A 2019 study published in Lasers in Medical Science found that a novel laser therapy helmet increased hair thickness and covered bald patches in men and women with androgenetic alopecia. ... However, laser caps and other non-surgical hair restoration methods can slow the progression of hair loss when used consistently.

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.

How long does it take to see results from a laser cap?

Results may vary from patient to patient. Because Capillus laser caps are designed to stimulate the hair follicle, most immediate biological changes occur within the skin and are invisible to the naked eye. Patients typically report seeing visual results within 2 to 4 months of regular treatment.