Cant see why your worried about taking a caffeine pill, maybe its the fact that its in pill form, so why not just have an expresso instead
Coffee (and tea etc) are chock full of alkaloids, some of which are stimulating, some are good for you and some not. Coffee makes me feel quite rough if I have too much, but caffeine pills/gels, coke and red bull don’t. They also affect my heart much less.
I have found caffeine gels to be no different to normal gels in the first few hours of a ride, they are best saved for 3+ hours when you start to get knackered. Coke also works nicely then too 🙂