Vitamin B (Biotin is a Vit B) , C and E are all water soluable. This means that your body will take what it needs and will urinate the excess out of your body.
I take a multivitamin and another pill containing Vit B6, B12, and folic acid.
I also have 2 omega 3 fatty acid tablets.
I have been taking all these for about a years and it has made a huge difference. My hair actually looks and feels healthy - it's about time lol