Studio : Thompson Publisher : Thompson Binding : Health and Beauty Product Description L-5-hydroxytryptophan (5-HTP) is converted by the body to serotonin, which is a major neurotransmitter of the central nervous system. Our own laboratory analysis guarantees purity and freshness of all Thompson products. Not recommended for use with MAO-inhibiting antidepressant prescriptions. May cause drowsiness; do not use while driving or operating heavy machinery. 0
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