Caffeine isn't the unhealthy drug some folks believe when it's taken in moderation. It's a natural, plant-sourced stimulant that even natives were consuming hundreds of years ago. But it does have some drawbacks when consumed by folks suffering from candida, high blood pressure, nervous disorders, etc.
But keep in mind the original comments: "...I'm trying to start my business. So, I can't be tired..."
If if comes down to needing moderate doses of caffiene to stay alert and function efficiently, or skipping same and not finding a good alternative, and eventually failing at work because of this, caffeine wins. Caffeine's effect on candida is certainly a relevant matter. But paying the mortgage or rent is even more relevant, especially if someone has experienced financial challenges. I'd suggest this concern has to be taken into account as well in this thread.