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doi: 10.1016/s0021-9673(02)01536-4

Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses

(2023a) demonstrated that high-altitude exposure increases gut permeability, decreases ileal immune function, and reduces both the richness and diversity of the ileal microbiota in mice

The time it takes to see results can vary depending on individual factors
