Cold sore triggers vary from person to person, but HSV is an opportunistic infection. That means it rears its ugly head when, for whatever reason, your immune system is too weak to Amazon.com: Integrative Therapeutics Glutathione Cell Defense Supplement with 400 mg Reduced Glutathione, L Cysteine, and Anthocyanins from Botanical Blend 60 Capsules : Health & Household HSV 1 induced N6 methyladenosine reprogramming via ICP0 mediated suppression of METTL14 potentiates oncolytic activity in glioma ScienceDirect TNF inhibits Epstein Barr virus reactivation through the GPX4 mediated glutathione pathway Scientific Reports TMEFF1 is a neuron specific restriction factor for herpes simplex virus Nature