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L-glutamine is perhaps the most heavily prescribed supplement for intestinal permeability

Individuals using GLP-1 receptor agonists found significant reductions in protein, fiber, calcium, magnesium, iron, potassium, and several vitamins compared to dietary recommendations (Johnson, 2025)

This is known in functional medicine as the "NAC Paradox." While NAC provides the raw cysteine needed for the body to build its own glutathione, clinical observations indicate that NAC can act as a direct histamine liberator in sensitive individuals

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You may also see marginally cheaper, non-FDA-regulated compounded knock-offs