A double-blind, placebo-controlled trial of 128 volunteers showed that valerian significantly improved the sleep habits of self-described poor sleepers and insomniacs by effectively reducing sleep latency.
For acute hepatitis, double-blind trials have shown mixed results.
Systematic review The review used an extensive search strategy for randomized double blind studies comparing antidepressants with placebo, or with other drug treatments.
The study used the rigorous double-blind method, and tested standard doses of Rescue Remedy against doses of a placebo.
Although herbs like He Shou Wu have been used in traditional Chinese culture to support longevity and hair growth, folk usage does not carry the same weight as double-blind studies.