panax ginseng, American ginseng contains dammarane-type ginsenosides, or saponins, as the major biologically active constituents. Dammarane-type ginsenosides include two classifications: 20(S)-protopanaxadiol (PPD) and 20(S)-protopanaxatriol (PPT). American ginseng contains high levels of Rb1, Rd (PPD classification), and Re (PPT classification) ginsenosides—higher than that of P. ginseng in one study.[17]

Pharmacokinetics[edit]

When taken orally, PPD-type ginsenosides are mostly metabolized by intestinal bacteria (anaerobes) to PPD monoglucoside, 20-O-beta-D-glucopyranosyl-20(S)-protopanaxadiol (M1).[18] In humans, M1 is detected in plasma from seven hours after intake of PPD-type ginsenosides and in urine from 12 hours after intake. These findings indicate M1 is the final metabolite of PPD-type ginsenosides.[19]

M1 is referred to in some articles as IH-901,[20] and in others as compound-K.[19]

Society and culture[edit]

Cold-fX is a product derived from the roots of North American ginseng (Panax quinquefolius). The makers of Cold-fX, were criticized for making health claims about the product that have never been tested or verified scientifically. Health Canada's review of the scientific literature confirmed that this is not a claim that the manufacturer is entitled to make.[21]

Distribution[edit]

Range map of American ginseng (Panax quinquefolius).

American Ginseng can be found in much of the eastern and central United States and in part of southeastern Canada.[22]It is found primarily in deciduous forests of the Appalachian and Ozark regions of the United States.[23] American ginseng is found in full shade environments in these deciduous forests underneath hardwoods.[24] Due to this very specialized growing environment and its demand in the commercial market it has started to reach an endangered status in some areas. It can be found throughout eastern Canada and the northeastern United States.[25]

Endangered status[edit]

In the United States, American ginseng is generally not listed as an endangered species, but it has been declared as a part of the endangered species scale by some states. States recognizing American ginseng as endangeredMaineRhode Island. States recognizing American ginseng as vulnerableNew YorkPennsylvania. States recognizing American ginseng as threatenedMichiganNew HampshireVirginia. States recognizing American ginseng as a special concernConnecticut,[26] MassachusettsNorth CarolinaTennessee.[22]

History[edit]

Originally, American ginseng was imported into China via subtropical Guangzhou, the seaport next to Hong Kong.[citation needed]

Since American ginseng was originally imported into China via a subtropical seaport, Chinese doctors believed American ginseng must be good for yang, because it came from a hot area. They did not know, however, that American ginseng can only grow in temperate regions. Nonetheless, the root is legitimately classified as more yin because it generates fluids.[27]


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