I believe I read somewhere here that 15% is a good place to start with the French Vanilla but I can't find it now. And I haven't found a starting place for the Holy V. Does anyone know a good place to start? I like my flavors to speak to me; I don't taste mild. I have decided these will be my first diy juices. I love the Shack's french vanilla. Thanks if anyone can give a suggestion. If not I think I will do French V at 15 and Holy V at 10 until I check them.