Q. I have a paper to write on questionable medicines through history, can you help me find some information?

Try

1.  New York Times Historical newspapers - offers historical articles on specific medicines (Lydia ... Pink... Snake oil... )
2. Wall Street Journal Historical Newspapers
 
3. Online, Nostrums and Quackery is a free e-book from 1921 
 
4. Bentley Library Catalog has good results if you search keywords quack medicine, health fads, remedies