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Tryptophan is a protein amino acid and is considered one of the essential amino acids, necessary to be taken from the outside, because we do not produce it ourselves. It forms many protein and peptide structures in our body. However, one property makes it a real star - it is a precursor of serotonin, the popular happiness hormone. HIGHEST PRODUCTION STANDARDS: The product was made in a HACCP certified facility using the best manufacturing practices. They ensure the highest quality of end products that are completely safe, effective and innovative. PRODUCT DIRECTLY FROM THE MANUFACTURER: MZ is a manufacturer of dietary supplements whose compositions are based on the latest scientific research results and many years of experience. Their task is not only to meet basic supplementation needs, but also to create market niches thanks to exclusive, rare products.