(Jia Xian Ding) This formula was created by Li Yan-ping in the 1990s in China.

Directions: Wet a cotton ball and tape over the affected nail. Leave in place for 20-30 minutes at a time. If possible, do two times per day. One can cover this application with a finger cot or finger stool (purchased at a local drugstore) so that the medicinal tincture does not drip or get on clothes or bedding. Must be used long-term and consistently to get the desired appearance. 

Ingredients:
Ku Shen (Radix Sophorae)
Da Huang (Radix Et Rhizoma Rhei)
Di Fu Zi (Fructus Kochiae)
Huang Bai (Cortex Phellodendri)
Tu Fu Ling (Rhizoma Smalcis)
Chi Shao (Radix Rubra Paeoniae)
Tu Bie Chong (Eupolyphaga/Steleophaga)
White vinegar