On the top, Click Forums ---> Search Forums ---> Use the lower fields to use search booleans. When I typed Vitamin C in those boxes instead of the default one on the site, I got better results. Probably just using vitamin as the main search and C as a letter in a word. Try maybe using " " or the word "and" in the different boxes once using the Google search curezone: "vitamin and C"

Play around and good luck.

Also, you can ask here with whatever questions you have about Vitamin C