Short answer: L-Arginine may trigger outbreaks in people prone to herpes simplex. Avoid if you get cold sores regularly — a specific, less commonly discussed caution worth knowing.
Why this specific caution is genuinely useful information
This is a less obvious interaction most people wouldn't think to check — a direct, proactive disclosure rather than something you'd only discover after ordering.
Why this connects to arginine's broader biological role
Arginine is a nutrient the HSV-1 virus itself can use to replicate — a specific, checkable biological reason behind this caution, worth understanding if you're prone to outbreaks.
⚠️ Worth knowing: this caution appears alongside seven other specific medication and condition cautions in the formula's dedicated safety section.