Does Liu Wei Di Huang Pill work for gray hair?

Liu Wei Di Huang Wan is useful for gray hair caused by kidney yin deficiency.
Liu Wei Di Huang Pill is a proprietary Chinese medicine that consists of Radix Rehmanniae Praeparata, Cornu Cervi Pantotrichum, Rhizoma Dioscoreae, Rhizoma Dioscoreae, Poria, and Zedoaria. It is able to nourish yin and tonify the kidney in terms of its efficacy. Therefore, it can be used to treat conditions such as lumbar and knee soreness, dizziness, tinnitus, seminal emission and night sweating (sweating abnormally after going to sleep and stopping after waking up), which are caused by deficiency of kidney yin.
The adverse reactions and contraindications of Liu Wei Di Huang Wan are not clear. It should be noted that the Six-flavored Dihuang Pill is forbidden for those who are allergic to it, and should not be taken by patients with fever and cold, and avoid indigestible food during the use of the drug.
Chinese medicine believes that gray hair may be related to kidney deficiency, liver depression and qi stagnation, etc. Liu Wei Di Huang Wan has the effect of treating kidney yin deficiency, so Liu Wei Di Huang Wan has a therapeutic effect on gray hair caused by kidney yin deficiency.
If you have a need for medication, you should use it under the guidance of a doctor and not blindly use it on your own to avoid adverse consequences.