I’m a 23 year old male, and my hair is thinning out some all around my scalp, and from what i’ve read in various forums, and through other sources here on the web, that losing the “juvenile hairline” is a common problem in men. I’ve looked around at people and i’ve noticed this is true. Male pattern baldness doesn’t run in my family, having thin hair, sorta fine hair does though in some men in my family, but so does really thick hair, more thick then thin. I’ve been using extra strength rogaine for about a week now, the 5% percent stuff, and i’ve read lots of good reviews on it. But there is one review that concerns me some, it’s from amazon.com. The review is here: Amazon.com – Warnings they don’t tell you about
I’m wondering if this is true, I’ve done some other research and could not find anything that says this other then this review. I still have a pretty good head of hair, is my existing hair going to fall out if I continue using this product? or will I grow back some of what I believe to be dorment hair?

I am unclear if you are even balding. A maturing hairline is not genetic balding and Rogaine (minoxidil) will likely not help you if a mature hairline is the extent of your loss. Minoxidil does not work in a few days or weeks. It takes a good year to work and will only work on some people who have lost hair, not everyone. Everybody reacts differently to medication, you have a very small chance you will regrow your dormant or juvenile hair in the frontal area. If you have naturally thin hair and no miniaturization, minoxidil will not have any value for you. If you are losing hair, then it might work for you. Just remember that after you stop it, you will lose the hair you grew.
Hair grown from Rogaine will never grow as long as your other hairs and most of the time that I have seen hair growth from Rogaine, it was smaller hairs that had less thickness to them. It is a lifelong commitment if you want to keep whatever benefits you received.