I have some in my cupboard, but I do not take it regularly. It can help with sleep. However, messing with neurotransmitters is walking a fine line. If a person's serotonin is low it will boost it, but regular use will eventually make the user feel "weird" if they do not regularly require raises in serotonin to level out. In which case the individual might suffer from depression and should probably consult a doctor about an SSRI. At the opposite end, L-Tyrosine stimulates dopamine production and is found in pre-workout formulas. First time use results in feeling great, but it also gets old fast and the user will feel "weird" after a dose.
In my experience, supplements affecting neurotransmitters, and also adaptogens such as Ashwagandha and Rhodiola, is that if a person needs them because they are deficient then they can be great. I know Gunsmith mentioned Ashwagandha allowed him to cut his Paxil dose in half, which is awesome. However, taking the aforementioned supplements for a boost or edge in general, with no real necessity, can result in an imbalance that makes you feel mentally off.