Hungarian researcher Mester in 1967 found that 500 milliwatts, low power 694nm ruby laser increased hair growth on the backs of shaved mice. Low Level Laser Therapy (LLLT) has been used to reduce inflammation.
LLLT is proposed to act by stimulation of mitochondria to produce more ATP and Cyclic AMP with activation of response to oxidative stress, displacing NO (nitric oxide) out of the cells and allowing more oxygen to enter. Released NO also induces vasodilatation and improves blood flow to the hair roots. In our practice LLLT may not be advised alone but has benefit when used as adjunct to the medicines and also helps in post transplant cases.