Newbie, need advice/explanations for these supplements

What are the following supplements used for and in what doses?
Tongkat ali?
Vitamin B12?
Tribulus?
Vitamin B5?
Vitamin E?
Just wondering cause i see people talking about them all the time and the different dosages when they are on cycle, pct or off cycle completely and i just wanted to know what benefits they provide to the user?

Thanks for any help with this!

just do a search on each one and i'm sure u'll find more than enough info. always put the time in before you ask and then ask what u didnt figure out.

GO BEARS!!! who knows maybe they'll take the division w/ a sub par .500 record???