The thickness or luster of hair is dependent on which organ?

The thickness and luster of hair are primarily associated with the health and function of the liver. In Traditional Chinese Medicine (TCM), the liver plays a crucial role in the storage of blood and promoting the smooth flow of Qi (energy) throughout the body. Blood is essential for nourishing hair; therefore, a well-functioning liver ensures an adequate supply of blood, which contributes to healthy, thick, and shiny hair.

When there are deficiencies in liver function, it can lead to blood deficiency, which often manifests as symptoms such as brittle, thin, or dull hair. In TCM, the liver is also involved in the regulation of emotions, and stress can further impact liver health, potentially leading to hair problems. Overall, the liver's influence on blood quality and Qi flow directly correlates with the overall condition of hair.