Not without medical supervision as there is a risk of serotonin sydrome. http://www.nlm.nih.gov/medlineplus/ency/article/007272.htm
Also be aware that 5-HTP is not going to do what Cymbalta (duloxetine) does. Despite the claims, antidpressants do not work by increasing serotonin in the brain. After the initial first few weeks they actually reduce both synthesis and overall brain levels. http://www.anxietyinsights.info/read/page/serotonin_chemical_imbalance_myth.htm
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