dr. clarks ingrediants and where to get them

Hi, I need help on where to find certain things I cannot get at the grocery. I know ornithine can be picked up at GNC. But never heard of HCI. I also heard black wallnut is hard to find. What are the best options to go with and the easiest way's to get it? And how much if I plan on doing alot of fluches and is this expensive? The pink gratefruit and extra virgin olive oil, epsum salt, I can get at the grocery. I plan on starting as soon as possible.