Valerian (Valeriana officinalis) is a perennial herb native to Europe and Asia. Its root has been used as a calming and sedative preparation since at least the 2nd century AD, when the Greek physician Galen prescribed it for insomnia. The herb was widely used in both World Wars to manage stress in civilian populations. Today it remains one of Europe's most popular herbal supplements and is approved as a traditional herbal medicine for mild anxiety and sleep difficulties in several European countries.
Active compounds
Valerian root contains a complex mixture of compounds, and its precise mechanism of action is still debated. The main candidates include:
- Valerenic acid and isovaleric acid: Sesquiterpene compounds unique to valerian species. Valerenic acid has been shown to modulate GABA-A receptors — the same receptors targeted by benzodiazepine drugs — through an allosteric mechanism, potentiating GABA signalling without directly binding to the benzodiazepine binding site.
- Isovaleric acid: Contributes to valerian's characteristic strong, musty odour and may have mild sedative properties.
- Valepotriates: Iridoid compounds found in fresh root that partially decompose during drying and storage. Their contribution to the pharmacological effects of dried preparations is uncertain.
- Glutamine: Present in valerian extract; can cross the blood-brain barrier and be converted to GABA.
GABA and the mechanism
GABA (gamma-aminobutyric acid) is the primary inhibitory neurotransmitter in the central nervous system. By enhancing GABAergic activity, valerian theoretically produces calming and sleep-promoting effects through a mechanism broadly analogous to (but much weaker than) benzodiazepines or Z-drugs like zolpidem — without the dependency risk associated with those pharmaceuticals.
Clinical evidence
Meta-analyses of valerian clinical trials show modest improvements in subjective sleep quality. A 2006 meta-analysis in the American Journal of Medicine reviewed 16 trials and concluded valerian may improve sleep quality without producing side effects. However, effect sizes were generally small and study quality was variable. Valerian appears most effective with consistent nightly use over 2–4 weeks rather than as a single acute dose.
Safety and form
Valerian is generally well-tolerated. It does not appear to cause morning grogginess at typical doses (300–600 mg of extract) and has a long safety record. Commercial supplements come as capsules of dried root extract (standardised to 0.8% valerenic acid), liquid tinctures, and teas. Standardised extracts provide more consistent dosing than unstandardised dried root.
Valerian root in Lebanon
Supplements & More carries valerian root capsules from US brands, available with cash on delivery across Lebanon.