Because their dumb! They probably think that by having both you will have a faster reaction to it, and get the caffeine into the system faster, the problem with that is that for caffeine to be effective in the system it has to have a higher concentration level in the blood stream, and when you have a NO product as well, it opens up the blood flow and increase blood count, so it makes the concentration on caffeine less, hence not as effective, and the caffeine will be fighting with the NO in regards to the blood passage ways, one will try to open them and the other to close them.
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