balance scalp oil secretion to keep scalp health improve the quality of the hair although you should see obvious effect within 4 months, you can still use the product continuously according to the above instructions. irradiation time:20 minutes,2 times/per week tissue absorption of laser energy irradiation power * irradiation time. for the lpt laser power, the appropriate exposure time is critical. 4-18 weeks of oil secretion improved, and hair loss will be back to normal level.20 minutes is the suitable time to activate the hair follicle. 8-26 weeks, hair thicker , more comprehensive (full), more shiny (healthy).26-52 weeks, the hair comes into the full growth period, and hair volume increased significantly.syi