The other 4 were added many years later to the original formula. They are 2 parts kelp, 1 part red clover, 0.4 part watercress and 1 part blessed thistle. These are good, but not necessary for the original 4 herb blend to work. I don't have any watercress at this time and I would have to find an organic, reputable supplier before I would feel comfortable adding it in. Good suppliers are hard to find!
I believe in sharing what knowledge I have - what good is it to keep it all to myself? Good thing I was not Colonel Sanders - or given the "Coca-Cola" recipe! LOL!