I too take 1,000-2,000 mg l-lysine daily to control the cold sore/fever blister outbreaks that seem connected to BMS but I have not yet had shingles. I also have a supply of both 500 and 1,000 mg valtrex if l-lysine does not suffice. I was just tested for heavy metals and my system has a lot so will be detoxing - hoping this may lead to helping my burning mouth.