What is Biotin used for and how can I find it?

I hear now and then WLS people using Biotin. Where can I find it other and in the liquid multivitamin. The liquid multi-vitamin is the only source I have found thus far to have 100% of the RDA. Do I need it? I read something about it helping with hairloss?? But cant I get that assistance through folate(folic acid) and good protien intake????

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