Valerian Root Lethal Dose. Valerian overdose, at approximately 20 times. The recommended dose was 1 tsp for 8 oz.
Valerian is derived from the valeriana plant, which is found in north america, europe, and asia. Valerenic acid is considered to be. 16 only 2 of the 16 studies stated that the valerian extract was standardized to a specific percentage of valerenic acids.