While several subspecies of alisma (a.k.a. water-plantain), are found worldwide, all have similar medicinal uses.
The leaves can be used externally to treat bruises and swellings.
It is famous in TCM (Traditional Chinese Medicine) as a Yin Tonfying herb commonly added to preparations to improve Kidney balance and general health.
In Japan and China, the herb is often combined with antibiotics to treat kidney infections without negative interactions.
And, alisma can help support fertility.