well, i am going to have to go with Berardi on this one. the greens supplement i use and recommend is the same one he does (GREENS+ by genuine health), i was using it before he had it as part of his recommendations. he is also a shill for the company as he is for Biotest products. that alone speaks volumes.
as for the formula, it can definitely be made better, but the Greens+ in particular has quite a bit of research behind it, though i am unsure of any specifics regarding acid-base. no doubt that when a Biotest greens product comes out it will be top notch.
i would not expect a change in acidity as the body controls this tightly, however, the acid load felt by the kidneys will change and that has numerous ramifications with respect to the body’s mineral status. in general going towards a ‘basic’ diet means that you are taking in the correct amount of potassium and magnesium, something that most people fall disasterously short on while overconsuming sodium.
it is the change in the net acid load on the kidneys that determines whether you are acidic or not and being acidic is correlated with bone and muscle loss and deteriorating kidney function with age.
and yes, there is a varying level of products on the market just like any other supplement. some of the greens products are of astounding quality. they happen to be more expensive than most are willing to pay.