i was taking biotin 5000 mcg a couple of months ago,and i did notice an improvement on my hair and nails. the problem is though it caused me to have horrible cystic acne,so i stopped taking it. i want to try biotin again but i’m not sure what would be a safe dose to start off with. i also read you can take zinc to stop the cystic acne. how much biotin should i start off with and how much zinc should i take to balance it out?