One cup in the morning is fine in my experience and i've heard many others say the same. The thing to worry about when it comes to Coffee is mainly that Caffeine is metabolized by CYP1A2 which is a liver enzyme that Harmalas inhibit, has really nothing to do with MAO-A inhibition, so with CYP1A2 inhibition the Caffeine will be potentiated quite a lot so a little Caffeine would go a long way, but that's if it's consumed with the Harmalas, so a cup of coffee early in the morning is no big deal, but ultimately it's up to you.