I have a fair bit of experience with modafinil/adronafinil, so if anyone has any questions, feel free to ask. I'm not recommending trying them without docter's prescription, of course.
It helped me greatly to stay up longer, to sleep less, and to concentrate better. However, those effects get much weaker over time: the sleep effects for me were less clear after 1-2 months, the concentration after weeks. Side effects can be nasty though, including limited appetite and gastrointestinal discomfort.
For the rest of the list: I've also tried various -racetam's, and they did nothing for me. Creatine, vitamin D don't have nootropic effects for me (but I still take them for other reasons). Caffeine is meh. Haven't tried the rest of the list.
It helped me greatly to stay up longer, to sleep less, and to concentrate better. However, those effects get much weaker over time: the sleep effects for me were less clear after 1-2 months, the concentration after weeks. Side effects can be nasty though, including limited appetite and gastrointestinal discomfort.
For the rest of the list: I've also tried various -racetam's, and they did nothing for me. Creatine, vitamin D don't have nootropic effects for me (but I still take them for other reasons). Caffeine is meh. Haven't tried the rest of the list.