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gwern comments on Stupid Questions August 2015 - Less Wrong Discussion
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Could putting an 850 nm wavelength LED light array on my forehead for ten minutes or so a day do me any harm? It generates a small amount of heat.
Edit: See this video for a motivation: http://selfhacked.com/2015/07/18/interview-with-dr-michael-hamblin-harvard-professor-and-infrared-therapy-expert/
There are a few case studies/papers arguing it might help. It seemed to help one guy trying an RCT but the temporal patterns were weird. It didn't do me any harm; on the other hand, I didn't notice any benefit and the initial benefit seems to have been a selection/confounding effect since it disappeared after randomization.
I guess it depends on how much of your time/energy you think 10 minutes usage will cost you and if you think it's worth a shot.