It's basically a peel for your scalp -- the same type of peel-off Mask you use on your face to eliminate dirt, oils etc.
In theory, as long as you don't have a reaction to the igredients, then it should be benificial. I am actually quite interested in finding a list of the ingredients for Procede, because I'm pretty certain you may be able to find a similar facial product much cheaper, then just use it on your head.
Theoretically (again; I haven't used it), the peel should aid your hair loss fight by allowing an ultra clean surface on your scalp. Used in combination with Minoxidil, I believe you could get great results in regrowth.
I think their claim of hair growth is a little ambitious, because all it would be doing initially is removing dirt and oils, and also freeing hairs trapped by such.
It MAY aid actual regrowth too, but as a result of the cleanliness of your scalp; not by any special ingredient.
But if you were to use it once every 90 days, and use Minoxidil 5% twice a day, then I think the potential is there for greater results than on Minoxidil alone.
I may try it myself, but the $200 price tag (it would cost you $800 a year) is a little too steep for an experiment.