Hi there,
The loss of endothelial cells in FECD is believed to be possibly due to oxidative stress. Rehmannia is one plant that has been shown to have a strong antioxidant effect on the eye.
Formulas that might be applicable here include Xue Fu Zhu Yu Tang, Ming Mu Di Huang Wan, or Yi Guan Jian. All should be widely available. The former and the latter are available from
A Time to Heal Herbs on the US east coast. If no inflammation is present, then I'd probably suggest the Yi Guan Jian
Hopefully that helps you out! Please advise what happens
Steve