Valerian extract comes from the root of Valeriana officinalis. Traditional use focuses on promoting calmness and restful sleep. The extract likely works by modulating GABA_A receptors and inhibiting GABA transaminase, not by raising total GABA levels.
Take it 30-60 minutes before bedtime. Some extracts are standardized to valerenic acid for consistent potency.
Valerian can cause drowsiness. Do not combine with alcohol or sedatives. Avoid during pregnancy and breastfeeding. Stop taking it before surgery to prevent excess sedation. Rarely, liver toxicity has been reported. Stop use and consult a doctor if you notice signs of liver trouble.