Vitamins ??

Can anybody give me some suggestions on vitamins that I should start taking now. I'm thinking I will be having surgery in about two months but I want to start taking my vitamins now and maybe even help with my hair loss just in case it gets really bad after the surgery. What about prenatal vitamins has anybody taken them before surgery? 

Pre-op I was told to just take a multi.

I take Soloray, high energy, once a day.  Most people lose hair no matter what, to some degree.  I do take biotin, but I haven't heard of anything that definitely prevents hairloss during the high weight loss stage.  Best wishes on your new life!!! :) Congratulations!