i haven't out any of the formula together yet, but yes, the black walnut TREE will be allot of the formula, each part of the tree has differant properties at differant times of the year and depending on how you extract these properties results in a good or not so good product. Over the years I have seen the results of each part, now this year I hope to combind what I have learned and add a few other herbs and make the ultimate potassium/iodine/mineral formula...DOG is getting a jump start over me.