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For a plain language primer, WebMD overview explaining what peptides are and how these short chains of amino acids function in the body is a helpful starting point

The management is directed to the underlying cause

Porphyrins and flavins as endogenous acceptors of optical radiation of blue spectral region determining photoinactivation of microbial cells

Oral microorganisms associated with periodontitis can enter the digestive tract, alter gut microbial composition, and subsequently promote depression-related behaviors through immune pathways

So in short, the gut affects both inflammation AND bacteria balance two major contributing factors known to trigger breakouts