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The different amino acids have different functions: histidine has a vasodilating effect and lowers the blood pressure, arginine stimulates the secretion of growth hormone from the pituitary gland, lysine is involved in the collagen production process, tryptophan facilitates the production of some vitamins, glutamine improves the brain function, glutathione acts as an antioxidant and has an immunostimulating effect, etc

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Vitamin B12 injections typically result in increased energy, improved mood, and sharper cognitive functions