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gamma-Aminobutyric acid (GABA) is a major neurotransmitter used in the human central nervous system. As the body's most important and abundant inhibitory neurotransmitter, GABA acts to mitigate the overproduction of stimulatory neurotransmitters. Stimulation of GABA receptors leads to relaxation as well as to the induction and enhancement of sleep. ʟ‑Theanine is a known constituent of green tea and has been shown to cross the blood-brain barrier, leading to increased alpha wave activity, associated with relaxation responses via GABA-receptor stimulation. ʟ‑Theanine has been shown to mitigate cortisol production and mitigates carbohydrate cravings.