My experience has been that the stronger my immune system has become (as a result of taking a high-quality arginine complexer formula), the fewer herpes/fever blister outbreaks... I used to have outbreaks several/many times a year (even though taking lysine on a daily basis), and ALWAYS had outbreaks when under stress. Since starting this arginine-based supplement over 5 years ago, I have had only ~3 minor outbreaks!
"... restricting dietary arginine is no longer considered to be an effective way to manage herpes. And, it may be deleterious for anyone with problems concerning nitric oxide production pathways (esp. those with hypertension)." ~