Low energy fluence can stimulate growth of hairs. Exact mechanism of this action is not known. One theory suggests that increase in blood flow in dermal papilla may be cause of action.
Recommended treatment protocol includes 15-30 minutes treatment on alternative days for 2-4 weeks tapering to one to two treatment per week for 6-12 months, followed by biweekly and once per month maintenance treatment.
Low dose lasers are safe for treatment.