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5-HTP is a naturally occurring amino acid that’s a precursor for the neurotransmitter serotonin, which supports a positive mood and outlook and may help to manage appetite. NOW 5-HTP Sustained Release (Amino SR™) Tablets allow for steady release and more gradual utilization of 5-HTP, and may be better tolerated by individuals who are sensitive to conventional 5-HTP supplements. This sustained release tablet is formulated for full release within 4 hours.