What is your opinion on l-theanine supplements? specifically for anxiety

Safe and effective : I have recommended l-theanine to hundreds of patients & find it safe & effective in reducing anxiety. However, i usually advise it in combination with other anti-anxiety agents like magnesium & holy basil (as theanine calming formula), so it's hard to assess how much of the benefit they get is purely from l-theanine. But studies show it is effective: http://www.Med.Nyu.Edu/content?Chunkiid=653856.