Caffeine is one of the most used substance all over the world. Ideally it should be consumed as less as possible. Find out Coffee Milk vs Doppio caffeine content in the following sections. However Coffee Milk Caffeine levels and Doppio 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 Coffee Milk vs Doppio, their side effects and benefits.