One of these studies followed 128 volunteers and studied the effectiveness of 400mg valerian extract, a commercial preparation of 60mg valerian and 30mg of hips and a placebo on sleep.
“The extract resulted in a statistically significant improvement in time needed to fall asleep, sleep quality and less nighttime awakenings,” reports Holland and Barrett.
It is worth noting that other studies have found valerian extract did not impact sleep.
“To see improvement, people might have to take valerian root regularly, rather than once in a while or as needed,” says health body Sleep Foundation (SF).
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