Coffee, tea or (caffeine) mints.
So, which of these have you popped or downed today?
These products all contain varying amounts of caffeine, alongside others you wouldn't have thought to contain it. Ice cream, frozen yogurt, breakfast cereals, pudding, pain medications … even cocoa butter lotion apparently all have it! 
Do you like most (or all) of these products? Then you must be wondering how much caffeine you take in daily.
We've got you covered.
Keep reading to find out the safe amount to consume and what might happen if you get too caffeine-happy.
Coffee before exams? Say you have a big mid-term or final exam coming up. You should power down big doses of caffeine in coffee or an energy drink, right? Not according to what we’ve read online. There are few formal, scientific studies about what to drink before exams, but the anecdotal evidence seems to point to water as the best beverage beforehand.
It’s important to get enough water so you don’t become fatigued from dehydration. That said, you can get some water from drinking coffee or energy drinks. Those old stories about coffee being a diuretic are true, but only if you drink so much that you get excess amounts of caffeine. Coffee and other caffeine-containing products are healthy for you when taken in moderate amounts, as we have written several times on this blog before.
Ten minutes after that first sip of coffee, the subtle but invigorating effects of caffeine kick in, making getting out there and facing the day seem less daunting.
And in a surprising finding, one study found that decaffeinated coffee, which contains only 2 to 3 percent of the caffeine of regular coffee, also contributes (slightly) to a person’s alertness.
We have good news for lovers of America’s two favorite mood-altering substances, caffeine and marijuana: Caffeine may enhance a pot smoker’s high.
The downside is that caffeine can also increase the chance of becoming addicted to cannabis.
Sages and philosophers from various world traditions have counseled “Everything in moderation,” and, stated another way, “Nothing in excess.” These aphorisms apply to caffeine, too, because too much of this otherwise beneficial chemical can cause insomnia, nervousness, muscle tremors and stomach upset.