Goldenseal (Hydrastis canadensis), also called orangeroot or yellow puccoon, is a perennial herb in the buttercup family Ranunculaceae, native to southeastern Canada and the eastern United States. It may be distinguished by its thick, yellow knotted rootstock. The stem is purplish and hairy above ground and yellow below ground where it connects to the yellow rhizome. Goldenseal mostly reproduces clonally through the rhizome. The plant bears two palmate, hairy leaves with 5–7 double-toothed lobes and single, small, inconspicuous flowers with greenish-white stamens in the late spring. In summer, it bears a single berry the size of a large raspberry with 10–30 seeds.
|Scientific classification |
According to the American Cancer Society, "evidence does not support claims that goldenseal is effective in treating cancer or other diseases. Goldenseal can have toxic side effects, and high doses can cause death."
At the time of the European colonization of the Americas, goldenseal was in extensive use among certain Native American tribes of North America, both as a medicine and as a coloring material. Benjamin Smith Barton, in his first edition of Collections for an Essay Toward a Materia Medica of the United States (1798), refers to the Cherokee use of goldenseal as a cancer treatment. Later, he calls attention to its properties as a bitter tonic, and as a local wash for ophthalmia. It became a favorite of the Eclectics from the time of Constantine Raffinesque in the 1830s. Tribes also used goldenseal for digestive issues, as an eyewash, as a diuretic and as a bitter.
Constituents and modern pharmacology
Goldenseal contains the isoquinoline alkaloids hydrastine, berberine, berberastine, hydrastinine, tetrahydroberberastine, canadine and canalidine. A related compound, 8-oxotetrahydrothalifendine, was identified in one study. The United States Pharmacopoeia requires goldenseal sold as a supplement to have hydrastine concentrations of at least 2% and berberine concentrations of at least 2.5%. The requirements in Europe are that hydrastine concentrations be at least 2.5% and that berberine concentrations at least 3%. The hydrastine concentrations of goldenseal plants range between 1.5% and 5%, while the berberine concentrations are usually between 0.5% and 4.5%. Goldenseal is harvested for its rhizomes because the concentrations of hydrastine and berberine in the shoots do not meet these requirements. Berberine and hydrastine act as quaternary bases and are poorly soluble in water but freely soluble in alcohol. The herb seems to have synergistic antibacterial activity over berberine in vitro, possibly as a result of efflux pump inhibitory activity.
Side effects of goldenseal may include "digestive complaints, nervousness, depression, constipation, rapid heartbeat, diarrhea, stomach cramps and pain, mouth ulcers, nausea, seizures, vomiting, and central nervous system depression. High doses may cause breathing problems, paralysis, and even death. Long-term use may lead to vitamin B deficiency, hallucinations, and delirium." In addition, goldenseal may cause brain damage to newborn babies if given directly or if taken by breastfeeding or pregnant mothers, and may affect blood pressure unpredictably because it contains several compounds that have opposite effects on blood pressure.
Taking goldenseal over a long period of time can reduce absorption of B vitamins, and it is cautioned to avoid goldenseal during pregnancy and lactation, with gastrointestinal inflammation and with pro-inflammatory disorders. A 2011 study found rats fed goldenseal constantly for two years had a greater tendency to develop tumors.
Goldenseal has been found to have inhibited cytochrome P450 CYP2D6, CYP3A4 and CYP3A5 activity by approximately 40%, a statistically and clinically significant reduction. CYP2D6 is a known metabolizer of many commonly used pharmaceuticals, such as antidepressants (including all SSRIs except for fluvoxamine), neuroleptics and codeine. Combining goldenseal with such medications should be done with caution and under the supervision of a doctor as it can lead to serious, perhaps fatal, toxicity. Those with a genetic deficiency in these enzymes are at particular risk.
Goldenseal became popular in the mid-nineteenth century. By 1905, the herb was much less plentiful because of overharvesting and habitat destruction. Wild goldenseal is listed in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which by definition means harvest from public land is prohibited and may require a permit to export, although trade of the plants is not deemed to be detrimental to the wildlife population and is otherwise unregulated. The U.S. Fish and Wildlife Service recommends that diggers and harvesters track sales and harvests and prove legality of all harvests.
Canada, as well as 17 of the 27 U.S. states where goldenseal grows natively, have declared it as threatened, vulnerable or uncommon. More than 60 million goldenseal plants are picked each year without being replaced. Although goldenseal's geographical range is wide, it is found in small quantities in these habitats. The core of the herb's range is in the Ohio River Valley, but its population there has decreased by almost half. The process of mountain top removal mining has recently put the wild goldenseal population at major risk from loss of habitat.
Research on harvest effects
Research completed by Albrecht and McCarthy shows that when goldenseal is harvested in the fall season, it has a faster population recovery than with midsummer harvests. However, a study by Douglas et al. showed that goldenseal has the highest concentrations of hydrastine and berberine in the early summer. Their research also showed that three to five years of growth will yield the highest concentration of alkaloids in the plant.
Two experiments done by Sinclair and Catling on the effects of soil turnover, fertilization and transplanting of goldenseal show that disturbances actually benefit the growth of goldenseal. The results from the first growing season of the experiment showed that soil turnover and fertilization combined show the greatest increase in plant biomass, while the results after two growing seasons showed that this group also yielded the highest proportion of flowering plants, fruit production and seed production. Both experiments also showed that soil disturbances benefit the growth of goldenseal.
As of 1998, only 2.4% of goldenseal plant material originated from a cultivated source rather than wild harvest, although that number was projected to rise by 15–30% over the next several years. In response to conservation concerns, research has expanded regarding the propagation success of wild plant material for commercial yield. Because goldenseal grows in patches of interconnected ramets reproducing asexually through clonal propagation, transplanting rhizome propagules into cultivated settings is possible. Seed propagation is also feasible and has advantages such as lower cost and greater genetic variability, but is considered difficult and unpredictable.
Goldenseal may be commercially cultivated through agroforestry in natural settings mirroring the plant's ecological environment, or on farms with artificial shade canopies. Another propagation method of goldenseal utilizes a controlled environment such as a greenhouse growing lab where the plant's environmental needs such as light, water and temperature are artificially simulated. Crop selection and biotechnology experimentation may be employed to increase yield and pharmacological potency. Controlled environments can greatly reduce the amount of time required to grow goldenseal to its desired harvestable state. While forest-cultivated plants double in mass every three to fiveyears, plants can double in mass every 15 weeks in growth chambers and triple in growth when in a course soil medium. Subculturing can take place every 30 days to mass-propagate the plant.
Another option is cultivating goldenseal in new regions. An experiment conducted by Douglas et al. grew goldenseal over a six-year period in a warm, temperate environment in New Zealand. The yields were 74% higher in the sixth year of growth compared to the fourth year of growth, which is when goldenseal is normally harvested. The overall growth of the allochthonous goldenseal was comparable to that found in the United States, and the hydrastine and berberine concentrations were within the American and European standards. Cultivating goldenseal in a New Zealand environment that is similar to its home range is an option to maintain its population.
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