Question
Hello,
   I was having a problem with night vision and someone suggested taking Billberry.  I have been taking 2500 mg each day for a month and I can notice a good improvement.
   I also take sublingual B12 for my Pernicious Anemia and other vitamin supplements.
  My question is "For a month I have been having diarrea".  Can the Billberry be causing this and what should I do?

Answer
the best way to know for sure is to stop taking it for a week or two.  If your bowels go back to normal by the end of two weeks, then try the bilberry again and if you start having diarrhea again, then yes it's the bilberry.  If it is, you can lower your dose of it til you get to a point where you're no longer having diarrhea and that will be your limit on it.