Valerian root also contains what are known as ‘iridoids’ including valepotriates. Studies suggest that these may also play a role in promoting sleep effects. Interestingly, valerian root also actually contains GABA in significant quantities, though it is unknown whether or not this GABA content is actually able to cross the blood-brain barrier and thus have any actual effect on our wakefulness (this also applies to GABA sold in other forms).
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