What can I do to make my hair thicker?

My hair is kinda thin and I was wondering if any one knows how I can make it look good or to make my hair thicker?

use NIOXIN, my sister is a GREAT hairstylist and she recommends it to people.

you can do like a zig zagish kinda part in your hair thats like preppish not like hardcore stuck to your head.
cause I do that all the time.
& then when you get out of the shower blow dry your hair upside down.
trust me it works.. cause I do it all the time & my hair isn't like real thick.

trust me you dont want thicker hair...I have thick hair and I hate it you cant do anything with it...well at least I cant...I would love to have thin hair...just trust me its horrible to have thick hair