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I want to show you something about your gut that most physicians never explain. Your gut lining is a single cell layer thick. One cell. That's all that separates the contents of your digestive tract from your bloodstream. Those cells are connected by structures called tight junctions — think of them as the seals between tiles. When those seals are intact, only properly digested nutrients pass through into your blood. When they're compromised, larger particles — partially digested food, microbial fragments, toxins — slip through into the bloodstream where they don't belong. Here's the part that fascinates me as a physician: your gut lining cells turn over every 3-5 days. Your body is constantly rebuilding this barrier. That's actually good news, because it means the gut lining has a remarkable capacity to renew itself — IF it has the right building blocks. L-glutamine is the primary fuel source for intestinal epithelial cells. These cells consume more glutamine than almost any other cell type in your body. It's not a minor ingredient — it's the foundational nutrient for gut lining cell renewal. But fuel alone isn't enough. While new cells are forming, the existing lining needs protection. That's the role of the mucosal layer — a gel-like barrier produced by goblet cells that shields the gut wall from digestive acids and irritants. Botanicals like slippery elm bark and marshmallow root produce mucilage that supports and enhances this protective layer. I combined these ingredients — L-glutamine, slippery elm, marshmallow root, aloe vera, DGL, and prebiotic fiber — in specific therapeutic ratios because they address different aspects of gut barrier integrity simultaneously. I wrote a detailed piece explaining how this works. Link in comments.