What vitamin D drops are you using?

My little one is 2 months. The doctor told me to start using vitamin D. He sent a prescription to the pharmacy. I picked them up today and spend $17 on a tiny bottle. When I got home and looked at the ingredients, I noticed there are multiple oils, butterscotch flavoring and a few other things. I really do not want to give my baby drops with so many things added when I can give her a more natural option. Any ideas on simpler brands?