Lingzhi (Ganoderma lucidum), also known as reishi, is a medicinal mushroom widely used in Traditional Chinese Medicine (TCM). Its use is primarily justified by tradition rather than robust scientific evidence, particularly when it comes to supporting the "Hair" body system. In TCM, lingzhi is believed to nourish the "shen" (spirit) and support overall vitality, which may be interpreted as promoting healthy hair in the context of holistic well-being. Some traditional texts suggest that lingzhi can improve blood circulation, reduce stress, and support the liver and kidneys—organs that, according to TCM theory, influence hair growth and quality. However, these claims are rooted in traditional frameworks and not in modern biological science.

Scientifically, there is currently insufficient evidence to directly support the use of lingzhi for hair health. While lingzhi contains bioactive compounds such as polysaccharides, triterpenoids, and antioxidants that may have general health benefits, clinical studies specifically examining its effects on hair growth or prevention of hair loss are lacking. Some in vitro or animal studies suggest anti-inflammatory and immunomodulatory properties, but translation to human hair health is speculative. Therefore, lingzhi’s reputation as a hair-supporting agent arises from traditional use rather than validated scientific research.