Do you add flavors and colors to milk pre or post pasteurization?

I have a question for producers of flavored milk: When adding flavors and colors to milk, do you add them pre or post pasteurization?

Hi Spidey; We produce flavoured yogurts. We add flavours differently, depending on customers' specs: we add vanilla extract before pasteurization, but, say, fruit preps (mango, strawberry) are added after pasteurization. I think that would depend on the nature of the flavour: if it's just an artificial one I think it could be added before pasteurizing, however if it's a natural fruit prep - that would be better added after pasteurization to save fruit characteristics.