Can you point to any studies about the link between herpes and serotonin? That relationship would make some anecdotal sense to me. I really need to start taking the carrot salad again, I've got out of the habit, but for a lot of people it seems essential.
It's wrong. arginine promotes herpes virus replication by way of nitric oxide. In short, nitric oxide promotes herpes, not serotonin, and since lysine is a competitor of arginine uptake it prevents herpes breakout.