On January 2007, the US Food & Drug Administration (FDA) approved the use of a LLLT device to stimulate and promote hair regrowth.
6 Clinical trials showed hair regrowth with an average hair count increase for all men and women was 93.5% success rate with an average of 19 new terminal hairs per square centimeter increase.
Additionally, the hair tensile strength also increased 78.9% when all temporal and vertex patients were considered.