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Thync is a startup funded by Khosla Ventures, selling an electronic wearable device it claims will improve mood.[1] Its makers claim the device works by neurostimulation techniques such as TENS and tDCS.
Some trial users feel no effect while others claim benefits.[2]
One evaluator compared it to drinking an espresso accompanied by a tingle of prickly heat behind the ear.[3]
The Food and Drug Administration has declined to classify it as a medical device under their purview.[3]