For those of you who have concerns about potential adverse effects of adding creatine to your diet, its pretty simple but I'll spend a few sentences covering this none the less. (besynchro.com)
Based on this review, they concluded that the general population of healthy adults is not at risk for potential adverse effects from caffeine if they limit their consumption to 400 mg per day. (australianbeverages.org)
Nevertheless, longer - term studies are necessary to determine potential adverse effects of such a diet, if any. (academic.oup.com)