I've been on biotin in the past and I've started up on it again just this past couple of weeks. I think it does make your hair grow faster, at least that’s what people say, but it doesn't do anything in terms of preserving your hair. It can make you break out in spots, especially on your scalp. I've currently got a few, including one on my eyebrow. I'm not sure if this is a good sign or bad, but clearly something is happening. I got a bunch of 10,000 mcg which is split into fourths so I'm taking 2,500mcg a day.
I've also got MSM powder coming in the post. That's supposed to kick your resting hair into the anagen phase and promote growth. I also swallow a tiny drop of castor oil every day which is supposed to do the same thing. Well see.
I chose these supplements because I've just had the biggest shedding period I've ever had and I'm hoping to get some new growth because my hair looks like sh*t at the moment. I don't use minoxidil because I had a bad experience with it and I'm constantly looking for alternative ways to promote growth.
Honestly, a healthy diet and active lifestyle should really be all you need, staying away from foods that causes inflammation and making sure your getting enough fruit and veg. But we take supplements in the vague hope that there might be some key ingredient that's been missing from your usual hair loss regimen that might end up being the missing piece of the puzzle.
I disagree with all those supplement naysayers you see on these boards. They'll drop in on threads like this saying vitamins don't do sh*t for regrowing lost hair and then disappear just as quick. That may be true but there is something to be said for being healthy and keeping your body in the best condition possible so that if you ever do find something that works, weather it's anti-androgens of topicals, then at least your in the best physical condition to take advantage of it.