He Shou Wu is a commonly used herb for nourishing the liver and kidney, mainly for nourishing the yin of the liver and kidney, treating dry eyes and dry eyes caused by liver and kidney yin deficiency, including some people using He Shou Wu for hair. Black beans are also a tonic for kidney qi, so together with He Shou Wu they can nourish the kidneys. However, in recent years, it has been found that Radix Polygoni is known to cause liver damage to some people, especially raw Radix Polygoni, while Radix Polygoni is better. But this liver damage is individual, based on the fact that it is not known whether He Shou Wu causes liver damage, so the long-term application of He Shou Wu is not recommended. Because there are many herbs to nourish the liver and kidneys, not just He Shou Wu, and the effect of He Shou Wu on hair is very limited.