Calctose is like Ovaltine, it's a chocolaty mix with added vits. Find big tins at Costco, find smaller ones in pretty much any grocery store (incl Wallymart and Soriana). It's usually in the coffee aisle, I think. Try cucumber, beets and carrots juiced together, that's a good mix imho. Nice if you add a bit of fresh ginger too. Also try putting lime juice in when you make carrot juice, it adds a nice twist. And you can always put a bit of spinach in your juice.
Dr Simi has similar products and you can check on line for what they sell that might fit your bill and RG's recipe!