Even though research suggests that they have little negative long term side effects I do worry about taking them and would prefer a more natural method to get the same result.
Basically it's like this; If I get home from a 10 hour workday almost falling asleep, I can take one pill and suddenly it's like the day starts over again as my focus has returned. At the moment I feel like I need to do it as I have projects I work on in the evening that are important for my career progression.