Thync

Thync is a startup funded by Khosla Ventures, selling an electronic wearable device it claims will improve mood.{{cite web|last=Darrell|first=Larry|date=9 October 2014|publisher=Bidnessetc|url=http://www.bidnessetc.com/27041-thync-raises-13-million-in-funding-led-by-khosla-ventures-combines-neurosci|title=Thync Raises $13 Million In Funding Led By Khosla Ventures; Combines Neuroscience And Consumer Tech|url-status=dead|archiveurl=https://archive.today/20150216100142/http://www.bidnessetc.com/27041-thync-raises-13-million-in-funding-led-by-khosla-ventures-combines-neurosci|archivedate=16 February 2015}} Its makers claim the device works by neurostimulation techniques such as TENS and tDCS.

Some trial users feel no effect while others claim benefits.{{ cite web | publisher = Technology Review | title = The Electric Mood-Control Acid Test | author = Kevin Bullis | date = March 12, 2015 | url = http://www.technologyreview.com/featuredstory/535641/the-electric-mood-control-acid-test/ | accessdate = 2015-09-18 }}

One evaluator compared it to drinking an espresso accompanied by a tingle of prickly heat behind the ear.{{ cite web | publisher = Wall Street Journal | title = This Gadget Gives You a Low-Voltage Pick-Me-Up

| author = Geoffrey Fowler | date = July 21, 2015 | url = https://www.wsj.com/articles/this-gadget-gives-you-a-low-voltage-pick-me-up-1437503825 | accessdate = 2015-09-18 }}

The Food and Drug Administration has declined to classify it as a medical device under their purview.