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.
In a double-blind, placebo controlled study, patients were treated with magnets applied to the skin.
The study used the rigorous double-blind method, and tested standard doses of Rescue Remedy against doses of a placebo.