synthetic - involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis; limnology is essentially a synthetic science composed of elements...that extend well beyond the limits of biology- P.S.Welch.
L-theanine is most effective in the range of 50-200 mg, with the effect being felt within 30 minutes and lasting for 8-10 hours. Individuals with high stress levels may increase their dosage of L-theanine to at least 100 mg, with no more than 600 mg being taken in a six hour period. FDA recommends a maximum dose of 1200 mg daily, although the reason for this limit is not clear, due to its demonstrated safety. There are no known adverse reactions to L-theanine and no drug interactions have been reported. L-theanine is not affected by food and may be taken anytime, as needed.
PRO. 1  L-theanine, a water-soluble amino acid, is found mainly in green and black tea, and to a lesser extent in mushrooms. 2  L-theanine has demonstrated benefit for patients diagnosed with anxiety by increasing levels of dopamine and GABA in the brain. 3  L-theanine is generally regarded as safe for adults in moderate amounts.-theanine should be used only under a doctorâs supervision if you are taking drugs for chemotherapy because it increases the activity of some cancer chemotherapeutic agents. Do not take L-theanine with cholesterol lowering medications. DOSAGE: 200 to 400 mg once or twice daily. (1200 maximum a day).