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Both amino acids 5-hydroxytryptophan (5-HTP) and l-tryptophan are precursors of serotonin. Because 5-HTP is more effective in crossing the blood-brain barrier, it is often recommended over l-tryptophan as a natural mood enhancer and sleep supplement. 5-HTP is also sometimes used as a natural anti anxiety supplement to promote healthy brain function and provide natural stress relief. 5-HTP can also be used as a natural alternative to sleep pills. * 5-HTP can provide a natural sleep aid for adults that can contribute to feeling rested and an overall feeling of wellness. These natural "brain pills" function as a serotonin supplement that could help you enjoy a new mood and new outlook on life! *