What is L glutathione? Rainbow Biotech Glutathione Wikipedia If your gas smells like sulfur and you react to glutathione, your high protein, low carb diet may not be helping you it's likely feeding the problem. In the distal colon, excess protein Glutathione: The Master Antioxidant Core Med Science At first, it's subtle. A little gas from NAC. A headache after glutathione. You think you're sensitive. Then it escalates histamine spikes, oxalate overload, neurological fog. What changed? Not the sulfur.