The scalp and hair follicle tissue will absorb nutrition more sufficiently under the normal condition of metabolism, as a result it can promote the regeneration of hairs. Meanwhile, light can promote blood circulation, accelerate the access of nutrition into hair follicle tissue and promote the growth of hair by expediting the circulating process of the initial, interim and later period of hair growing.. Accelerating Blood Circulation Of Scalp And Promoting Metabolism: It can improve blood circulation with the effect up to 20~30% of forehead and even as high as 40~60% for the top of head, thus light can help boosting blood circulation, delivering oxygen and nutrition to hair follicle so as to achieve the efficacy of hair loss prevention.. Stimulating The Hair Follicle: It can effectively stimulate hair follicle to activate 83% of hair follicle in dormant