To cure ED is to solve the issue of no blood flow to your penis, lack of blood flow to the penis is what causes ED.
There is an enzyme called PDE5 that inhibits blood flow to the penis and thats what v1agra does to get you erections, it helps reduce this enyzme in your body
I am not recommending v1agra because it chemically composed and has many side effects but there is a plant based herb that performs the same function as v1agra but does it naturally