Caffeine is one of the most used substance all over the world. Ideally it should be consumed as less as possible. Find out Guillermo vs Caffe Americano caffeine content in the following sections. However Guillermo Caffeine levels and Caffe Americano Caffeine levels may differ with their brands, quantity of additives used, types of additives used etc. Below we have given you a generalized idea of safe levels of caffeine in Guillermo vs Caffe Americano, their side effects and benefits.