Fonti e risorse:
Koetter U: "A randomized, double blind, placebo-controlled, prospective clinical study to demonstrate clinical efficacy of a fixed valerian hops extract combination (Ze 91019) in patients suffering from non-organic sleep disorder".
Quera-Salva MA: "Melatonin: Physiological and pharmacological aspects related to sleep: The interest of a prolonged-release formulation (Circadin®) in insomnia".
Abourashed EA: "In vitro binding experiments with a Valerian, hops and their fixed combination extract (Ze91019) to selected central nervous system receptors".
Butterweck V: "Hypothermic effects of hops are antagonized with the competitive melatonin receptor antagonist luzindole in mice".
Javier Cubero Juanez: "Hops (Humulus lupulus L.) and Beer: Benefits on the Sleep".
Aaron Gardner: "Hops, your genetics, and the science of sleep" su mygenefood.com.