can some one explain why Hydroxiecut Hardcore says to not mix with other sources of caffine? is it just for thoses sensitive to caffine or what? thanks

Why are you using the product in the first place?

It's probably not a good idea to take a weight loss drug with any kind of warning label (including one that tells you not to mix it with anything else). But that's just my personal opinion. I'm into natural weight loss/gain.

To answer your question, if it says not to take it with caffeine, then don't take it with caffeine.

My guess would be that if you do, then you would be buying less Hydroxycut, and they don't want that.

Seriously, the only thing that will get "cut up" on that stuff is your income.