Yes, red light therapy stimulates the hair follicle cells and causes hair to regrow. This therapy was beneficial in androgenic alopecia, alopecia areata, and chemo-induced alopecia. Hair regrowth is usually observed in the long term. Talk to your doctor again if you intend to use red light therapy long-term. Yes, red light therapy stimulates the hair follicle cells and causes hair to regrow. This therapy was beneficial in androgenic alopecia, alopecia areata, and chemo-induced alopecia. Hair regrowth is usually observed in the long term. Talk to your doctor again if you intend to use red light therapy long-term.