Placing a hair clip at the eyebrow level is said to quickly relieve headaches and cranial tension.

noli's read

This tip is based on the principle of acupressure, a method that targets specific points to relax areas of tension. Research, notably a systematic review published in the Journal of Traditional and Complementary Medicine (2014), suggests that stimulating points near the eyebrow (such as the Zanzhu point) can help soothe cranial discomfort. Furthermore, randomized controlled trials (RCTs) confirm that self-administered acupressure is effective at mitigating head tension over time. However, the specific use of a rigid hair clip has never been scientifically studied. The 'in a few seconds' relief effect is largely exaggerated, as these techniques generally require several minutes to take effect. Finally, uncalibrated mechanical pressure risks irritating the delicate skin of the face rather than relaxing it.

the sources

No named source held this one up — that absence is part of the verdict.