Recommend Vitamin B12 Supplements

I am a 19 year old girl and have a good number of white hairs. We started noticing the white hairs a year ago but now they are more abundant. I have asked my whole family and no one has had white hair this early. I think it may be connected to vitamin B12 deficiency because I had some symptoms of anemia before my gynecologist prescribed me birth control pills. I would rather have some form of treatment other than hair dye. I have looked up pills like Reminex, Melancor, and vitamin B12 supplements. What would you suggest I do?