Is m-t-g REALLY that great?

i'm getting my horse a new halter and rain sheet, so i figured while i'm at it i should get some mtg. I've heard some great things about it, but HOW great is it? like, people will say, my horse's hair grew an inch in 3 months!….uh, yeah, my horse's did too…minus the MTG.

BUT, some darn horse grabbed hold of the fuzziest section on my horse, and ripped his hair out. it didn't damage his skin at all, he's just bald in an area. normally i wouldn't really care, but it's the size of my fist and really obvious. i'd like it to grow back. he also has a spot on his face where the hair was ripped out, but winter had just started and that never grew in either. oh, the joys of having a pasture horse! i have a feeling once spring comes and he sheds out he might start to grow hair, but better safe than sorry, you know?

SO, questions. how well does it grow back hair on bald skin? they aren't scars, just bald. is it safe to put on his face? i haven't really looked at the ingredients. my horse is horribly allergic to gnats, and last summer his poor little face went bald LOL. http://www.flickr0o0com/photos/21655830@N0… i'm assuming something like this might happen again this summer. i have a fly mask for him, but the gnats are awful. and finally, does it actually work on mane and tail growth? his tail used to be floor length, and i swear it's shrinking. his mane is nice, but i would like it longer.

thanks! any comments are welcome. i'd like to learn as much about it as i can.

oh, and is it worth it to spend the extra $10 for the quart (versus 6 oz)?