DIY Juice for the first time here! :)

[Gitum]

Hello everyone! I am making some ejuices on my own and I have a few questions. I want to order from Perfumers Apprentice and I notice there are a lot of notes saying *** Note: This flavor contains 'custard' ingredients: Acetoin (not a Diketone) & Acetylpropionyl.

Does this mean that I should not be mixing with these flavors?

Thanks!