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however it is actually a vitamin-like nutrient, similar in structure to the B Vitamins

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Understanding Growth Hormone and Why It Matters Human growth hormone (GH) is produced by the pituitary gland and plays critical roles throughout the body in childhood and adolescence it drives physical growth, but its functions extend far beyond that

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The epithelium of gut uses different defense mechanisms against the microbiota such as immune response (innate or acquired), mucus layer secretion, as well as integrity and turnover of the epithelial cell (Bron et al., 2012)