Lysine is an amino acid. Amino acids are building blocks that help keep our bodies healthy. No specific link has been made with Lysine helping IBS, but if you’re suffering from other conditions such as canker sores or psoriasis along with IBS, it would be worth your time to try a Lysine supplement. I’d recommend NOW Foods Lysine capsules.
Disclaimer: I am not a medical professional. Using this information is at your own risk.