A Probiotic Strain that Makes Antioxidants. Patented probiotic Lactobacillus fermentum ME-3 produces and recycles Glutathione, the "Master Antioxidant,” resulting in higher levels of active glutathione. Every cell in the human body uses glutathione to maintain cellular health. and it's absolutely vital to maintain a healthy immune system, support the health of cardiovascular tissue, and promote healthy liver function.