Caffiene, the only reason so many students get their work in on time. Some sources of caffiene include ProPlus, coffee, sugar based carbonated drinks (Coca-cola et al) and a rather worringly large amount of chocolate bars.
Caffiene content.
- ProPlus - 50mg per tablet
- Can of Red Bull - 80mg
- Can of Pepsi Max - 55mg
- Can of Pepsi - 30mg
- Average chocolate bar - 15mg
The lethal dose of caffiene is around 75mg per kilogram body weight. Meaning the average American will find it virtually impossible to die from a lethal dose of caffiene.
http://www.erowid.org/chemicals/caffeine/caffeine_info1.shtml