Biotin 10,000mcg 7-3-2013: Started taking this high dose! We shall see the results in a few weeks!! UPDATE 9-27-13: I finished the bottle of 10,000. I noticed that my nails weakened. I didn't like that. I am back on 5,000 and measured my hair length, I'm at 10 inches. Back in July I was around 7.5 and 8. My hair feels stronger. I have also noticed that when I braid my hair, protective style, my braids are chunky. Before they would taper down.