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Its job is to let the good things in (water and nutrients) and keep the bad things out (bacteria, toxins, and undigested food)

It is widely recognized that with aging, cell function, and metabolism are affected and the self-repair capacity of cells decreases [43]

Gut microbiota modulates neurological function in the brain through various pathways such as participation in immune regulation and neuroendocrine regulation (Xu et al., 2020), affecting patients cognitive function

11 Section S0, Non-Approved Substances, in WADAs classification system encompasses any compounds without approval by a governmental regulatory health authority for human therapeutic use, which would include all these injectable peptides