Based on the research, Capillus claims that its low-level laser caps can reverse hair loss as well as increase hair counts. This can be done by just using the device for just six minutes a day. ... However, there is not enough evidence that any of these devices do hair restoration or even prevent balding.

Does Capillus hair treatment really work?

A company called Capillus claims that its low-level laser caps can effectively reverse hair loss while simultaneously increasing hair counts in just six minutes a day. There's very little evidence to support the efficacy of Capillus caps, and consumer reviews are less than stellar.

Do laser caps really regrow hair?

You may have heard that laser combs, brushes, hoods, and caps can help halt hair loss. The theory is that when hair follicles absorb laser light at a certain level, it stimulates hair to grow. But there's not enough evidence that any of these devices restore hair or prevent balding.