I m a minor (15) and well today i started taking 5mg (5000mcg) of biotin to make my hair grow & hair & nails stronger etc. however, when i took my first pill before dinner, i started feeling odd and my hands started shaking. alot. so much I had to lay down and didn t even get to eat. it calmed down after 30 minutes but, I still want to know why this happened. should I be concerned? Is it no big deal? Should i take a lower dosage? (I have NO medical problems, AT ALL.) I am very healthy diet, go to the gym regularly, I m perfectly normal. all i want is my hair to grow, please help.