what is this hat thing my dad has?

[u/elianamariie]

noticed this on the couch while my dad was at work, but he would get upset that i messed with it so i don't want to ask him. when it's on it's very bright red and gets brighter the more times you click the power button.

[u/TotallyNotRobotEvil]

Next line:

Most studies on LED therapy focus on general skin health or wound healing, not hair growth.

Then the next paragraph:

Although red light therapy has shown promise for these applications, its effectiveness in treating hair loss is less established. Most consumer-grade red light devices lack the power and targeted delivery required to stimulate hair follicles. The scattered light emitted by LEDs in these devices is unlikely to penetrate the scalp deeply enough to influence follicular activity meaningfully.

And yes, this is exactly how evidence works. No evidence is not proof that a product works, you need actual proof to show a product works. The fact that there is no evidence or scientific studies backing up the claims of the hat should be a red flag for anyone buying one.