I've found this to be a good tip as I am doing get cold sores from having peanut butter and jelly sandwiches as time because of the argine making the other amino acids out of balance.
If I take l-lysine however I'll eat peanut butter moderately. A cold sore is from the hsv pathogen ( herpes simplex ). I can't say I have attempted this but have read that folk use this for chigger. This appears to be a good recommendation as l-lysine will suppress the argine and also be both a good preventive as well as help if you've an existing cold sore. * Put listerine on the cold sore each hour. I have not attempted this but it is dependent on the sensitiveness of your lip and its reply to alcohol. It is tough to test this as there isnt a concealed spot to try it on * Apply toothpaste and leave on overnite. Your lip is a delicate area and a cold sore can last 10 to 14 days.