Valerian (Valeriana officinalis, Caprifoliaceae) is a perennial flowering plant, with heads of sweetly scented pink or white flowers that bloom in the summer. Valerian flower extracts were used as a perfume in the 16th century.
Other names used for this plant include garden valerian (to distinguish it from other Valeriana species), garden heliotrope (although not related to Heliotropium), and all-heal (which is also used for plants in the genus Stachys). Red valerian, often grown in gardens, is also sometimes referred to as "valerian", but is a different species (Centranthus ruber) from the same family and not very closely related.
Valerian in pharmacology and herbal medicine is the name of a herb or dietary supplement prepared from roots of the plant. Crude extract of the root is often sold in the form of capsules. Valerian root has sedative and anxiolytic effects. It can also be classified as a drug, since its consumption produces a sedative or medicinal effect, while it is not exclusively a type of food. These effects are suspected to be mediated through the GABA receptor. The amino acid valine is named after this plant.
- 1 History
- 2 Etymology
- 3 Valerian extract
- 4 Effect on other organisms
- 5 Floral symmetry
- 6 See also
- 7 References
- 8 External links
Valerian has been used as a medicinal herb since at least the time of ancient Greece and Rome. Hippocrates described its properties, and Galen later prescribed it as a remedy for insomnia. In medieval Sweden, it was sometimes placed in the wedding clothes of the groom to ward off the "envy" of the elves. In the 16th century, the Anabaptist reformer Pilgram Marpeck prescribed valerian tea for a sick woman.
Known compounds detected in valerian that may contribute to its method of action are:
- Alkaloids: actinidine, chatinine, shyanthine, valerianine, and valerine
- Isovaleramide may be created in the extraction process.
- Gamma-aminobutyric acid (GABA)
- Isovaleric acid
- Iridoids, including valepotriates: isovaltrate and valtrate
- Sesquiterpenes (contained in the volatile oil): valerenic acid, hydroxyvalerenic acid and acetoxyvalerenic acid
- Flavanones: hesperidin, 6-methylapigenin, and linarin
Mechanism of action
Because of valerian's historical use as a sedative, antiseptic, anticonvulsant, migraine treatment, and pain reliever, most basic science research has been directed at the interaction of valerian constituents with the GABA neurotransmitter receptor system. Many studies remain inconclusive and all require clinical validation. The mechanism of action of valerian in general, and as a mild sedative in particular, has not been fully elucidated. However, some of the GABA-analogs, particularly valerenic acids as components of the essential oil along with other semivolatile sesquiterpenoids, generally are believed to have some affinity for the GABAA receptor, a class of receptors on which benzodiazepines are known to act. Valeric acid, which is responsible for the typical odor of mostly older valerian roots, does not have any sedative properties.
Valerian also contains isovaltrate, which has been shown to be an inverse agonist for adenosine A1 receptor sites. This action likely does not contribute to the herb's sedative effects, which would be expected from an agonist, rather than an inverse agonist, at this particular binding site. Hydrophilic extractions of the herb commonly sold over the counter, however, probably do not contain significant amounts of isovaltrate. Valerenic acid in Valerian stimulates serotonin receptors as a partial agonist.
The chief constituent of valerian is a yellowish-green to brownish-yellow oil which is present in the dried root, varying from 0.5 to 2.0%, though an average yield rarely exceeds 0.8%. This variation in quantity is partly explained by location; a dry, stony soil yields a root richer in oil than one that is moist and fertile. The volatile oils that form the active ingredient are extremely pungent, somewhat reminiscent of well-matured cheese. Though some people remain partial to the earthy scent, some may find it to be unpleasant, comparing the odor to that of unwashed feet. Valerian tea should not be prepared with boiling water, as this may drive off the lighter oils.
Valerian is most often used to treat insomnia. It can be considered an alternative treatment for hypnotic drugs. It is also sometimes used as an alternative for sedatives, such as benzodiazepines in the treatment of certain anxiety disorders. Whether or not valerian is an efficacious treatment for insomnia is still a very open question. Multiple recent systematic reviews of the medical research literature and meta-analyses have produced conflicting conclusions regarding its efficacy. One systematic review and meta-analysis published in 2006 concluded, "The available evidence suggests that valerian might improve sleep quality without producing side effects." An article in the Medical Science Monitor states that, "...based on cellular and animal studies as well as human clinical trials the literature supports a role for these preparations [including valerian root] as useful alternatives in the management of the stress and anxiety of everyday life." However, another systematic review, published in 2007 in the journal Sleep Medicine Reviews, concluded valerian was safe but not clinically efficacious for insomnia.
Oral forms, usage, and adverse effects
Oral forms are available in both standardized and unstandardized forms. Standardized products may be preferable considering the wide variation of the chemicals in the dried root, as noted above. When standardized, it is done so as a percentage of valerenic acid or valeric acid.
Few adverse events attributable to valerian have been reported. Large doses may result in stomachache, apathy, and a feeling of mental dullness or mild depression.[medical citation needed] Because of the herb's tranquilizer properties, it may cause dizziness or drowsiness, effects that should be considered before driving or operating heavy or hazardous equipment.[unreliable medical source?]
Because the compounds in valerian produce central nervous system depression, they should not be used with other depressants, such as ethanol, benzodiazepines, barbiturates, opiates, kava, or antihistamine drugs. Moreover, non-pregnant adult human hepatotoxicity has been associated with short-term use (i.e., a few days to several months) of herbal preparations containing valerian and Scutellaria (commonly called skullcap). Withdrawal after long-term use in a male has also been associated with benzodiazepine-like withdrawal symptoms, resulting in cardiac complications and delirium.
The very limited animal and human data do not allow a conclusion as to the safety of valerian during pregnancy. Moreover, as a natural, unregulated product, the concentration, contents, and presence of contaminants in valerian preparations cannot be easily determined. Because of this uncertainty and the potential for cytotoxicity in the fetus and hepatotoxicity in the mother, the product should be avoided during pregnancy.
Effect on other organisms
An unusual feature of valerian is that valerian root and leaves are a cat attractant similar to, and as safe as, catnip. Valerian contains the cat attractant actinidine. Cat attractants might mimic the odor of cat urine, which is caused by 3-mercapto-3-methylbutan-1-ol. Anecdotal reports claim that valerian is also attractive to rats—so much so that it had been used to bait traps. Stories describe the Pied Piper of Hamelin using both his pipes and valerian to attract rats. Research also shows that valerian root is the strongest chemoattractant of slime molds (Physarum polycephalum).
Valerian is unusual in having flowers with "handedness", that is, having neither radial nor bilateral symmetry.
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- Although many sources list "catinine" as an alkaloid present in extracts from the root of Valeriana officinalis, those sources are incorrect. The correct spelling is "chatinine". It was discovered by S. Waliszewski in 1891. See: S. Waliszewski (15 March 1891) L'Union pharmaceutique, page 109. Abstracts of this article appeared in: "Chatinine, alcaloïde de la racine de valériane" Répertoire de pharmacie, series 3, vol. 3, pp. 166–167 (April 10, 1891) ; American Journal of Pharmacy, vol. 66, p. 285 (June 1891).
- Isovaleramide does not appear to be a naturally occurring component of valerian plants; rather, it seems to be an artifact of the extraction process; specifically, it is produced by treating aqueous extracts of valerian with ammonia. See: Balandrin, M. F., Van Wagenen, B. C. and Cordell, G. A. (1995). "Valerian-derived sedative agents. II. Degradation of Valmane-derived valepotriates in ammoniated hydroalcoholic tinctures". Journal of Toxicology – Toxin Review 14 (2): 165 ff. doi:10.3109/15569549509097280.
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- Isovaleric acid does not appear to be a natural constituent of V. officinalis; rather, it is a breakdown product that is created during the extraction process or by enzymatic hydrolysis during (improper) storage. See pp. 22 and 123 of Peter J. Houghton, Valerian: the genus Valeriana (Amsterdam, the Netherlands: Harwood Academic Press, 1997) ISBN 90-5702-170-6.
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