Youtheory Relax Powder is a fun, fizzy and flavorful way to supplement your magnesium, while offering a unique blend of powerful anti- nutrients: L-theanine and GABA. L-theanine is an amino acid found in green tea and is known to promote mental calmness without drowsiness. PharmaGABA® is the only natural-source GABA and is clinically shown to boost the production of alpha brain waves to help create a profound sense of physical relaxation.