According to Valkee’s accounts, side effects of the earlight include:
- abnormal sensation in the maxillary region
- irregular heartbeat
- orthostatic hypotension.
In their negative, unpublished placebo-controlled study, >28% of the users experienced unwanted effects. These are only the spontaneously reported events – an under-reporting inherent to industry-sponsored clinical trials. The real numbers are therefore unknown, but likely to be much higher.