Overview: Turmeric is a spice that comes from the underground stem (rhizome) of the plant Curcuma longa, a member of the ginger family. It is sold as an over-the-counter dietary supplement, most often ...

Research suggests that around 200 to 400 milligrams (mg) of L-theanine, an amino acid mainly found in green and black tea, may help manage anxiety and stress, but more research is necessary.