Phase III contains this and other chemicals that will never allow it to be sold at real helf food stores. Mother Earth and Whole foods told me they would not carry this product due to its harmful chemicals.
You raised an interesting point, and I had to look it up. Cupric Sulfate has many, many uses, some seem nasty, others not at all. Just like putting sugar in your coffee, as opposed to coffee in your sugar, the usage and benefit is dependent upon the amount used in any given application. But the bottom line for our purposes is this:
There have been no reports of
toxicity in 50 years of the use of
copper sulfate at nutritional doses
in dietary supplements.
At nutritional doses copper is only
a beneficial nutrient.